U.S. Geological Survey
2012
PNG formatted images of EdgeTech SB-424 seismic-reflection profiles collected by the U.S. Geological Survey -Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010.
1.0
remote-sensing image
Open-File Report
2011-1184
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/2010-003-FA_seisimage.zip
Open-File Report
2011-1184
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
Elizabeth A. Pendleton
2012
High-Resolution Geophysical Data From the Sea Floor Surrounding the Western Elizabeth Islands, Massachusetts
https://pubs.usgs.gov/of/2011/1184/
1.0
David C. TwichellDavid S. FosterCharles R. WorleyBarry J. IrwinWilliam W. Danforth
2010-003-FA_metadata_holder.txt
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 seafloor 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 2-30 meters. 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/html/current_map.html>). The data collected in this study area located around the western extent of the Elizabeth Islands includes high resolution bathymetry, acoustic-backscatter intensity, seismic-reflection, and navigation data. These data were collected during a nearshore cruise in September 2010 onboard the R/V Rafael using the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, an Edgetech 424 chirp subbottom profiling system, and 4 GPS antennae. More information about the cruise conducted as part of the project: Geologic Mapping of the Seafloor Offshore of Massachusetts can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage:
<http://quashnet.er.usgs.gov/data/2010/10003/>
PNG 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 PNG images represent approximately 253 km of chirp seismic data collected with the EdgeTech 424 in Sept. 2010. This format is universal and yields an easily browseable pictorial view of the seismic profiles. Each profile image is hotlinked to its corresponding trackline navigation contained within a polyline shapefile ('2010-003-FA_Chirp424_tracklines.shp'), and even 500 shot-point locations are available in a point shapefile ('2010-003-FA_Chirp424_500sht.shp). All of these data are available in an ESRI ArcMap project, as well as separate .zip archives on this digital data DVD archive (https://pubs.usgs.gov/of/2011/1184/GIS_catalog/).
en
2010091020100916
Data were not collected on 20100915 due to weather conditions.
None planned
-70.992374
-70.849060
41.460852
41.388525
333329.500000
340129.500000
4583700.000000
4588950.000000
General
U.S. Geological Survey
USGS
Woods Hole Coastal and Marine Science Center
WHCMSC
Coastal and Marine Geology Program
CMGP
PNG
seismic-reflection
SEGY
profiles
seismic
subbottom
image
chirp
EdgeTech
SB-424
WHCMSC field activity serial number 2010-003-FA
R/V Rafael
Edgetech SB-424Info Bank ID R-3-10-BZ
ISO 19115 Topic Category
geoscientificInformation
oceans
oceans and coastal
oceans and estuaries
imageryBaseMapsEarthCover
General
North America
Atlantic Ocean
Massachusetts
Cuttyhunk Island
Nashawena Island
Elizabeth Islands
Buzzards Bay
Vineyard Sound
Quicks Hole
Cuttyhunk Harbor
Sow and Pigs Reef
Penikese IslandGull IslandUnited States
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 originator of the dataset.
Oceanographer
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
508-548-8700 x2266
508-457-2310
dtwichell@usgs.gov
David C. Twichell
U.S. Geological Survey
Microsoft Windows 7 Enterprise Service Pack 1; ArcGIS Desktop 9.3 Service Pack 1; Build 1850
https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/seisimage.png
PNG image of SB-424 chirp seismic reflection profile
PNG
Filtered file
John Stockwell
CWP/SU: Seismic Uni*x
2008
document
Golden, CO
Center for Wave Phenomena - Colorado School of Mines
http://www.cwp.mines.edu/cwpcodes/
Paul Henkart
SIOSEIS
2007
document
LaJolla, CA
Scripps Institution of Oceanography, University of California - San Diego
http://sioseis.ucsd.edu/
Michael W. Norris
SEGY Rev.1 Data Exchange Format1
2002
document
Tulsa, OK
Society of Exploration Geophysicists
http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf
Alan K. Faichney
Processed seismic data were converted to portable network graphic (PNG) format for ease of seismic trace display. Quality control was conducted during processing. File naming is generally lxfy.png. Where x is the survey line number and y is the file number along a given survey line. There are a few exceptions that resulted from autofile changing in SonarWiz.MAP +SBP. A few lines are named lxfy_.png, and a few others are lxfy_00z.png; where x and y are the same as above and z is the autofile change number.
l8f3 and l26f1.001 had fewer than 50 shot points, so these lines were not included.
