U.S. Geological Survey 2010 1.0 raster digital data Open-File Report 2009-1072 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20091072 https://pubs.usgs.gov/of/2009/1072/GIS/hyperlink_images/DH_SeismicProfiles.zip https://pubs.usgs.gov/of/2009/1072/html/appendix1.html Walter A. Barnhardt Seth D. Ackerman Brian D. Andrews Wayne E. Baldwin 2010 1.0 raster digital data Open-File Report 2009-1072 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2009/1072/ These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Science Center (WHSC). 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 (5-30 m deep) of Massachusetts between the New Hampshire border and Cape Cod Bay. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (https://woodshole.er.usgs.gov/project-pages/coastal_mass/). This spatial dataset is from the study area located between Duxbury and Hull Massachusetts, and consists of high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection) and ground validation (sediment samples, video tracklines and bottom photographs). The data were collected during four separate surveys conducted between 2003 and 2007 (NOAA survey H10993 in 2003, USGS-WHSC survey 06012 in 2006, and USGS-WHSC surveys 07001 and 07003 in 2007) and cover more than 200 square kilometers of the inner continental shelf. JPEG images of each seismic profile were generated in order to incorporate images of the seismic profiles into Geographic Information System (GIS) projects and data archives utilizing HTML. The JPEG images represent approximately 1920 km of EdgeTech SB-512i SB-424 chirp seismic-reflection profiles collected within the Duxbury to Hull survey area. Each profile image is hotlinked to its corresponding trackline navigation contained within the ESRI polyline shapefile 'DH_SeismicTracklines.shp'. Even 500 shot index markers along the top of the JPEG images correlate to the positions of 500 shot intervals within the ESRI point shapefile 'DH_SeismicShot_500.shp'. 20060804 20070502 ground condition of two separate surveys. The dates for the surveys were 20060804 to 20060820 and 20070422 to 20070502. Complete None planned -70.828283 -70.595687 42.339977 42.080213 USGS Metadata Identifier USGS:672100e7-9a3c-46b0-aa39-a2bc05c983f8 None U.S. Geological Survey USGS Woods Hole Science Center WHSC Coastal and Marine Geology Program CMGP Seafloor Marine Geology JPEG seismic reflection SEGY seismic profile subbottom EdgeTech 512i 424 image chirp R/V Megan T. Miller R/V Rafael WHSC field activity serial number 06012 WHSC field activity serial number 07001 ISO 19115 Topic Category geoscientificInformation oceans USGS Thesaurus sub-bottom profiling image collections marine geophysics None North America United States Atlantic Ocean Massachusetts Boston South Shore Massachusetts Bay Cape Cod Bay Nantasket Beach Hull Bay Scituate Marshfield Brant Rock Duxbury Beach Duxbury Bay 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. Wayne Baldwin U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 508-548-8700 x2226 508-457-2310 wbaldwin@usgs.gov https://pubs.usgs.gov/of/2009/1072/GIS/browse_jpg/big/DH_SeismicReflectionProfiles.jpg JPEG image of a chirp seismic-reflection profile JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500 John Stockwell 2008 Golden, CO Center for Wave Phenomena - Colorado School of Mines http://www.cwp.mines.edu/cwpcodes/index.html Paul Henkart 2007 LaJolla, CA Scripps Institution of Oceanography, University of California - San Diego http://sioseis.ucsd.edu/index.html Michael W. Norris and Alan K. Faichney 2002 Tulsa, OK Society of Exploration Geophysicists http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf Walter A. Barnhardt Brian D. Andrews Bradford Butman 2006 Open-File Report 2005-1293 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2005/1293/ Seth D. Ackerman Bradford Butman Walter A. Barnhardt William W. Danforth James M. Crocker 2006 Open-File Report 2006-1008 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2006/1008/ Walter A. Barnhardt Brian D. Andrews Seth D. Ackerman Wayne E. Baldwin Christopher J. Hein 2009 Open-File Report 2007-1373 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2007/1373/ Processed seismic data were converted to JPEG format for ease of seismic trace display. Quality control was conducted during processing. Only the subsets of seismic-reflection data collected during field activities 06012 and 07001 that are within the study area between Duxbury and Hull have been included in this raster dataset. Approximately 945 km of additional seismic-reflection profiles collected south of Brant Rock, Massachusetts during these field activities will be published in a subsequent data release focused on Cape Cod Bay. Field activity 06012: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the R/V Megan T. Miller. Position data were provided by a Global Positioning System (GPS) navigation receiver mounted on the catamaran, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. During some portions of the survey, technical difficulties caused the GPS system mounted on the catamaran to malfunction. In these instances Real Time Kinematic (RTK) GPS navigation was obtained from a receiver mounted above the interferometric sonar head (This applies to files l25f2000 through l84f2000 acquired during Julian days 218 through 222). Layback positions, which account for the linear distance between the shipboard RTK-GPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing (see processing step 3). While the vehicle mounted GPS antenna was operational, positional accuracy is assumed to be ± 10 m. While the vehicle mounted GPS was not operational, 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. Field activity 07001: The SB-424 was mounted on a rigid pole, approximately 1 m below the sea surface on the starboard side of the R/V Rafael. Position data were provided by a RTK-GPS navigation receiver mounted directly above the interferometric sonar head. While horizontal offsets between the SB-424 transducer and the RTK-GPS navigation receiver were not corrected in the sonar setup, this distance was less than 3 m, and the resulting positional accuracy is assumed to be ± 10 m. USGS (assumed) unknown Information unavailable from original metadata. 