Metadata: Identification_Information: Citation: Citation_Information: Originator: Wayne E. Baldwin Originator: Nathaniel C. Miller Publication_Date: 20230721 Title: High-resolution multichannel seismic reflection data collected along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts, U.S. Geological Survey Field Activity 2016-018-FA Edition: 1 Geospatial_Data_Presentation_Form: Shapefile, CSV, PNG Image, SEG-Y Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9R3VW5H Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program Other_Citation_Details: Suggested citation: Baldwin, W.E. and Miller, N.C., 2023, High-resolution multichannel seismic reflection data collected along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts, U.S. Geological Survey Field Activity 2016-018-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9R3VW5H. Online_Linkage: https://doi.org/10.5066/P9R3VW5H Online_Linkage: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9R3VW5H/ Description: Abstract: High resolution multichannel seismic-reflection data were collected along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts, aboard the Woods Hole Oceanographic Institute (WHOI) research vessel Neil Armstrong on June 11 - 12, 2016 in order to characterize the stratigraphy of a portion of the New England continental margin incised by submarine canyons and showing evidence of mass transport processes. The activity was conducted as a part of the Science Verification Leg 5 (AR5) for the new vessel. Purpose: This dataset contains shot coordinate navigation, common mid-point (CMP) coordinate and trackline navigation, profile images, and processed stack and raw SEG-Y trace data for approximately 212 km of multichannel seismic-reflection data collected by the U.S. Geological Survey during USGS field activity 2016-018-FA along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts. Images of each seismic profile were generated in order to provide portable and easily viewable alternatives to the SEG-Y versions of the data. Each profile image can be hyperlinked to its corresponding trackline navigation contained within the Esri polyline shapefile '2016-008-FA_MCS_cmpTracklines.shp'. CMP tick marks along the top of the PNG images correlate to the positions of 500 CMP intervals within the Esri point shapefile '2016-018-FA_MCS_cmp500.shp'. This information allows for spatial correlation of MCS seismic-reflection profiles images with other geophysical data for investigating sea-floor morphology and stratigraphy in the area. Supplemental_Information: Additional information on the field activity associated with this project is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-018-FA and http://www.rvdata.us/catalog/AR5. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20160611 Ending_Date: 20160612 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.760014 East_Bounding_Coordinate: -69.510661 North_Bounding_Coordinate: 40.270350 South_Bounding_Coordinate: 39.617493 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:9f2b0b38-21f8-412f-882c-c942e2d52876 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: location Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Department of the Interior Theme_Keyword: DOI Theme_Keyword: Woods Hole Oceanographic Institution Theme_Keyword: WHOI Theme_Keyword: field activity number 2016-018-FA Theme_Keyword: AR5 Theme_Keyword: R/V Neil Armstrong Theme_Keyword: shapefile Theme_Keyword: trackline navigation Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: marine geophysics Theme_Keyword: marine geology Theme_Keyword: navigational data Theme_Keyword: navigation Theme_Keyword: SEG-Y traces Theme_Keyword: common mid-point stack Theme_Keyword: PNG Theme_Keyword: image Theme_Keyword: Delta Sparker Theme_Keyword: sparker Theme_Keyword: multi-channel streamer Theme_Keyword: Geometrics Theme_Keyword: GeoEel Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: seismic reflection methods Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics Theme_Keyword: marine geology Theme_Keyword: navigational data Theme_Keyword: geospatial datasets Place: Place_Keyword_Thesaurus: None Place_Keyword: United States of America Place_Keyword: Atlantic Ocean Place_Keyword: continental shelf Place_Keyword: New England Place_Keyword: Veatch Canyon Place_Keyword: Nantucket Canyon Place_Keyword: Atlantis Canyon Place_Keyword: Alvin Canyon Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: sea floor Stratum_Keyword: seafloor Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: 2016 Access_Constraints: none Use_Constraints: Public domain data from