The SB-424 was towed from a starboard-side davit with 2-m of cable out on the R/V Rafael. The navigation for these data were acquired with an Communications Systems International (CSI), Inc. LGBX Pro Differential Global Positioning System (DGPS) receiver and an antenna mounted on the cabin of the R/V Rafael. All DGPS data are referenced to WGS84. The SonarWiz.MAP +SBP acquisition software logged the navigation coordinates (in arcseconds) to individual trace headers, but towfish layback and horizontal distance between the CSI antenna and the towfish was not accounted for. Based on horizontal offsets between the towfish and GPS receiver, and towfish motion behind the vessel, the resulting horizontal accuracy is assumed to be +/- 25 m.
David S. 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
An executable C-shell script called on SIOSEIS (version 10.2.25) to: 1) read the raw SEG-Y data so that shot number begins at one and increments by one for each SEG-Y file; 2) apply a time varying gain: a(i) = a(i) * (t*1000.)**alpha where a(i) is the trace and t is the time of the trace sample in seconds (alpha was 1.5).; 3) apply Automatic Gain Control (AGC) to every trace. AGC is a type of amplitude normalization (modification) that results in the amplitudes being more uniform, especially when the window length decreases. AGC starts by finding the first non-zero sample and then calculates the average absolute value of the window. Successive windows are calculated by shifting the window down one sample. Each average absolute value is then turned into a multiplier by dividing the average by an output level. A window length of 10 ms was used and 65 percent of the computed multiplier was applied.; and, 4) write the gained traces to new SEG-Y files.
20101030
SIOSEIS (version: 10.2.25); GeoGraphix SeisVision (version: R5000)
A Seismic Unix (version 4.1) script was used to read the gained 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 100 traces per inch. Images were plotted within a constant 14-inch vertical window of 60 milliseconds (Two-Way Travel Time) duration, yielding a vertical resolution of about 5 milliseconds per inch. The Postscript images were then converted with ImageMagick to PNG format for visualization in an image viewer.
201010
David S. Foster
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2271
(508) 457-2310
dfoster@usgs.gov
SIOSEIS (version: 10.2.25)
U.S. Geological Survey
disc
20100910
20100916
Data were not collected on 20100915 due to weather conditions.
Approximately 253 km of high-resolution chirp seismic-reflection profiles were collected using an EdgeTech 3100 portable sub-bottom system and SB-424 towfish (4-24 kHz) on the R/V Rafael of Woods Hole, MA. SonarWiz.MAP +SBP (version 4) acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the Society of Exploration Geophysicists Y (SEG-Y), revision 1, standard format (Norris and Faichney, 2002). The SB-424 towfish was towed astern of the starboard side of the vessel. Navigation coordinates were obtained from a DGPS antenna mounted 3-m above the waterline on the interferometric sonar pole and logged to the SEG-Y trace headers. Data were acquired using a 4.0 to 24.0 kHz frequency sweep, a 10 millisecond pulse length, a 0.1667 second shot rate, a 23 microsecond sample interval, and a 130 millisecond record length. A total of 253 km of seismic data were collected.
Raster
pixel
Elizabeth Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2259
(508) 457-2310
ependleton@usgs.gov
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.
WinZip
WinZip files contains compressed images of processed seismic-reflection profiles as well as associated metadata.
Use WinZip or pkUnzip
316 MB
309 MB
14.5
https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/2010-003-FA_seisimage.zip
https://pubs.usgs.gov/of/2011/1184/html/GIS_catalog.html
Data can be downloaded via the World Wide Web (WWW)
DVD-ROM
4.75
Gbytes
UDF
none
Downloadable Data
These data can be viewed with any PNG image viewing software.
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.
201010
Elizabeth Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2259
(508) 457-2310
ependleton@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
None
None
en
local time
http://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile
20110711
16594300
FALSE
20111118
14121000
20110919
14221100
{3D788222-0144-4E75-A59F-29E522B37743}
20111118
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.1850
2010-003-FA_metadata_holder.txt
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
file://\\IGSAGIEGWSEPE70\CI_SHARE\Cuttyhunk_prj\OFR_files\GIS_catalog\seisimage\2010-003-FA_metadata_holder.txtLocal Area Network002Filtered file