Originator: Arnell S. Forde
Originator: Shawn V. Dadisman
Originator: Dana S. Wiese
Originator: Daniel C. Phelps
Archive of Digital Boomer Subbottom Data Collected During USGS Cruises 99FGS01 and 99FGS02 Offshore Southeast and Southwest Florida, July and November, 1999
Geospatial_Data_Presentation_Form: Archive for Subbottom Profile Data
Series_Name: U.S. Geological Survey Data Series
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
During July 19 - 26 and November 17 - 18 of 1999, the U.S. Geological Survey (USGS), in cooperation with the Florida Geological Survey (FGS), conducted geophysical surveys of the Atlantic Ocean offshore of Florida's southeast coast from Orchid to Jupiter, FL and the Gulf of Mexico offshore of Venice, FL. This report serves as an archive of unprocessed digital boomer subbottom data, trackline maps, navigation files, GIS information, and formal FGDC metadata. Filtered and gained digital images of the seismic profiles are also provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG Y revision 0 format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992) are also provided. These data are also available for viewing using GeoMapApp (<http://www.geomapapp.org/
>) and Virtual Ocean (<http://www.virtualocean.org/
>) multi-platform open source software. In addition to this DVD, the SEG Y files can also be downloaded from the USGS Coastal and Marine Geoscience Data System (<http://cmgds.marine.usgs.gov
The data archived here were collected under a cooperative agreement between the Florida Geological Survey and the USGS.
The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, FL, assigns a unique identifier to each cruise or field activity. For example, 99FGS01 and 99FGS02 tells us the data were collected in 1999 for the Florida Geological Survey (FGS) cooperative agreement and the data were collected during the first and second field activities for that project in that calendar year. Refer to <http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html
> for a detailed description of the method used to assign the cruise ID.The boomer subbottom processing system consists of an acoustic energy source that is made up of capacitors charged to a high voltage and discharged through a transducer in the water. The transducer is towed on a sled floating on the water surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water column and shallow stratigraphy below. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), detected by the receiver (hydrophone streamer), and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (for example, 0.5 s) and recorded for specific intervals of time (for example, 100 ms). In this way, a 2-D vertical image of the shallow geologic structure beneath the ship track is produced.An Applied Acoustic Engineering CSP 300 provided 300 Joules of energy per shot. Reflected energy was received by a Innovative Transducers, Inc. (ITI) ST-5 10-channel streamer and recorded by Triton Elics International, Inc. (TEI) Delph Seismic v. 1.36 acquisition software. The streamer contains 10 hydrophones evenly spaced every 0.60 m. The streamer was positioned directly behind the research vessel (parallel to the boomer sled), with a lateral separation of approximately 14 m (99FGS01) and 24 m (99FGS02). Refer to figure 2 included with this archive for a diagram of the acquisition geometries. The sample frequencies of the data were 240-2400 Hz and 8000 Hz, and record length was 100 ms. The shot spacing was highly variable; however, based on survey speeds of 3 knots and a shot rate of every 1 s, shot spacing was about 1.54 m.The unprocessed seismic data are stored in SEG Y rev. 0, integer, Motorola format, which is a standard digital format that can be read and manipulated by most seismic processing software packages (Barry and others, 1975). The SEG Y formatted trace files have a .TRA extension. The printable profiles provided here are GIF images that were filtered and gained using Seismic Unix software.
Currentness_Reference: Data collection interval
Maintenance_and_Update_Frequency: None planned
Access_Constraints: None. These data are held in the public domain.
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Coastal information
Theme_Keyword: Subbottom profile
Theme_Keyword: Seismic reflection
Theme_Keyword: Society of Exploration Geophysicists
Theme_Keyword: SEG Y
Theme_Keyword: Florida Geological Survey
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: seismic reflection
Theme_Keyword: marine geophysics
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: seismic reflection methods
Theme_Keyword: sub-bottom profiling
Theme_Keyword: marine geophysics
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content
Place_Keyword: United States of America
Place_Keyword: Atlantic Ocean
Place_Keyword: Gulf of Mexico
Place_Keyword: Fort Pierce
Place_Keyword: Sebastian Inlet
The U.S. Geological Survey and Florida Geological Survey (FGS) request to be acknowledged as originators of the data in future products or derivative research.
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Address_Type: mailing and physical
Contact_Voice_Telephone: (727) 803-8747 ext. 3111
Address: 600 4th Street South
City: Saint Petersburg
Figure 1. Location map of digital boomer subbottom data collected during USGS Field Activities 99FGS01 and 99FGS02. This map was created at a scale of 1:442,800. Refer to the Lineage section below for the trackline map creation process.
Figure 3. Location map of digital boomer subbottom data collected during USGS Field Activity 99FGS01. This map was created at a scale of 1:654,650. Refer to the Lineage section below for the trackline map creation process.
Figure 4. Location map of digital boomer subbottom data collected during USGS Field Activity 99FGS02. This map was created at a scale of 1:239,600. Refer to the Lineage section below for the trackline map creation process.
Funding and (or) support for this study was provided by the USGS Coastal and Marine Geology Program and FGS. This document was improved by the reviews of reviewer 1 (USGS) and reviewer 2 (Jacobs Technology Inc.) of the USGS - St. Petersburg, FL. Disc Image Credit: Schmaltz, Jeff, MODIS Rapid Response Team at the NASA Goddard Space Flight Center, 2004, UnitedStates.A2004106.1855.500m.jpg. Also available on-line at <http://eoimages.gsfc.nasa.gov/ve/6886/UnitedStates.A2004106.1855.500m.jpg
Originator: Cohen, J.K., and Stockwell, J.W., Jr., CWP/SU
Seismic Unix Release 41: A free package for seismic research and processing, Center for Wave Phenomena, Colorado School of Mines
Originator: Zihlman, F.N., USGS
DUMPSEGY V1.0: A program to examine the contents of SEG Y disk-image seismic data
Series_Name: U.S. Geological Survey Open-File Report
Other_Citation_Details: 28 pages
Originator: Barry, K.M., Cavers, D.A., and Kneale, C.W.
Title: Recommended standards for digital tape formats
Other_Citation_Details: pages 344-352
Issue_Identification: v. 40, no. 2