U.S. Geological Survey 2016 1.0 vector digital data Open-File Report 2016-1168 Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20161168 http://pubs.usgs.gov/of/2016/1168/GIS_catalog/shapefile/2013-003-FA_512i_shot500.zip http://pubs.usgs.gov/of/2016/1168/ofr2016-1168-data_catalog.html Seth D. Ackerman Laura L. Brothers David S. Foster Brian D. Andrews Wayne E. Baldwin William C. Schwab 2016 1.0 Open-File Report 2016-1168 Reston, VA U.S. Geological Survey http://dx.doi.org/10.3133/ofr20161168 http://pubs.usgs.gov/of/2016/1168/ These data were collected under a cooperative agreement between the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of sea floor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters of coastal Massachusetts, primarily in water depths of 5 to 30 meters (m) deep. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (http://woodshole.er.usgs.gov/project-pages/coastal_mass/). The geophysical data were collected during a survey in 2013 during USGS Field Activity 2013-003-FA (http://cmgds.marine.usgs.gov/fan_info.php?fa=2013-003-FA) and cover approximately 185 square kilometers of the inner continental shelf. The seismic data associated with these navigation data are used to define the sea-floor morphology as part of the Massachusetts Seafloor Mapping Project. This dataset contains shotpoint navigation at a 500-shot interval for approximately 1920 km of EdgeTech SB-512i chirp seismic-reflection data collected south of Martha's Vineyard and north of Nantucket by the U.S. Geological Survey during Woods Hole Science Center cruise 2013-003-FA offshore of Massachusetts in 2013. (Esri point shapefile, Geographic, WGS84). 20130522 20130611 ground condition of survey dates: 20130522-20130611; see Completeness_Report for more information Complete None planned -70.805299 -70.034089 41.389004 41.195712 USGS Metadata Identifier USGS:eb000276-cb58-4f83-b046-35c7ca37df6f None U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Woods Hole Coastal and Marine Science Center WHCMSC Sea floor Marine Geology field activity 2013-003-FA field activity number 13003 USGS CMG InfoBank ID U-03-13-MA navigation shotpoint seismic navigation seismic reflection subbottom chirp EdgeTech 512i M/V Scarlett Isabella ISO 19115 Topic Category oceans location USGS Thesaurus navigational data marine geophysics geospatial datasets None North America United States Atlantic Ocean Massachusetts Marthas Vineyard Nantucket Nantucket Sound Cape Cod None Seafloor Sea floor Subsurface None 2013 None Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information. David Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2271 508-457-2310 dfoster@usgs.gov http://pubs.usgs.gov/of/2016/1168/GIS_catalog/browse_img/big/2013-003-FA_512i_shot500.jpg EdgeTech 512i 500 shotpoint navigation offshore of Massachusetts south of Marthas Vineyard and north of Nantucket JPEG Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095 Jack Cohen John Stockwell 2011 Golden, CO Center for Wave Phenomena - Colorado School of Mines http://www.cwp.mines.edu/cwpcodes/index.html Paul Henkart 2011 LaJolla, CA Scripps Institution of Oceanography, University of California - San Diego http://sioseis.ucsd.edu/index.html Michael W. Norris Alan K. Faichney 2002 Tulsa, OK Society of Exploration Geophysicists http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf Any spurious data points were removed during processing. No duplicate navigation fixes exist for the 500 shots shapefile. Results of the layback calculation are erratic along some survey lines where the survey speed was slower than normal or changed significantly, as well as instances of sudden and/or drastic heading changes, and especially when the heading was nearly due south and the back bearing (reciprocal of the heading crosses back and forth across the 0 and 360 degree boundary (e.g. line MV_tie2). For users who wish, pre-layback corrected shot navigation is provide in the “Old_East” and “Old_North” attributes of this 500 shot shapefile as well as the '2013-003-FA_512ishotunique.csv' file (included in this zip file). The navigation for lines L1-L13, which had to be taken from HYPACK navigation files due to the catamaran GPS technical difficulties described below, contain several fewer navigation fixes than shots that were recorded in the Seismic SEG-Y (and PNG images) because recording of the HYPACK navigation was stopped prior to stopping the seismic acquisition system. The remaining lines (L14 and later) used a DGPS system mounted on the acquisition van. These difficulties meant that all seismic navigation files had to be processed to account for the tow system layback. For the rest of the survey, the last shot point is reported to be 1 shot more than the range of shots shown in the seismic PNG image. This is due to a known glitch in the SIOSEIS software process ‘swell’, which erroneously causes the last two shots of the output SEGY file to be numbered the same. Sections of survey data where navigation was recorded but no seismic data were logged are not included. There is no line L47f1 (acquisition system froze 2 minutes into this line, no good data were recorded), there is also no line L132 and L133. Time gaps occurred during this field activity where no surveying was done due to bad weather, rough seas and stops in port for crew changes. Planned surveying was paused and no main survey line data were collected during these times: >JD143 15:20 - JD146 20:06 (no data were collected on JD144 or JD145) >JD149 15:40 - JD151 18:59 (no data were collected on