the U.S. Government are freely distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: Massachusetts Postal_Code: 02543-1598 Country: US Contact_Voice_Telephone: 508-548-8700 x2226 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/34a09e579dc04ef88769d302156d1bbb/2016-018-FA_MCS_cmpTracklines_browse.jpg Browse_Graphic_File_Description: Thumbnail image showing the extent of multichannel seismic-reflection profile data collected along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, during USGS Field Activity 2016-018-FA. Browse_Graphic_File_Type: JPEG Data_Set_Credit: The authors acknowledge our fellow participants of the multichannel seismic acquisition portion of field activity 2016-018-FA (AR5) Emile Bergeron, Tommy O'Brien, and Charles Worley of the U.S. Geological Survey and the crew of the R/V Neil Armstrong. Cross_Reference: Citation_Information: Originator: Norris, M.W. Originator: Faichney, A.K. Publication_Date: 2002 Title: SEG-Y rev. 1 Data Exchange Format - SEG Technical Standards Committee Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: Tulsa, OK Publisher: Society of Exploration Geophysicists Online_Linkage: https://library.seg.org/pb-assets/technical-standards/seg_y_rev1-1686080991247.pdf Data_Quality_Information: Logical_Consistency_Report: Quality control was conducted during processing to ensure consistency of stacked CMP SEG-Y data files with corresponding navigation ASCII CSV files, shapefiles and, seismic profile images. CMP numbers and navigation are consistent between corresponding survey lines in '2016-018-FA_MCS_StackSegyData.zip', 2016-018-FA_MCS_Images.zip', 2016-018-FA_MCS_cmp500.shp', '2016-018-FA_MCS_cmpnav.csv', and '2016-018-FA_MCS_cmpTracklines.shp'. The attribute fields 'LineName' and 'ImageName' for each polyline feature in '2016-018-FA_MCS_cmpTracklines.shp' correspond to the SEG-Y data files in '2016-018-FA_MCS_SegyData.zip' and the PNG profile images in '2016-018-FA_MCS_Images.zip', respectively. Completeness_Report: The shot navigation file '2016-018-FA_MCS_shotnav.csv' contains navigation coordinates for all shot records acquired during the survey. Every shot record may not contain active reflection data if the source was not being fired. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Multichannel seismic-reflection shots were primarily navigated using the R/V Neil Armstrong primary CNAV DGPS antenna as the navigational reference point (NRP). The NRP was 35.96 meters forward of the stern. The Delta sparker source was towed from the port quarter 50.96 m astern of the NRP, and the GeoEel streamer (452 m active section) was towed with the center of the first (channel 1) and last (channel 72) active groups trailing the NRP by 111.2 m and 557.3 m, respectively. The Geometrics CNT-1 seismic acquisition software (version 5.64) logged the shot navigation coordinates to the SEG-D external header. Processing descriptions provided below outline the procedures for calculating layback distances between the NRP, acoustic source, and receivers and the Common Midpoint (CMP) binning process. Although horizontal accuracy of WAAS enabled DGPS is estimated to be within 2-3 m, we assume the accuracy of the shot positions to be +/- 10 m due to layback offset between the NRP and far offsets of the receivers (there was no tail buoy with GPS) and movement of the source astern of the ship. Accuracy of CMP bin location is assumed to be coarser due to the additional uncertainty added from calculation of source/receiver layback and common mid-point positions. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unpublished Material Title: Raw MCS data Geospatial_Data_Presentation_Form: binary digital data Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20160611 Ending_Date: 20160612 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: MCS data Source_Contribution: Multichannel seismic-reflection data were shot using an Applied Acoustics Delta sparker powered by an Applied Acoustics CSP-D 2400 power supply that was set to a total power output of 2400 Joules. The Delta sparker has six sparker tips mounted to a surface floated sled that was towed 50.96 m astern of the NRP from the port quarter of the R/V Neil Armstrong. The source was triggered every 6 seconds (~ 11 to 14 m depending on ship speed) using the Geometrics CNT-1 software. Shots were recorded using a Geometrics GeoEel digital streamer composed of nine 50 m liquid filled active sections (a total of 72 channel groups with 6.25-m spacing) connected to a Geometrics Streamer Power Supply Unit (SPSU). The first and last active groups trailed the NRP by 