U.S. Geological Survey 2009 1.0 raster digital data Open-File Report 2008-1288 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20081288 https://pubs.usgs.gov/of/2008/1288/html/gis.html https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Seisimage/seisimage.zip Denny, J.F. Danforth, W.W. Foster, D.S. Sherwood, C.R. 2009 1.0 online Open-File Report 2008-1288 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2008/1288/ The USGS Woods Hole Science Center conducted a nearshore geophysical survey offshore of the southern coast of Martha's Vineyard, in the vicinity of the Martha's Vineyard Coastal Observatory (MVCO) in August 2007. This mapping program was part of a larger research effort supporting the Office of Naval Research (ONR) Ripples Directed-Research Initiative (DRI) studies at MVCO by providing data collection and modeling. The geophysical data will be used to provide initial conditions for wave and circulation models for the study area. Ultimately, geophysical mapping, oceanographic measurements and modeling will help to improve our understanding of coastal sediment-transport processes. The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters. JPEG images of each seismic profile were generated in order to incorporate images of the seismic data into Geographic Information System (GIS) projects and data archives utilizing HTML. These JPEG images represent 680 km of seismic data collected in 2007. This format is universal and yields an easily viewable image of the seismic profiles. Each profile image is hyperlinked to its corresponding trackline navigation contained within a polyline shapefile (seismic_trknav.shp), shot-point locations are available in a point shapefiles (seismic__500sht.shp, seismic__100sht.shp, and seismic__sht.shp). These data are available in an ESRI ArcMap project, as well as separate .zip archives (https://pubs.usgs.gov/pubs/of/2008/1288/GIS_catalog/). 20070809 20070813 ground condition Complete None planned -70.600292 -70.511213 41.347370 41.301252 USGS Metadata Identifier USGS:54b239b5-0184-4a7d-aee7-d12b44820a8e None U.S. Geological Survey USGS Woods Hole Science Center WHSC Coastal and Marine Geology Program CMGP Field Activity Number 07011 R/V Megan Miller JPG JPEG seismic-reflection SEG-Y profiles seismic subbottom image chirp EdgeTech SB-0512i JSF ISO 19115 Topic Category geoscientificinformation oceans USGS Thesaurus sub-bottom profiling image collections marine geophysics None North America Southeastern Massachusetts Martha's Vineyard Cape Cod Elizabeth Islands Atlantic Ocean United States Northeast United States Atlantic Ocean None The U.S. Geological Survey asks to be referenced as the originator of the dataset in any future publications. Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700x2311 5084572310 jdenny@usgs.gov https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Seisimage/seisimage_sm.jpg JPEG image of seismic-reflection profile JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500 Paul Henkart 2007 document LaJolla, CA Scripps Institution of Oceanography, University of California - San Diego http://sioseis.ucsd.edu/index.html John Stockwell 2007 document Golden, CO Center for Wave Phenomena - Colorado School of Mines http://www.cwp.mines.edu/cwpcodes/index.html Processed seismic data were converted to JPEG format for ease of seismic trace display. Quality control was conducted during processing. All acquired seismic data were processed and JPEG images produced. Line 92 was saved as l91f1_001 during acquisition. The EdgeTech SB-0512i was towed approximately 5 meters astern and approximately 1.5 meters below the sea surface. A GPS navigation receiver was mounted on the seismic sled to provide seismic navigation. GPS positions were sent, via radio modem, to a receiver positioned on the aft roof of the acquisition van aboard the R/V Megan Miller. GPS positions were sent directly to the EdgeTech J-Star seismic acquisition software. The horizontal accuracy of GPS is assumed to be ± 10 m (http://www.navcen.uscg.gov/). Information unavailable from original metadata - assumed USGS unknown Information unavailable from original metadata 20070809 20070813 ground condition Information unavailable from original metadata Approximately 680 km of high-resolution chirp seismic-reflection profiles were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz) mounted on a catamaran and towed off the stern of the R/V Megan Miller. 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 (http://www.edgetech.com/productlinemarine.html). Data were acquired using a 0.25-s shot rate, 5-ms pulse length and a 0.5-to-8.0 kHz swept frequency. Recorded trace lengths were approximately 250-ms. Trackline spacing varied from 40 meters in water depths less than 15 meters to 70-meter spacing in water depths greater than 15 meters. Shore perpendicular tracklines spacing ranged from 500 m to 1 km apart. A C program, jsf2segy, created at the USGS Woods Hole was used to convert the Edgetech JSF format files to SEG-Y. Scripts utilizing SIOSEIS (version 2007.8) were then executed in order to remove sea surface heave and mute the water column within 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 60 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. An additional SIOSEIS script was executed to apply an automatic gain control (AGC) to the heave corrected SEG-Y files, resulting in more uniform amplitudes throughout the record (SIOSEIS, 2007). Software: SIOSEIS 2007.8 2007 Dave Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700x2271 5084572310 dfoster@usgs.gov A C-Shell script using 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 was then executed. All images were created with a horizontal scale of 200 traces per inch. The profiles contain 50 milliseconds of Two-Way Travel Time within an 8-inch vertical window, yielding 6.25 milliseconds per inch. Postscript images were converted to JPEG format using the UNIX ImageMagick (version 5.5.6). Software: Seismic Unix 4.1, ImageMagick 5.5.6 2007 Dave Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700x2271 5084572310 dfoster@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.). Reordered the links in the identification section so a landing page link is first. Attempted to modify http to https where appropriate. 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. 20171020 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 Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700x2311 5084572310 jdenny@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 WinZip (version 9.0) compressed JPEG images of processed Edgetech SB-512i seismic-reflection profiles and associated metadata Use WinZip or pkUnzip 139 https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Seisimage/seisimage.zip Data can be downloaded via the World Wide Web (WWW) 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 JPEG data can be viewed with any image viewing software. 20240318 Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700x2311 5084572310 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