Seismic Reflection, Boomer profile images collected in the vicinity of Buffalo Reef, Michigan, within Lake Superior,during USGS field activity 2018-043-FA, (PNG Images)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20200318
Title:
Seismic Reflection, Boomer profile images collected in the vicinity of Buffalo Reef, Michigan, within Lake Superior,during USGS field activity 2018-043-FA, (PNG Images)
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9K4HX8V
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
Online_Linkage: https://doi.org/10.5066/P9K4HX8V
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Brian D. Andrews
Originator: Walter A. Barnhardt
Originator: David S. Foster
Originator: Barry J. Irwin
Originator: Alex R. Nichols
Publication_Date: 2020
Title:
High-resolution geophysical data collected in the vicinity of Buffalo Reef, Michigan, within Lake Superior, U.S. Geological Survey Field Activity 2018-043-FA
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9K4HX8V
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested citation:Andrews, B.D., Barnhardt, W.A., Foster, D.S., Irwin, B.J., and Nichols, A.R., 2020, High-resolution geophysical data collected in the vicinity of Buffalo Reef, Michigan, within Lake Superior, U.S. Geological Survey Field Activity 2018-043-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9K4HX8V
Online_Linkage: https://doi.org/10.5066/P9K4HX8V
Online_Linkage:
Description:
Abstract:
In September 2018, the USGS Woods Hole Coastal and Marine Science Center (WHCMSC), in collaboration with the US Army Corps of Engineers (USACE), conducted high-resolution geophysical mapping and sediment sampling to determine the distribution of historical mine tailings on the floor of Lake Superior. Large amounts of waste material from copper mining, locally known as “stamp sands”, were dumped into the lake in the early 20th century, with wide-reaching consequences that have continued into the present day. Mapping was focused offshore of the town of Gay on the Keweenaw Peninsula of Michigan, where ongoing erosion and re-deposition of the stamp sands has buried miles of native, white-sand beaches and is steadily encroaching south onto Buffalo Reef, a large area of cobble/boulder substrate that supports productive fisheries in the lake.
The objectives of this cooperative mapping project are to develop a framework for scientific research and provide baseline information required for management of resources within the coastal zone of northern Michigan. High resolution bathymetry and backscatter data reveal the irregular topography of the shallow, cobble-covered Buffalo Reef, and the relatively smooth, finer-grained sediment that covers adjacent, deeper parts of the lake floor. Previous research used numerous sediment samples to determine the general distribution of mine tailings on the lake floor in this area, but little information existed on the extent and thickness of the surficial deposits. The main priority of this project is to image the near-surface stratigraphy, specifically the surficial sand and mud that threaten to cover the reef, with seismic-reflection profiling systems. In addition to continuous coverage of bathymetric and backscatter data, this report includes a dense grid of closely spaced seismic profiles and an isopach map of sediment thickness, which will guide efforts to mitigate the impacts on Buffalo Reef from contamination by the shifting stamp sands.
Purpose:
These PNG images represent approximately 120.9 km of chirp seismic-reflection data collected by the U.S. Geological Survey during cruise 2018-043-FA along Traverse Bay, Lake Superior. This information allows for spatial correlation of boomer seismic-reflection profiles images with other geophysical and sample data for investigating lake-floor morphology and stratigraphy in the area. Images of each seismic profile were generated in order to provide portable and easily viewable alternatives to the SEGY versions of the data. Each profile image can be hotlinked to its corresponding trackline navigation contained within the Esri polyline shapefile '2018-043-FA_Edgetech424_Tracklines.shp'. Shotpoint index marks along the top of the PNG images correlate to the positions of 500 shot intervals within the Esri point shapefile '2018-043-FA_Boomer_500sht.shp'.
Supplemental_Information:
Additional information on the field activity is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-043-FA.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20180915
Ending_Date: 20180917
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.239672
East_Bounding_Coordinate: -88.126272
North_Bounding_Coordinate: 47.222706
South_Bounding_Coordinate: 47.14995
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5ddeacc0e4b04a30051b6eed
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: location
Theme_Keyword: geoscientificInformation
Theme_Keyword: inlandWaters
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: WHCMSC
Theme_Keyword: Department of the Interior
Theme_Keyword: DOI
Theme_Keyword: field activity number 2018-043-FA
Theme_Keyword: R/V Rafael
Theme_Keyword: PNG
Theme_Keyword: seismic profile
Theme_Keyword: boomer
Theme_Keyword: Applied Acoustics
Theme_Keyword: AA-251
Theme_Keyword: image
Theme_Keyword: PNG
Theme_Keyword: Lacustrine Geology
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: seismic reflection methods
Theme_Keyword: sub-bottom profiling
Theme_Keyword: geophysics
Theme_Keyword: geology
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States of America
Place_Keyword: State of Michigan
Place_Keyword: Keweenaw Peninsula
Place_Keyword: Keweenaw County
Place_Keyword: Houghton County
Place_Keyword: Lake Superior
Place_Keyword: Buffalo Reef
Place_Keyword: Traverse Bay
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: lake floor
Stratum_Keyword: lakefloor
Temporal:
Temporal_Keyword_Thesaurus: none
Temporal_Keyword: 2018
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely re-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_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: David S. Foster
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 x2271
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Thumbnail image of boomer seismic-reflection profile example from Lake Superior, Michigan.