JD150) >JD153 00:01 - JD153 14:32 >JD155 18:16 - JD156 02:06 >JD158 06:12 - JD160 19:15 (no data were collected on JD159) Field activity 2013-003-FA: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the M/V Scarlett Isabella. Position data were provided by a Global Positioning System (GPS) navigation receiver mounted on the catamaran for lines L1 - L13, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. Technical difficulties during portions of 2013-003-FA caused the GPS system mounted on the catamaran to malfunction, so DGPS navigation was obtained from a receiver mounted on top of the acquisition van. Layback positions, which account for the linear distance between the shipboard DGPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing. Positional accuracy is assumed to be +/- 20 m; increased uncertainty arises because layback calculations do not account for fish motion behind the vessel, which is caused by sea state and vessel speed induced changes in the angle and scope of the tow cable. U.S. Geological Survey Unpublished Material disc 20130522 20130611 ground condition of survey dates: 20130522-20130611; see Completeness_Report for more information none Seismic-reflection data acquisition 2013-003-FA: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz), which was mounted on a catamaran and towed astern of the M/V Scarlett Isabella of Cape May, NJ. Chesapeake Technologies' SonarWiz (v.5.03.0016) seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Data were acquired using a 0.25-s shot rate, a 5-ms pulse length, and a 0.5 to 8 kHz frequency sweep. Recorded trace lengths were approximately 100 ms (2170 samples/trace and .000046-s sample interval). SIOSEIS (version 2013.2) was used to read SEG-Y files, renumber shots starting from one, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data. In the same process, channel one (trace one, which is the envelope detected trace) within each shot was output to a text file. Channels two and three (raw data) were discarded. This process step and all subsequent process steps were performed by the same person - Wayne Baldwin. 2013 Wayne Baldwin U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd

Woods Hole MA 02543-1598 USA 508-548-8700 x2226 508-457-2310 wbaldwin@usgs.gov During the acquisition of lines 1 to 13, erroneous coordinates were intermittently recorded to the SEG-Y trace headers due to technical difficulties with the GPS system mounted on the catamaran vehicle. Scripts utilizing AWK (no version), Proj (version 4.6.0), and the Unix commands egrep, join, sort, and cat were used to replace coordinates in the text files created by the process described above with correct navigation from HYPACK raw files. The following steps were performed for each file: 1) navigation data were extracted from HYPACK raw files, creating a text file containing fields for Longitude, Latitude, and Julian day/UTC time (JD:HH:MM:SS); 2) records for the first and last shots, shots at multiples of 100, and the first record for each UTC second (files generally contain 4-5 shots per UTC second since the chirp shot rate is 4 Hz, while navigation update frequency is 1 Hz) were extracted from the original text files, and saved to new text files, only maintaining fields for LineName, ImageName, Shot, Year, and Julian day/UTC time (JD:HH:MM:SS); 3) files from the two previous steps were joined using the common field Julian day/UTC time (JD:HH:MM:SS); and 4) Geographic coordinates (WGS84) were converted to UTM zone 19 coordinates (WGS84) using Proj (version 4.6.0). The corrected navigation text files were substituted for the original data extracted from the SEG-Y trace headers. Beginning with Line 14, DGPS navigation was obtained from a Hemisphere receiver mounted on top, port side, forward end of the acquisition van. These coordinates were recorded in the SEG-Y source and receiver trace headers. Seismic Unix (version 4.2) was used to read renumbered SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude, latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files containing records for the first and last shots, and all shots in between with unique navigation coordinates. Geographic coordinates (WGS84) were converted to UTM zone 19 coordinates (WGS84) using Proj (version 4.6.0). 2013 A Python script was used to apply layback to all corrected (lines 1 to 13) and original (beginning with line 14) seismic navigation. Layback positions, which account for the linear distance of 48 meters between the shipboard DGPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing. A moving median filter was applied to azimuths used in the layback correction. A Proj command was used to convert the layback-corrected positions back into Geographic coordinates and an AWK script was used to save all of the unique shot point navigation and shot point files containing the start and end shots and shots at an even 500 shot interval. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images. The unique and 500-shot files contain attributes for the corrected shot position in both UTM and Geographic coordinates, as well as the original uncorrected (pre-layback) positions in UTM, date, time and other survey information. 