Daniel S. Brothers
Neal W. Driscoll
Graham M. Kent
Robert L. Baskin
Alicia F. Balster-Gee
20220322
Sub-bottom chirp data acquired in the Salton Sea, California, between 2006 and 2008
seismic-reflection data in SEG-Y format
data release
DOI:10.5066/P9ER5TNT
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9ER5TNT
More than 1,000 line-km of sub-bottom chirp data were collected with an Edgetech 0.5-16 kHz subscan system by Scripps Institution of Oceanography between 2006 and 2008 in the Salton Sea, California, with assistance from the U.S. Geological Survey (USGS). Data were subsequently donated by Scripps to the USGS for public release (USGS field activity identifier 2006-603-DD).
The Salton Sea is a large, shallow lake located in the central Salton Trough of Southern California that covers the southernmost extension of the San Andreas Fault (SAF) and the northernmost transtensional step-over associated with Gulf of California oblique rifting. Seismic hazard assessments require regional studies that account for rupture along secondary faults and their potential to inhibit or promote failure on the SAF. Therefore, understanding the kinematic relationships and seismic cycling between the SAF and extensional faults beneath the Salton Sea is of utmost importance. The data in this report were acquired to better understand the late-Holocene depositional framework and deformation history within the submerged portion of the San Andreas-Imperial Fault pull-apart basin, and to examine coseismic deformation preserved in Lake Cahuilla sediments. Previously published articles (for example, Brothers and others, 2009; Brothers and others, 2011) used the sub-bottom chirp data included in this release to map numerous faults, to define the shallow basin architecture, and to estimate the timing of coseismic displacement across several faults. The Scripps Institution of Oceanography was the lead institution for this field activity; the data have been donated for public release. These data and information are intended for science researchers, students from elementary through college, policy makers, and the general public.
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2006-603-DD
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
20060804
20080904
Ground condition at time data were collected
None planned
-116.13977054
-115.55090312
33.57526889
33.06484469
USGS Metadata Identifier
USGS:e2c46a75-a30a-45ab-a837-3f6b0344ac6c
ISO 19115 Topic Category
geoscientificInformation
Data Categories for Marine Planning
Substrate
USGS Thesaurus
sub-bottom profiling
marine geophysics
geospatial datasets
Marine Realms Information Bank (MRIB) keywords
seismic reflection profiling
lake
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
Geographic Names Information System (GNIS)
State of California
Niland
Salton City
Bombay Beach
Mecca
Brawley
Salton Sea
None
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and Scripps Institution of Oceanography as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
SaltonSeaChirp_Map_2006-603-DD.png
Map of chirp tracklines collected between 2006 and 2008
PNG
California Department of Water Resources, California Department of Fish and Game, UCSD Academic Senate, Scripps Institution of Oceanography, Sonny Bono Salton Sea National Wildlife Refuge, National Science Foundation, and Southern California Earthquake Center
SEGY Rev 1
Daniel S. Brothers
Neal W. Driscoll
Graham M. Kent
A. J. Harding
J. M. Babcock
Robert L. Baskin
2009
Tectonic evolution of the Salton Sea inferred from seismic reflection data
Brothers, D., Driscoll, N., Kent, G., Harding, A.J., Babcock, J.M., and Baskin, R.L., 2009, Tectonic evolution of the Salton Sea inferred from seismic reflection data: Nature Geoscience, v. 2, p. 581–584, https://doi.org/10.1038/ngeo590.
https://doi.org/10.1038/ngeo590
Daniel S. Brothers
D. K. Klib
K. Luttrell
Graham M. Kent
G. Lin
Neal W. Driscoll
2011
Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea
Brothers, D., Kilb, D., Luttrell, K., Driscol, N., and Graham, K., 2011, Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea: Nature Geoscience, v. 4, p. 486–492, https://doi.org/10.1038/ngeo1184.
https://doi.org/10.1038/ngeo1184
Identified as the best available version.
Subbottom data were collected between 2006 and 2008 by researchers from Scripps Institution of Oceanography aboard USGS Utah Water Science Center’s R/V Stevens using a custom Edgetech sub-bottom profiling system owned by the Scripps Institution of Oceanography. This system consists of a source transducer and an array of receiving hydrophones housed in a 500-lb “fish” towed at a depth of several meters below the water surface. The swept-frequency “chirp” source signal is between 500 and 16,000 Hz, and data are recorded by hydrophones located on the bottom of the fish. Quality control was conducted during the collection process.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Position data were provided by a Hemisphere V100 Global Positioning System using L1, C/A code and carrier phase smoothing with a stated accuracy of 60 centimeters.
Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level.
The chirp seismic-reflection profiles were acquired with a swept-frequency source towed at about 3 meters below the sea surface. Data were recorded to Edgetech JSF format using Edgetech recording software. Survey speeds were approximately 4 knots. Sub-bottom surveys employed different chirp pulses depending on sub-bottom conditions. The 0.7 – 3.0 kHz, 50 ms pulse provided greatest penetration (up to 60 m) while the 1.0 – 15.0 kHz, 30 ms pulse produced the highest vertical resolution (~15 cm). Acquisition parameters for all SEG-Y files are recorded in the textual headers.
20080904
Correction was made to keywords. No data were changed. (scochran@usgs.gov)
20220525
Horizontal X and Y locations for the seismic profile locations are provided and stored in the SEG-Y data trace headers in header bytes 81 and 85 locations.
WGS 1984 UTM Zone 11N
0.9996
-117.0
0.0
500000.0
0.0
coordinate pair
0.0001
0.0001
Meter
D_WGS_1984
WGS_1984
6378137.0
298.257223563
Local surface
0.1
meters
Attribute values
Navigation and seismic shots with Time Stamp in standard SEG-Y file format
Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards
U.S. Geological Survey - CMGDS
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
SaltonSea_chirp_2006-603-DD.zip contains high-resolution seismic-reflection (SEG-Y) data donated to PCMSC for public release by Scripps Institution of Oceanography. These data are divided up and presented by navigation line, as reflected in the individual file names.
Unless otherwise stated, all data, metadata, and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
SEG-Y
SEG-Y rev 1
Zip file contains the raw seismic data per navigation line
Winzip, 7-zip, or Winrar are free software that will open .zip files
21500
https://doi.org/10.5066/P9ER5TNT
Data can be downloaded using the Network_Resource_Name link and scrolling down to the Seismic Data section.
None.
Use of SEG-Y data requires specialized software, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others.
20220525
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998