Browse_Graphic_File_Type: JPEG
Data_Quality_Information:
Logical_Consistency_Report:
Processed seismic data were converted to PNG format for ease of seismic trace display. Quality control was conducted during processing.
Completeness_Report:
The boomer system was not deployed, and thus data were not collected after 9/17/2019 (JD260). Sections of tracklines where navigation was recorded but no seismic data were logged are not included such as SonarWiz acquisition failures, during testing, some turns, and very short files. Line files l13f1 and l13f2 were not processed because navigation was not available for these files.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The Applied Acoustics AA251 boomer plate was mounted to a catamaran and was towed from the starboard quarter of the R/V Rafael. The boomer plate was located approximately 0.25 meters below the water line, and 8.0 meters astern of the DGPS antenna mounted atop the port side of the cabin roof. Navigation data were collected using a Hemisphere Differential GPS (DGPS) receiver. Positioning data were recorded using Chesapeake Technology SonarWiz (v 7.00.0009) acquisition software, which logged positioning coordinates to individual trace headers SEG-Y format. DGPS horizontal positional accuracy is assumed to be within 2 m; the 8 meter layback position of the boomer plate relative to the DGPS antenna was accounted for during processing.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished Material
Title: Boomer PNG image data
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20180915
Ending_Date: 20180917
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: SEG-Y boomer data
Source_Contribution:
Boomer seismic-reflection data were collected using an Applied Acoustics AA-251 Boomer as a seismic source and a Benthos Aq-4 single-channel streamer. The AA-251 boomer plate mounted in a catamaran was towed on the lake surface from the starboard quarter of the R/V Rafael about 8 meters aft of the DGPS antenna. The receiver, a Benthos AQ-4 single-channel hydrophone streamer, was towed from a port side davit on the R/V Rafael at approximately 2 m below the water line. The AA-251 Boomer was power with an Applied Acoutics D-700 power supply, which was set to a 100 joules at low power. The active hydrophone section was approximately 14 meters aft of the DGPS antenna that was about 8 meters aft of the DGPS antenna mounted atop the port side of the cabin. The analog output from the streamer was connected to a Geopulse receiver which was used to apply a 150 to 5000 Hz bandpass filter and set a linear gain to 16 db in shallow water and 21 db in deeper water. The analog signal was output to a NI DAQ analog to digital converter. The digital signal was input to the acquisition computer where Chesapeake Technology SonarWiz (version 7.00.0009) seismic acquisition software was used to digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record DGPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 360000). Data were acquired using a 500 milliseconds (ms) shot rate. Traces were recorded with a 100-microsecond sample interval over lengths of approximately 200 ms (2000 samples per trace).
Process_Step:
Process_Description:
PROCESS STEP 1: SIOSEIS (version 2015.3.1), Seismic Unix (version 4.2), and Shearwater Reveal (version 2019) were used to process SEG-Y data, create navigation files, and plot images. The processing flow and scripts used to produce navigation files including trackline shapefiles are summarized below and in the following processing steps.
1) The Seismic Unix script readboomer was used to read the SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude and latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files containing shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 16 N coordinates (WGS 84) using Proj (version 4.9.3). An Esri shapefile was generated from the ascii shot navigation file with ArcCatalog (version 10.3.1) using Create Feature Class from XY Table. When the shapefile was added to an ArcMap project, observation of shot point locations showed uneven spacing. Even when the boat speed was relatively constant, shot spacing ranged from less than one meter to as much as five meters. This was likely due to the high rate (10 Hz) that the GPS was providing navigation strings to SonarWiz. Shot spacing would be anomalously short (less than one meter) for several shots and then jump ahead several meters. This may have been caused by a buffering and recording issues in SonarWIZ. The unique shot point navigation shape file was edited in ArcMap by graphically deleting anomalous shot points with distances from the last shot location was less than one meter. The first and last shot point locations were retained. The edited shapefile was exported to an ascii CSV file using XTools Pro (version 12) Table Operations, Export Table to File. This file was reformated to a SIOSEIS navigation file using and AWK (version 20070501) script.
