U.S. Geological Survey
Unpublished material
SEG-Y format of EdgeTech SB-512i seismic-reflection profiles collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of the Gulf Islands, MS, 2010.
raster digital data
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-012-FA
In 2010, the U.S. Geological Survey in Woods Hole, MA and St. Petersburg, FL, in partnership with the U.S. Army Corps of Engineers, Mobile District conducted geologic mapping to characterize the seafloor and shallow subsurface stratigraphy offshore of the Gulf Islands of Mississippi. The mapping was carried out during two cruises in March, 2010 on the R/V Tommy Munro of Biloxi, MS. Data were acquired with the following equipment: an SEA Ltd SwathPlus interferometric sonar (both 234 kHz and 468 kHz systems), a Klein 3000 and a Klein 3900 dual frequency sidescan-sonar, and an Edgetech 512i chirp subbottom profiling system. The long-term goal of this mapping effort is to produce high-quality, high-resolution geologic maps and geophysical interpretations that can be utilized to identify sand resources within the region and better understand the Holocene evolution and anticipate future changes in this coastal system. More information on the field work can be accessed from the Woods Hole Coastal and Marine Science Center Field Activity webpage https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-012-FA or the St. Petersburg Coastal and Marine Geology InfoBank https://walrus.wr.usgs.gov/infobank/m/m210gm/html/m-2-10-gm.meta.html.
These chirp seismic-reflection data were collected to use for interpretation of shallow subsurface stratigraphy offshore of the Gulf Islands National Seashore, between Cat Island and West Horn Island, Mississippi.
For more information on the seismic surveys see https://walrus.wr.usgs.gov/infobank/m/m210gm/html/m-2-10-gm.meta.html and https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-012-FA
These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization.
The PNG format of these data (along with other data associated with this field activity) were released through the Open-File Report 2010-1178 (https://pubs.usgs.gov/of/2010/1178/). See the cross-reference for full citation information.
20100304
20100317
Data were not collected on 20100310, and 20100312-20100314 due to weather conditions, crew changes, or survey location.
None planned
-89.082139
-88.710194
30.229300
30.092922
USGS Metadata Identifier
USGS:a336d21f-772b-4fb3-a97d-e57078d53eb1
None
U.S. Geological Survey
USGS
Woods Hole Coastal and Marine Science Center
WHCMSC
St. Petersburg Coastal and Marine Science Center
Coastal and Marine Geology Program
CMGP
PNG
seismic-reflection
SEGY
profiles
seismic
subbottom
image
chirp
EdgeTech
SB-512i
WHCMSC field activity serial number 2010-012-FA
R/V Tommy Munro
ISO 19115 Topic Category
geoscientificInformation
oceans
imageryBaseMapsEarthCover
Data Categories for Marine Planning
distributions
substrate
Marine Realms Information Bank (MRIB) Keywords
seismic reflection profiling
marine geophysics
USGS Thesaurus
seismic reflection methods
sub-bottom profiling
marine geophysics
None
Mississippi
Gulf Islands
North Central Gulf Coast
United States
West Ship Island
East Ship Island
Horn Island
Dog Key Pass
Camille Cut
Petit Bois Island
Gulfport Ship Channel
Gulf of Mexico
Cat Island
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.
David C. Twichell
U.S. Geological Survey
Oceanographer
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2266
(508) 457-2310
dtwichell@usgs.gov
https://pubs.usgs.gov/of/2010/1178/GIS_catalog/Seisimage/WHCMSC_seisimage.png
PNG image of seismic-reflection profile
PNG
Microsoft Windows XP Professional x64 Edition Version 2003 Service Pack 2
John Stockwell
2008
CWP/SU: Seismic Uni*x
document
Golden, CO
Center for Wave Phenomena - Colorado School of Mines
http://www.cwp.mines.edu/cwpcodes/title_page.html
Paul Henkart
2007
SIOSEIS
document
LaJolla, CA
Scripps Institution of Oceanography, University of California - San Diego
http://sioseis.ucsd.edu/title_page.html
Michael W. Norris
Alan K. Faichney
2002
SEGY Rev.1 Data Exchange Format1
document
Tulsa, OK
Society of Exploration Geophysicists
http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf
Elizabeth A. Pendleton
Wayne E. Baldwin
William W. Danforth
Nancy T. Dewitt
Arnell S. Forde
David S. Foster
Kyle W. Kelso
William R. Pfeiffer
Aaron M. Turecek
James G. Flocks
David C. Twichell
2011
Geophysical Data from offshore of the Gulf Islands National Seashore, Cat Island to Western Horn Island, Mississippi
1.0
Open-File Report
2010-1178
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/of/2010/1178/
Processed seismic data were converted to portable network graphic (PNG) format for ease of seismic trace display. Quality control was conducted during processing.