111.2 m and 557.3 m, respectively. Geometrics CNT-1 seismic acquisition software (version 5.64) running on a Windows PC was used to control the multichannel system, digitally log traces in the Geometrics SEG-D format, and record shot NRP GPS navigation coordinates to the SEG-D external headers. Raw records were recorded over trace lengths of 5.5 seconds, with sample intervals of 0.5 milliseconds Process_Step: Process_Description: PROCESS STEP 1: Shearwater Reveal (version 2021) seismic processing software was used to execute the following processing flows to produce SEG-Y files containing raw shot gathers with header geometry and CMP stack files processed through trace noise reduction. (1.) Import SEG-D sequences: SegDRead read raw Geometrics SEG-D shot MCS files, extracted navigation fixes from the external headers, and wrote them to new header words, and converted the source lat/lon positions from seconds of arc to decimal degrees (NRP_LAT, NRP_LON). UTMLatLong projected the geographic navigation to UTM Zone 19N WGS 84 meters (NRP_X, and NRP_Y). Output wrote the trace sequence to Reveal formatted .seis files. (2.) Layback geometry assignment: Input read trace files sorted by FFID/CHANNEL. The Python module ShotlineLayback (developed by Nathan Miller of USGS-WHCMSC) defined the source and streamer geometry based on measured horizontal offsets from the navigation reference point (NRP) to the center of the source (COS) and the centers of the first and last 6.25 m spaced channel groups. The following lists the linear offsets from the NRP to COS and index channels (IC) used to define layback geometry. NRP to COS, NRP to IC offset(IC#): for 72 channel streamer -50.962(0),-111.2(1)/-557.3(72). The module interpolated a sail line from the shot NRP positions (NRP_X and NRP_Y), then computed layback positions for the source and channel groups (values were interpolated for all channels in between the defined index channels) for each FFID by translating them back along the sail line by their respective offsets. Layback mid-point positions along the sail line were computed for each shot/receiver pair, CMP bin spacing was set to 6.25 m, the first CMP to 1000, and CMP coordinates (BIN_X and BIN_Y) were computed. HeaderMath computed and populated a new header word for trace offset using OFFSET = ABS(NRP2CHAN) - ABS(NRP2COS). Output wrote the trace sequence with defined geometry (offset and CMP) to new files. DBWrite wrote the layback geometry source positions (in UTM 19N WGS84 meters and geographic decimal degrees), FFID number, year, day number, and UTC times for the shots in each merged line to ASCII CSV files. Output wrote the lines to new seis files as well as SEG-Y Rev. 1 format (32-Bit IEEE floating point). Each output SEG-Y file contains a textural file header similar to the example from 2016-018-FA_Line-01.sgy included below. Example shot gather SEG-Y Textural File Header: U.S. Geological Survey Coastal and Marine Hazards and Resources Program Field Activity 2016-018-FA - Southern New England Shelf Edge - R/V Neil Armstrong Shot gathers with header geometry of 2016-018-FA_Line-01 Acquisition: Applied Acoustics Delta Sparker source (2.4 kilojoules), 6 second shot interval, 72 channel GeoEel hydrophone streamer (6.25 meter groups), 0.5 millisecond sample interval, 5.5 second record lengths, recorded in SEG-D format. Processing: SEG-D import, assign SRC/REC/Midpoint layback geometry relative to NRP navigation, assign CMPs, top mute (above 5 ms, with 60 ms taper), apply Butterworth highpass filter (60 Hz minimum frequency). Output: 32-bit IEEE floating point SEG-Y, 5.5 second record length. SRC/GRP/CMP coordinate are stored in geographic arcseconds (scaled by 100). Divide by 360000 for decimal degrees. Coordinate scalar in bytes 71-72. SRC-X and SRC-Y in bytes 73-76 AND 77-80. GRP-X and GRP-Y in bytes 81-84 AND 85-88. CMP-X and CMP-Y in bytes 181-184 AND 185-188. CMP number stored in bytes 21-24. For additional information on this dataset refer to the associated USGS data release at: https://doi.org/10.5056/P9R3VW5H (3.) Trace Noise Reduction: Input read trace files with assigned geometry sorted to FFID/CHANNEL. Detrend removed any mean amplitude trend detected from each trace. A Butterworth bandpass filter (80 - 600 Hz) was applied to the traces. SphericalDivergence scaled traces using an offset dependent correction. A polygonal FKFilter rejected noise energy identified in shot gather f-k spectra. Output wrote preprocessed, noise-reduced traces to new files. (4.) Constant velocity CMP stack and SEG-Y output: Input read the geometry corrected and