20060804 20070502 ground condition of two separate surveys. The dates for the surveys were 20060804 to 20060820 and 20070422 to 20070502. Information unavailable from original metadata. Seismic-reflection data acquisition 06012: 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 R/V Megan T. Miller of Port Jefferson, NY. EdgeTech J-Star seismic acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the EdgeTech JSF format. Data were acquired using a 0.25-s shot rate, a 9-ms pulse length, and a 0.5 to 6 kHz frequency sweep. Recorded trace lengths were approximately 266 ms. Tracklines were spaced between 100 and 200 m apart in the shore parallel direction and between 1 and 3 km apart in the shore perpendicular direction. Seismic-reflection data acquisition 07001: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-424 towfish (4-24 kHz), which was mounted on a rigid pole on the starboard side of the R/V Rafael of Woods Hole, MA. EdgeTech J-Star and Triton Imaging Inc. SB-Logger seismic acquisition software was used to control the Geo-Star topside unit and digitally log trace data in EdgeTech JSF and SEG-Y Rev. 1 formats, respectively. Data were acquired using a 0.25-s shot rate, a 10-ms pulse length, and a 4 to 16 kHz frequency sweep. Recorded trace lengths were approximately 250 ms. Tracklines were spaced 100 m apart in the shore parallel direction and between 200 m and 2 km apart in the shore perpendicular direction. A script was run that used SIOSEIS (version 2007.8) to predict and remove sea surface heave, and mute water column portions of SB-512i and SB-424 seismic traces by: 1)automatically picking the sea floor by identifying peak amplitudes within a vertical window; 2)smoothing sea floor picks using an along track filter approximating the period of sea surface heave (the filter window was set to use 46 traces); 3)creating a series of difference values between the raw and smoothed seafloor picks for each trace; 4)shifting traces up or down according to the difference values; and 5) muting each trace between time zero and the time of the smoothed sea floor pick, thus removing noise within the water column. Changes to the traces within each profile were saved to new "heave corrected" SEG-Y files, which were used for creation of JPEG browse images and digital interpretation. 200810 Wayne Baldwin U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 508-548-8700 x2226 508-457-2310 wbaldwin@usgs.gov An AWK (no version) script was run that used Seismic Unix (version 4.1) to read the SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm. All images were created with a horizontal scale of 200 traces per inch. The profiles contain 80 milliseconds of Two-Way Travel Time within an 8-inch vertical window, yielding 10 milliseconds per inch. Postscript images were converted to JPEG format using ImageMagick (version 5.5.6). 200810 Wayne Baldwin U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 508-548-8700 x2226 508-457-2310 wbaldwin@usgs.gov JPEG images were resized to enable quicker and easier downloading for online users of the Open-File Report using IrfanView (v4.23). The original JPEG images (found in the folders by survey ID in GIS\hyperlink_images\seisimage\) were resized to 75 percent the original pixel size and downsampled with a save quality of 80 percent. These downsampled and resized images are included in the zipped file DH_SeismicProfiles.zip (https://pubs.usgs.gov/of/2009/1072/html/appendix1.html). Full sized JPEG images 200908 Downsampled and resized JPEG images (same filenames) Seth Ackerman U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2315 508-457-2310 sackerman@usgs.gov Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Attempted to modify http to https where appropriate. Fixed a link to the project page in the abstract. Fixed an online link in a cross-reference. The source information was incomplete and had to be modified to meet the standard. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. 20170202 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 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 Raster pixel Wayne Baldwin 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 x2226 wbaldwin@usgs.gov Downloadable Data 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. JPEG unknown Joint Photographic Experts Group Zip compressed JPEG images of processed EdgeTech SB-512i and SB-424 seismic-reflection profiles and associated metadata. Use WinZip or pkUnzip 71 https://pubs.usgs.gov/of/2009/1072/GIS/hyperlink_images/DH_SeismicProfiles.zip Data can be downloaded via the World Wide Web (WWW) DVD-ROM 4.75 Gbytes UDF none Digital copies of these chirp seismic data may also be obtained in the SEG-Y Rev. 1 standard format upon request. The data would be packaged on DVD, and contain the chirp-processed, envelope traces. These data can be viewed with any JPEG image viewing software. 20240318 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 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 None None