All of the seismic-reflection profiles collected during field activity 2010_012 are included as processed PNG images in this report.
The SB-512i was mounted on a catamaran and towed at the sea surface approximately 50 m astern of the R/V Tommy Munro. Position data were provided by a Differential Global Positioning System (DGPS) navigation receiver mounted on the catamaran, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. The SonarWiz.MAP +SBP acquisition software logged the navigation coordinates (in arcseconds) to individual trace headers. Positional accuracy is assumed to be better than 10 m.
U.S. Geological Survey
unknown
Information unavailable from original metadata
disc
20100304
20100317
Data were not collected on 20100310, and 20100312-20100314 due to weather conditions, crew changes, or survey location.
Information unavailable from original metadata
High-resolution chirp seismic-reflection profiles were collected using an EdgeTech Geo-Star Full Spectrum Sub-bottom (FSSB) system and SB-512i towfish (0.5-12 kHz) (EdgeTech, 2008). SonarWiz.MAP +SBP acquisition software (Chesapeake Technology Inc., 2009) 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-512i towfish was mounted on a catamaran and towed astern of the starboard side of the vessel. Navigation coordinates were obtained from a DGPS antenna mounted on the catamaran and logged to the SEG-Y trace headers. Data were acquired using a 0.5 to 8 kHz frequency sweep, a 5 millisecond pulse length, a 0.25 second shot rate, a 46 microsecond sample interval, and a 100 millisecond record length. A total of 1523 km of seismic data were collected.
An executable C-shell script called on SIOSEIS (version 10.2.25) to: 1) read the raw SEG-Y data from the previous step and create shot gathers containing two consecutive traces; 2) create a stacked trace from the two trace gathers while maintaining the navigation coordinates (in arc-seconds) from the header of the first trace in each; and 3) write the stacked traces to new SEG-Y files. This stacking flow ensured that the resulting traces were spaced greater than 0.5 m apart along the trackline, which is a prerequisite for the traces to be loaded into GeoGraphix SeisVision (version R5000) for digital interpretation.
201003
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
An executable C-shell script called on SIOSEIS (version 10.2.25) to use the process 'WBT' specifying the threshold option to predict the vertical location of the sea floor by identifying the first amplitude in each trace that exceeded a user defined value. Two-way travel times (milliseconds) to the sea floor at each trace were recorded the trace headers and saved to an ASCII text file.
201009
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
All SEG-Y trace data were imported into GeoGraphix SeisVision (version R5000), a 2-dimensional, digital seismic interpretation software, and seafloor values were imported as ASCII text horizon data. The horizon smooth utility was used to remove spurious seafloor values for discrete traces and corrected values were exported to a new ASCII text file.
201009
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
An executable C-shell script called on SIOSEIS (version 10.2.25) to remove sea surface heave and mute water column portions of the traces by: 1) loading the corrected seafloor times into the SEG-Y trace headers; 2) using process 'SWELL' to suppress the heave by shifting traces vertically; and 3) muting each trace between time zero and the time of the smoothed sea floor pick using process 'MUTE', 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 PNG browse images and digital interpretation.
201009
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
A 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. Images were plotted within a constant 12-inch vertical window of 50 milliseconds (Two-Way Travel Time) duration. The Postscript images were then converted to PNG format using ImageMagick (version 5.5.6).
201009
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
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.). The link to the data in the Identification_Information section had to be fixed. Attempted to modify http to https where appropriate. Added a landing page link as the first link in the identification section. The link to the data in the Distribution_Information section had to be fixed. Fixed the link to the browse graphic. Updated the link to the field activity. 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. Updated a link to a cross-reference. 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.
20171030
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
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
20171203
U.S. Geological Survey
Alan O. Allwardt
Contractor -- Information Specialist
Mailing and Physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7551
831-427-4748
aallwardt@usgs.gov
This metadata record was modified from one describing PNG images to reflect the SEG-Y version of the same data (Open-File Report 2010-1178, https://pubs.usgs.gov/of/2010/1178/). Changes were made to the Citation and Distribution_Information.
20171204
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
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
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.
SEG-Y
Link is to a folder containing SEG-Y files.
https://cmgds.marine.usgs.gov/data/2010_012_FA/
Data can be downloaded via the World Wide Web (WWW). The online link gives access to the folder containing the individual SEG-Y files.
none
These data require software that can read SEG-Y data.
20200908
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
local time
None
None