Metadata: Identification_Information: Citation: Citation_Information: Originator: Daniel S. Brothers Originator: Neal W. Driscoll Originator: Graham M. Kent Originator: Robert L. Baskin Originator: Alicia F. Balster-Gee Publication_Date: 20220322 Title: Sub-bottom chirp data acquired in the Salton Sea, California, between 2006 and 2008 Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9ER5TNT Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9ER5TNT Description: Abstract: 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). Purpose: 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. Supplemental_Information: 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20060804 Ending_Date: 20080904 Currentness_Reference: Ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -116.13977054 East_Bounding_Coordinate: -115.55090312 North_Bounding_Coordinate: 33.57526889 South_Bounding_Coordinate: 33.06484469 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:e2c46a75-a30a-45ab-a837-3f6b0344ac6c Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: seismic reflection profiling Theme_Keyword: lake Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of California Place_Keyword: Niland Place_Keyword: Salton City Place_Keyword: Bombay Beach Place_Keyword: Mecca Place_Keyword: Brawley Place_Keyword: Salton Sea Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: SaltonSeaChirp_Map_2006-603-DD.png Browse_Graphic_File_Description: Map of chirp tracklines collected between 2006 and 2008 Browse_Graphic_File_Type: PNG Data_Set_Credit: 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 Native_Data_Set_Environment: SEGY Rev 1 Cross_Reference: Citation_Information: Originator: Daniel S. Brothers Originator: Neal W. Driscoll Originator: Graham M. Kent Originator: A. J. Harding Originator: J. M. Babcock Originator: Robert L. Baskin Publication_Date: 2009 Title: Tectonic evolution of the Salton Sea inferred from seismic reflection data Other_Citation_Details: 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. Online_Linkage: https://doi.org/10.1038/ngeo590 Cross_Reference: Citation_Information: Originator: Daniel S. Brothers Originator: D. K. Klib Originator: K. Luttrell Originator: Graham M. Kent Originator: G. Lin Originator: Neal W. Driscoll Publication_Date: 2011 Title: Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea Other_Citation_Details: 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. Online_Linkage: https://doi.org/10.1038/ngeo1184 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Identified as the best available version. Logical_Consistency_Report: 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. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Lineage: Process_Step: Process_Description: 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. Process_Date: 20080904 Process_Step: Process_Description: Correction was made to keywords. No data were changed. (scochran@usgs.gov) Process_Date: 20220525 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: 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. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: WGS 1984 UTM Zone 11N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -117.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0001 Ordinate_Resolution: 0.0001 Planar_Distance_Units: Meter Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: Local surface Depth_Resolution: 0.1 Depth_Distance_Units: meters Depth_Encoding_Method: Attribute values Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Navigation and seismic shots with Time Stamp in standard SEG-Y file format Entity_and_Attribute_Detail_Citation: Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: 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. Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: SEG-Y rev 1 Format_Information_Content: Zip file contains the raw seismic data per navigation line File_Decompression_Technique: Winzip, 7-zip, or Winrar are free software that will open .zip files Transfer_Size: 21500 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9ER5TNT Access_Instructions: Data can be downloaded using the Network_Resource_Name link and scrolling down to the Seismic Data section. Fees: None. Technical_Prerequisites: 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. Metadata_Reference_Information: Metadata_Date: 20220525 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998