noise-reduced trace files sorted to CMP / OFFSET. NormalMoveout converted traces to zero offset using a constant velocity of 1500 m/s, and Stack produced a single trace per CMP bin. Output wrote the stacked traces to new seis files. HeaderMath converted the geographic coordinates from decimal degrees to seconds of arc multiplied by a scaler of 100, and set the coordinate unit header to 2 accordingly. DBWrite wrote the CMP positions (in UTM 19N WGS84 meters and geographic decimal degrees), CMP number and year to ASCII CSV text files by line. Output wrote the stacked traces to SEG-Y Rev. 1 format (32-Bit IEEE floating point). Each output SEG-Y file contains a textural file header similar to the example from 2016-018-FA_Line-01.sgy included below. Example stack SEG-Y Textural File Header: U.S. Geological Survey Coastal and Marine Hazards and Resources Program Field Activity 2016-018-FA - Southern New England Shelf Edge - R/V Neil Armstrong Preliminary CMP stack of 2016-018-FA_Line-01 through noise reduction processing. Acquisition: Applied Acoustics Delta Sparker source (2.4 kilojoules), 6 second shot interval, 72 channel GeoEel hydrophone streamer (6.25 meter groups), 0.5 millisecond sample interval, 5.5 second record lengths, recorded in SEG-D format. Processing: SEG-D import, assign SRC/REC/Midpoint layback geometry relative NRP navigation, assign CMPs, apply Butterworth bandpass filter (80-600 Hz), trace edits, SphericalDivergence scaled traces using an offset dependent correction, FK filtering, normal moveout correction (constant 1500 m/s velocity) ,stack. Output: 32-bit IEEE floating point SEG-Y, 5.5 second record length. CMP coordinates are stored in geographic arcseconds (scaled by 100). Divide by 360000 for decimal degrees. Coordinate scalar in bytes 71-72. CMP-X and CMP-Y in bytes 181-184 and 185-188. CMP number stored in bytes 21-24. For additional information on this dataset refer to the associated USGS data release at: https://doi.org/10.5056/P9R3VW5H These process steps and all subsequent process steps were conducted by Wayne Baldwin. Process_Date: 2023 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: Massachusetts Postal_Code: 02543-1598 Country: US Contact_Voice_Telephone: 508-548-8700 x2226 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: PROCESS STEP 2: NAVIGATION PROCESSING AND FEATURE CLASS GENERATION: A python Jupyter notebook utilized the python modules pandas (version 1.5.2), geopandas (version 0.12.1), pyproj (version 3.4.0), numpy (version 1.23.5), shapely (version 1.8.5.post1), and sqlite3 (version 3.40.0) to process the layback source and CMP navigation data for each profile line in the following steps. (1.) Layback source csv navigation files were imported to a pandas dataframe. UTM Zone 19 North (WGS84) coordinates were converted to Geographic coordinates (WGS84) using PyProj Transformer and written to new dataframe columns. A subset of the dataframe consisting of values for easting and northing, latitude and longitude, profile line name, shot, UTC date/time, as well as new fields populated for profile image name, survey ID, vehicle ID, and device ID was generated. Geopandas and shapely were used to create a point geometry column from the geographic coordinates. SQL queries were used to load the layback source navigation dataframe into a table in a geospatial SQLite database using the pyspatialite interface. (2.) CMP bin csv navigation files were also imported to a pandas dataframe. UTM Zone 19 North (WGS84) coordinates were converted to Geographic coordinates (WGS84) using PyProj Transformer and written to new dataframe columns. A subset of the dataframe consisting of values for easting and northing, latitude and longitude, profile line name, CMP, UTC date/time, as well as new fields populated for profile image name, survey ID, vehicle ID, and device ID was generated. Geopandas and shapely were used to create a point geometry column from the geographic coordinates. SQL queries were used to load the shot navigation dataframe into three separate tables in the geospatial SQLite database using the pyspatialite interface. The first containing all CMP navigation, the second maintaining the first and last shots and even 500 shot intervals (which correspond to the annotation interval provided along the top of the seismic-reflection profile images), and the third containing trackline features created from the navigation point geometries. (2.) The 500 CMP and CMP trackline tables were imported into QGIS (version 3.28.2) from the SQLite database, then exported (Right click on database feature class > Data > Save Features