2016 Text files containing the layback-adjusted navigation for each seismic line were concatenated into to comma-delimited text files. The file '2013-003-FA_512i_shotunique.csv', which is provided in the zip-compressed package of the 500-shot shapefile '2013-003-FA_512i_shot500.zip', contains the unique navigation, and the file '2013-003-FA_512i_shot500.csv contains the beginning, ending, and 500 shot interval positions. A Python script was used to import the CSV files into the SpatialLite (version 4.2.0_1) enabled SQLite (version 2.6) database. The geographic locations for each shot point were used to create point feature geometries in the SQL database. An Esri point shapefile for the 500-shotpoint intervals was exported directly from the SQLite database using the Geospatial Data Library (GDAL 2.0.1) ogr2ogr executable with the Spatialite option and an SQL query. 2016 USGS Thesaurus keywords added to the keyword section. 20180720 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Crossref DOI link was added as the first link in the metadata. 20191118 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Added keywords section with USGS persistent identifier as theme keyword. 20200908 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Point Entity point 6604 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 22013-003-FA_512i_shot500 Start, end, and 500 shotpoint interval positions for seismic profiles U.S. Geological Survey FID Internal feature number Esri Sequential unique whole numbers that are automatically generated Shape Feature geometry. Esri Coordinates defining the features East Easting coordinate in UTM Zone 19 meters, WGS84 U.S. Geological Survey 348813.43 413511.98 meters 0.01 North Northing coordinate in UTM Zone 19 meters, WGS84 U.S. Geological Survey 4562020.55 4582487.78 meters 0.01 Lon Longitude coordinate in decimal degrees, WGS84 U.S. Geological Survey -70.805299 -70.034089 decimal degrees 0.000001 Lat Latitude coordinate in decimal degrees, WGS84 U.S. Geological Survey 41.195712 41.389031 decimal degrees 0.000001 LineName Name of seismic data file U.S. Geological Survey String up to 80 characters ImageName Name of seismic profile image used as hyperlink U.S. Geological Survey String up to 80 characters Shot Name of seismicShot number (first, last, and every 500 shot between) U.S. Geological Survey 1 36800 shot number 1 Year Calendar year data were collected U.S. Geological Survey 2013 2013 Calendar year 1 DayUTC Julian day, UTC time of seismic shot (DAY:HH:MM:SS) U.S. Geological Survey String up to 80 characters OldEast pre-layback calculation Easting coordinate in UTM Zone 19 meters, WGS84. U.S. Geological Survey 348810.2 413469.51 meters 0.01 OldNorth pre-layback calculation Northing coordinate in UTM Zone 19 meters, WGS84 U.S. Geological Survey 4562067.01 4582458.65 meters 0.01 SurveyID WHCMSC field activity identifier in the new style (e.g. "2013-003-FA" where 2013 is the survey year, 003 is survey number of that year, and FA is Field Activity); Note the old style of this would be represented as "13003" USGS String up to 80 characters VehicleID Name of the survey vessel used for data collection USGS String up to 80 characters DeviceID Name of the sonar device used to collect seismic-reflection data USGS String up to 80 characters The PNG seismic reflection images can be hyperlinked to their trackline location in ArcGIS. The 500 shot point intervals correspond to the x-axis ticks on the PNG images. The unique shot CSV file has the following column headings: East, North, Lon[Longitude], Lat[Latitude], LineName, ImageName, Shot, Year, DayUTC, Old_East, Old_North, SurveyID, VehicleID, and DeviceID. These 14 columns correspond to the same 14 attributes of the shapefile. U.S. Geological Survey Seth Ackerman U.S. Geological Survey, Woods Hole Science Center Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543 USA 508-548-8700 x2315 sackerman@usgs.gov USGS data release 2013-003-FA seismic shotpoint navigation at a 500 shot interval (2013-003-FA_512i_shot500.shp; including first, last and every 500 shot between) from south of Martha's Vineyard and north of Nantucket. The zip file (2013-003-FA_512i_shot500.zip) contains a shapefile, the unique shot comma separated value file (2013-003-FA_512i_shotunique.csv) and metadata files in three standard formats. 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. SHP SpatiaLite point shapefile Zip file containing shotpoint navigation (at 500 shot interval) as well as unique shot navigation for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts in Esri Shapefile format. This also includes associated metadata. Use 7zip, WinZip, Peazip, pkUnzip, Keka or other uncompressing software 20 http://pubs.usgs.gov/of/2016/1168/GIS_catalog/shapefile/2013-003-FA_512i_shot500.zip http://pubs.usgs.gov/of/2016/1168/ofr2016-1168-data_catalog.html http://dx.doi.org/10.3133/ofr20161168 Data can be downloaded via the World Wide Web (WWW) CSV none Comma Separated Value Zip files contains the shotpoint navigation (all unique shot points) for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts in CSV format (2013-003-FA_512i_shotunique.csv). This also includes associated metadata. Use 7zip, WinZip, Peazip, pkUnzip, Keka or other uncompressing software 20 http://pubs.usgs.gov/of/2016/1168/GIS_catalog/shapefile/2013-003-FA_512i_shot500.zip http://pubs.usgs.gov/of/2016/1168/ofr2016-1168-data_catalog.html http://dx.doi.org/10.3133/ofr20161168 Data can be downloaded via the World Wide Web (WWW) none This zip file contains data available in Esri shapefile format. The zip file also contains associated metadata. The user must have software to read and process the data file. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com. 20240318 David Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2271 508-457-2310 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time