2) SIOSEIS was used to read the raw SEG-Y files, insert edited shot point navigation that was created in the previous step into the SEG-Y trace headers with the process Geom (type 6), and then write new SEG-Y files with the edited navigation in the trace headers.
3) Shearwater Reveal was used to read the SEG-Y files containing edited navigation that used SegyTapeRead to read the trace and header data. HeaderMath and UTMLatLong were used to convert the source lat/lon positions from seconds of arc to decimal degrees, project them to UTM Zone 16N WGS 84 meters, and write each to new header words (NRP_LAT, NRP_LON, NRP_X, and NRP_Y). DBWrite wrote the UTM positions for the first channel of each FFID to an internal Reveal database table. Finally, Output wrote the traces to a new file "*.sht-raw.seis" in the internal OpenCPS format.
4) Shearwater Reveal was used to read the sht-raw.seis files and apply a top mute above the lake floor, apply a bandpass filter from 200 Hz to 2000 Hz, and apply a de-spike to remove high amplitude noise spikes created by the T20P multibeam. The processed file was saved as new file, *.proc.seis in the internal OpenCPS format.
5) Shearwater Reveal was used to read the "*.proc.seis" file. A custom Python module ShotlineLayback (developed by Nathan Miller of USGS-WHCMSC) was used to define the measured horizontal offset between the DGPS antenna and the boomer source (-8 m) and the horizontal offset from the DGPS antenna and the single-channel streamer (receiver). The algorithm interpolated a sail line from the source shot positions (NRP_X and NRP_Y), receiver positions (REC_X and REC_Y), and the midpoint locations (MPT_X and MPT_Y) locations between source and receiver locations. Then the computed layback positions for the midpoint locations were translated back along the sail line by the measured offset. Output wrote the shifted traces to a new SEG-Y files in which the trace header words SRC_X, SRC_Y represent the calculated layback coordinates, and REC_X, REC_Y maintain the original DGPS coordinates.
6) The Seismic Unix script readboomer was used to read layback corrected SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, pre-layback and layback longitude and latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files after an AWK (version 20070501) filter was used to maintain the first and last shots, shots at multiples of 100, 500, and shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 16 N coordinates (WGS 84) using Proj (version 4.9.3). End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images. A Python script BoomerinlbtoSQL2018043.py, written by Wayne Baldwin (USGS-WHCMSC), which imported the CSV files to a Spatialite (version 2.7) enabled SQLite (version 3) database, creating two tables containing point geometries for the unique and 500 shot interval navigation. The script also created line geometries from the unique navigation (sorted by LineName and Shot) and wrote them to an additional database table. The tracklines are based on all the shot navigation.
7) The Seismic Unix script Plot_boomer_layback reads the Seisnic Unix file created in the previous step and creates 12-inch-high variable density plots of the seismic profiles, which are converted to PNG format using ImageMagick (version 6.9.3-4). Images show two-way travel time (seconds) along the y-axis (left margin) and shots along profile (labeled at 500 shot intervals) on the x-axis (along top of profile).
These process steps and all subsequent process steps were conducted by the same person - David Foster.
Process_Date: 201909
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
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
Contact_Voice_Telephone: (508) 548-8700 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200807
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Changed the distribution format name from digital data to PNG to better represent the data. Changed the series issue from a URL to the DOI number.
Process_Date: 20210125
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The PNG seismic reflection images can be hyperlinked to their corresponding trackline or shotpoint locations in ArcGIS using the shapefiles '2018-043-FA_Boomer_Tracklines.shp' or '2018-043-FA_Boomer_500sht.shp', respectively (available from the larger work citation). The images show two-way travel time (seconds) on the y-axis and distance along profile (annotation at 500 shot intervals) on the x-axis.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical address
Address: Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
USGS data release 2018-043-FA boomer PNG imagery from Lake Superior, Michigan includes the zip archive 2018-043-FA_Boomer_Images.zip containing 24 PNG images named according to line convention, the browse graphic 2018-043-FA_Boomer_Images_browse.jpg, and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file 2018-043-FA_Boomer_Images_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. Any use of trade, product, or firm 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: PNG
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page.
Fees: none
Technical_Prerequisites:
These data can be viewed with any PNG image viewing software. The zip files must be uncompressed in order to view the images.
Metadata_Reference_Information:
Metadata_Date: 20210125
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: David S. Foster
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 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9K4HX8V/2018-043-FA_Boomer_Images_meta.html>
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