As) to the new Esri point and polyline shapefiles '2016-018-FA_MCS_cmp500.shp' and '2016-018-FA_MCS_Tracklines.shp', respectively. The tables containing all csv and layback source navigation were also imported into QGIS, then exported as the csv files '2016-018-FA_MCS_cmpnav.csv' and '2016-018-FA_MCS_shtnav.csv', respectively. Process_Date: 2023 Process_Step: Process_Description: PROCESS STEP 4: PROFILE BROWSE IMAGE PRODUCTION The Seismic Unix (version 4.4) script 'plot_geomet' was used to read the stacked SEG-Y files and create variable density greyscale Postscript plots (using the Seismic Unix 'psimage' module) showing two-way travel time (seconds) along the y-axis (left margin) and CMP along profile (labeled at 500 CMP intervals) on the x-axis (along top of profile). The Postscript images were then converted to 150 dpi PNG formatted images using ImageMagick convert (version 6.9.11-60). The output PNG files were named according to filename convention. Process_Date: 2023 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: WGS 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_cmpTracklines.shp Entity_Type_Definition: MCS CMP Trackline shapefile for survey 2016-018-FA (4 polyline features). Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: LineName Attribute_Definition: Name of the trackline along which seismic-reflection data were collected in the format: SurveyID_LineName (e.g., '2016-018-FA_Line-01'). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ImageName Attribute_Definition: PNG image name of seismic-reflection profile corresponding to survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: CMP_init Attribute_Definition: CMP number at the start of the survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1005 Range_Domain_Maximum: 1006 Attribute_Units_of_Measure: CMP Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: CMP_end Attribute_Definition: CMP number at the end of the survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3919 Range_Domain_Maximum: 14459 Attribute_Units_of_Measure: CMP Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: SurveyID Attribute_Definition: WHCMSC field activity identifier (e.g., "2016-018-FA" where 2016 is the survey year, 018 is survey number of that year, and FA is Field Activity). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: VehicleID Attribute_Definition: Survey vessel name. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: DeviceID Attribute_Definition: Device used to collect seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: Length_km Attribute_Definition: Length of CMP seismic-reflection data line in kilometers (UTM Zone 19N, WGS 84) calculated in the SQLite database. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18.218 Range_Domain_Maximum: 84.099 Attribute_Units_of_Measure: kilometers Attribute_Measurement_Resolution: 0.01 Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_cmp500.shp Entity_Type_Definition: MCS 500-interval CMP point shapefile for survey 2016-018-FA (73 point features). Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: East Attribute_Definition: Easting coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 349682.43 Range_Domain_Maximum: 456142.34 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: North Attribute_Definition: Northing coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4385506.78 Range_Domain_Maximum: 4458106.70 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: Lon Attribute_Definition: Longitude coordinate in decimal degrees, WGS 84 (negative indicates west longitude) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.759629 Range_Domain_Maximum: -69.510963 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: Lat Attribute_Definition: Latitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 39.618196 Range_Domain_Maximum: 40.269466 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: LineName Attribute_Definition: Name of the trackline along which seismic-reflection data were collected in the format: SurveyID_LineName (e.g., '2016-018-FA_Line-01'). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ImageName Attribute_Definition: PNG image name of seismic-reflection profile corresponding to survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: CMP Attribute_Definition: CMP number. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1005 Range_Domain_Maximum: 14459 Attribute_Units_of_Measure: CMP Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: SurveyID Attribute_Definition: WHCMSC field activity identifier (e.g., "2016-018-FA" where 2016 is the survey year, 018 is survey number of that year, and FA is Field Activity). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: VehicleID Attribute_Definition: Survey vessel name. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: DeviceID Attribute_Definition: Device used to collect seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_cmpnav.csv Entity_Type_Definition: MCS CMP comma separated values file for survey 2016-018-FA (33844 point features). Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: East Attribute_Definition: Easting coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 349682.43 Range_Domain_Maximum: 456142.34 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: North Attribute_Definition: Northing coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4385506.78 Range_Domain_Maximum: 4458201.5 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: Lon Attribute_Definition: Longitude coordinate in decimal degrees, WGS 84 (negative indicates west longitude) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.759629 Range_Domain_Maximum: -69.510963 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: Lat Attribute_Definition: Latitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 39.618196 Range_Domain_Maximum: 40.27035 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: LineName Attribute_Definition: Name of the trackline along which seismic-reflection data were collected in the format: SurveyID_LineName (e.g., '2016-018-FA_Line-01'). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ImageName Attribute_Definition: PNG image name of seismic-reflection profile corresponding to survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: CMP Attribute_Definition: CMP number. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1005 Range_Domain_Maximum: 14459 Attribute_Units_of_Measure: CMP Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: SurveyID Attribute_Definition: WHCMSC field activity identifier (e.g., "2016-018-FA" where 2016 is the survey year, 018 is survey number of that year, and FA is Field Activity). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: VehicleID Attribute_Definition: Survey vessel name. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: DeviceID Attribute_Definition: Device used to collect seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_shotnav.csv Entity_Type_Definition: MCS shot point comma separated values file for survey 2016-018-FA (16972 point features). Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: East Attribute_Definition: Easting coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 349649.57 Range_Domain_Maximum: 456167.74 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: North Attribute_Definition: Northing coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4385428.61 Range_Domain_Maximum: 4458201.5 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: Lon Attribute_Definition: Longitude coordinate in decimal degrees, WGS 84 (negative indicates west longitude) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.760014 Range_Domain_Maximum: -69.510661 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: Lat Attribute_Definition: Latitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 39.617493 Range_Domain_Maximum: 40.27035 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: LineName Attribute_Definition: Name of the trackline along which seismic-reflection data were collected in the format: SurveyID_LineName (e.g., '2016-018-FA_Line-01'). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: FFID Attribute_Definition: Shot number. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 6744 Attribute_Units_of_Measure: shot Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Date Attribute_Definition: Calendar date the data were collected in the format MM/DD/YYYY. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: UTC_DT Attribute_Definition: Year, Julian day, and UTC time of the navigation fix in the format: YYYY:JD:HH:MM:SS; Julian day is the integer number (although recorded here in text string format) representing the interval of time in days since January 1 of the year of collection. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: SurveyID Attribute_Definition: WHCMSC field activity identifier (e.g., "2016-018-FA" where 2016 is the survey year, 018 is survey number of that year, and FA is Field Activity). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: VehicleID Attribute_Definition: Survey vessel name. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: DeviceID Attribute_Definition: Device used to collect seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_Images.zip Entity_Type_Definition: Portable network graphic images of MCS profiles processed through trace noise reduction and stack for survey 2016-018-FA (4 PNG images). Entity_Type_Definition_Source: U.S. Geological Survey Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_MCS_StackSegyData.zip Entity_Type_Definition: Binary SEG-Y format files of MCS profiles processed through trace noise reduction and stack for survey 2016-018-FA (4 SEG-Y files). Entity_Type_Definition_Source: U.S. Geological Survey Detailed_Description: Entity_Type: Entity_Type_Label: 2016-018-FA_Line-*.sht-raw_geom.sgy.zip Entity_Type_Definition: Binary SEG-Y format files of MCS profiles processed through application of trace header geometry for survey 2016-018-FA (4 SEG-Y files). Entity_Type_Definition_Source: U.S. Geological Survey Overview_Description: Entity_and_Attribute_Overview: The PNG seismic reflection images can be hyperlinked to their corresponding trackline or CMP locations in a GIS using the shapefiles '2016-018-FA_MCS_cmpTracklines.shp' or '2016-018-FA_MCS_cmp500.shp', respectively. The images illustrate distance along the profile on the x-axis (annotation at 500 shot intervals) and two-way travel time (seconds) on the y-axis. The CMP point features (including first, last, and multiples of 500) in '2016-018-FA_MCS_cmp500.shp' correspond to the x-axis tick marks. Two binary SEG-Y files (Norris and Faichney, 2002) are provided for each survey line, one containing pre-stack shot gathers and the other CMP traces processed through stack. A SEG-Y file consists of 1) a 3200-byte textural file header containing general information (see examples following processing steps); 2) a 400-byte binary record with information such as sample rate and record length specific to the data set; and 3) multiple records, with one (stack) or more (shot gathers) seismic reflection traces per record. Each trace record is preceded by a 240-byte "trace header" containing information such as trace number and acquisition day and time specific to each trace. The trace data are represented as a time series of unitless 32-bit real numbers proportional to the pressure recorded at each hydrophone. The SEG-Y file is useful only if you have access to specialized software designed to process and display seismic reflection data. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2226 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Resource_Description: USGS data release of multichannel seismic-reflection data collected using a Delta sparker source and Geometrics GeoEel digital streamer during USGS field activity 2016-018-FA includes: the zip archive '2016-018-FA_MCS_Shapefiles.zip' which includes '2016-018-FA_MCS_cmp500.shp' containing the first, last and 500-interval CMP locations, '2016-018-FA_MCS_cmpTracklines.shp' containing trackline features, and the browse graphic '2016-018-FA_MCS_cmpTracklines_browse.jpg'; the zip archive '2016-018-FA_MCS_cmpnav.csv.zip' containing all CMP locations; the zip archive '2016-018-FA_MCS_shotnav.csv.zip' containing all shot point locations; the zip archives '2016-018-FA_Line-01.sht-raw_geom.sgy.zip', '2016-018-FA_Line-02.sht-raw_geom.sgy.zip', '2016-018-FA_Line-03.sht-raw_geom.sgy.zip', and '2016-018-FA_Line-04.sht-raw_geom.sgy.zip' containing pre-stack shot gather traces in 4 binary SEG-Y files ('*.sgy'); the zip archive '2016-018-FA_MCS_StackSegyData.zip containing stacked CMP traces in 4 binary SEG-Y files ('*.sgy'); '2016-018-FA_MCS_Images.zip' containing 4 CMP stack profile PNG images; and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file 2016-018-FA_MCS_meta.xml. Distribution_Liability: Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), and have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: QGIS 3.28.2 Format_Specification: Shapefile Format_Information_Content: Zip compressed folder "2016-018-FA_MCS_Shapefiles.zip" containing shapefiles of MCS CMP trackline and point (first, last and 500-interval) navigation features collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. File_Decompression_Technique: Use any zip decompression utility to uncompress the image folder. GIS software is needed to read the shapefile format. Transfer_Size: 0.341 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/2f870d5d18dd42c896f55fa7d0e71a13/2016-018-FA_MCS_Shapefiles.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9R3VW5H/ Network_Resource_Name: https://doi.org/10.5066/P9R3VW5H Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of shapefile data shapefiles of MCS CMP trackline and point navigation. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: CSV Format_Version_Number: None Format_Specification: Comma-Separated Values (CSV) Format_Information_Content: Zip compressed folder "2016-018-FA_MCS_cmpnav.csv.zip" containing CSV files of MCS CMP navigation collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. Zip compressed folder "2016-018-FA_MCS_shotnav.csv.zip" containing CSV files of MCS shot navigation collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. File_Decompression_Technique: Use any zip decompression utility to uncompress the image folder. The CSV file can be viewed with any text editor or spreadsheet software. Transfer_Size: 1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/0ba4c305c6794bb394e66263cbf3e3f9/2016-018-FA_MCS_cmpnav.csv.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/dad8ee00e2cc447894a443ca32865cdc/2016-018-FA_MCS_shtnav.csv.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9R3VW5H/ Network_Resource_Name: https://doi.org/10.5066/P9R3VW5H Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of CSV files of MCS CMP navigation data. The second link is a direct link to download the zipped file of CSV files of MCS shot navigation The third and fourth links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: PNG Format_Version_Number: ImageMagick (version 6.9.11-60) Format_Specification: Portable Network Graphic (PNG) Format_Information_Content: Zip compressed folder '2016-018-FA_MCS_Images.zip' containing MCS seismic reflection profile images collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. File_Decompression_Technique: Use any zip decompression utility to uncompress the image folder. The PNG files can be viewed with any image viewing software. Transfer_Size: 63.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/6618acbcb6ed41e1a4c18593f2931a3a/2016-018-FA_MCS_Images.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9R3VW5H/ Network_Resource_Name: https://doi.org/10.5066/P9R3VW5H Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: SEG-Y Rev 1 Format_Specification: SEG-Y Format_Information_Content: Zip compressed files '2016-018-FA_Line-01.sht-raw_geom.sgy.zip' (13.9 GB), '2016-018-FA_Line-02.sht-raw_geom.sgy.zip' (4.1 GB), '2016-018-FA_Line-03.sht-raw_geom.sgy.zip' (10.2), and '2016-018-FA_Line-04.sht-raw_geom.sgy.zip' (18.6 GB) containing shot gather seismic reflection trace data with header geometry collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. Additionally, zip compressed folder "2016-018-FA_MCS_StackSegyData.zip" (1.3 GB) containing processed MCS seismic reflection trace data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the New England outer continental shelf, slope, and rise south of Martha's Vineyard and Nantucket, Massachusetts during USGS Field Activity 2016-018-FA. File_Decompression_Technique: Use any zip decompression utility to uncompress the image folder. The binary SEG-Y files can be viewed with appropriate seismic viewing or processing software. Transfer_Size: 48100 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/f1e81789c7ea4c1ead0fedd8f0a3158b/2016-018-FA_Line-01.sht-raw_geom.sgy.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/d88feaae5670489da5b8591317be907f/2016-018-FA_Line-02.sht-raw_geom.sgy.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/3bc5ffe34bf94c48ba73ab879757194e/2016-018-FA_Line-03.sht-raw_geom.sgy.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/bf4898fa4d994fe8a54742fcfacf8e65/2016-018-FA_Line-04.sht-raw_geom.sgy.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2023/10.5066-P9R3VW5H/54bfe08ec308444fb5d1efe6fd7d0f97/2016-018-FA_MCS_StackSegyData.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9R3VW5H/ Network_Resource_Name: https://doi.org/10.5066/P9R3VW5H Access_Instructions: The data can be downloaded using the Network Resource Name links. The first four links are direct links to the zipped data files of containing shot gather seismic reflection trace data with header geometry for download. The fifth link is a direct link to download the zipped file containing processed MCS seismic reflection trace data. The last two links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Fees: none Technical_Prerequisites: To utilize these data, the user must have software capable of reading shapefiles, CSV files, PNG images, and/or SEG-Y seismic trace files. Metadata_Reference_Information: Metadata_Date: 20230721 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Wayne Baldwin Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with the USGS. Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time