Metadata: Identification_Information: Citation: Citation_Information: Originator: Ray W. Sliter Originator: James E. Conrad Originator: Holly F. Ryan Originator: Peter J. Triezenberg Publication_Date: 2017 Title: Chirp seismic-reflection data of field activity S-07-11-SC: offshore San Diego, and Los Angeles Counties, southern California from 2011-06-08 to 2011-06-22 Geospatial_Data_Presentation_Form: chirp seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F7X63K3K Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://walrus.wr.usgs.gov/namss/data/2011/namss.S-07-11-SC.scs.chirp.zip Online_Linkage: https://doi.org/10.5066/F7X63K3K Description: Abstract: This dataset includes raw and processed, high-resolution seismic-reflection data collected in 2011 to collect information on active offshore faults. The survey area is offshore southern California between Long Beach and San Diego. The data were collected aboard the U.S. Geological Survey R/V Parke Snavely. The seismic-reflection data were acquired using an EdgeTech 512 subbottom profiler. Subbottom acoustic penetration spanned tens to about 50 meters, variable by location. Purpose: The U.S. Geological Survey (USGS) collected high-resolution seismic-reflection in June 2011, between Santa Catalina Island and Oceanside, southern California. The survey was designed to image faults and folds associated with movement on the numerous faults offshore southern California, including the Newport-Inglewood, Palos Verdes, San Pedro Basin, San Diego Trough, and several other unnamed fault zones. This data can be used to update the USGS Quaternary fault database and in shaking hazard models developed by the Working Group for California Earthquake probabilities. This work was funded by the USGS Coastal and Marine Catastrophic Hazards Project. Data were collected aboard the USGS R/V Parke Snavely simultaneously with a single-channel minisparker system [DOI:10.5066/F7SF2TCV]. About 204 km of data were collected using an EdgeTech Chirp 512. Subbottom acoustic penetration spanned tens to about 50 meters, variable by location. This dataset also includes navigation files of the surveyed transects. The images of bedrock, sediment deposits and tectonic structure provide geologic information that is essential to hazard assessment, regional sediment management and coastal and marine spatial planning at Federal, State and local levels, as well as to future research on the geomorphic, sedimentary, tectonic and climatic record of Southern California. 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=S0711SC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20110608 Ending_Date: 20110622 Currentness_Reference: ground condition at the time the data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -118.45020 East_Bounding_Coordinate: -117.33957 North_Bounding_Coordinate: 33.54561 South_Bounding_Coordinate: 32.92887 Keywords: Theme: Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD) Theme_Keyword: Bathymetry Theme_Keyword: Continental Margins Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sub-bottom profiling Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: seismic reflection profiling Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Bathymetry and Elevation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: chirp Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMG Theme_Keyword: CMGP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of California Place_Keyword: San Diego County Place_Keyword: Los Angeles County Place_Keyword: Long Beach Place_Keyword: San Diego 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 as the originator(s) of the dataset and in products derived from these data. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This information is not intended for navigational purposes. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: Ray W. Sliter Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: USA Contact_Voice_Telephone: 831-460-7427 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: rsliter@usgs.gov Native_Data_Set_Environment: SEG-Y Rev 1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Identified as best available version. Logical_Consistency_Report: Subbottom data were collected during USGS cruise S-07-11-SC using an Edgetech 512 Chirp subbottom profiling system consisting 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 sea surface. 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 Differential Global Positioning System (DGPS) navigation receiver. The Edgetech 512 Chirp fish was deployed 7m behind the DGPS receiver. Layback is estimated to be 7 ± 3m. No layback correction from the DGPS receiver position was applied to navigation data. 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. Vertical resolution is approximately 0.5 milliseconds and vertical accuracy is approximately ±4 milliseconds depending on sea state. Lineage: Process_Step: Process_Description: Seismic-reflection data were collected using an Edgetech 512 Chirp subbottom profiling system consisting 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 sea surface. The swept-frequency “chirp” source signal is between 500 and 4,500 Hz, and data are recorded by hydrophones located on the bottom of the fish. At boat speeds of 4 to 4.5 nm/hour, seismic traces were collected roughly every 1 to 2 meters. The data consist of three-channels, a raw channel, a 90-degree phase-shifted channel and an “amplitude envelop” channel created and transformed internally from the other two channels. The data were recorded in standard SEG-Y 16-bit integer format with Triton Subbottom Logger (SBL) software that merges seismic-reflection data with differential GPS navigation data. Process_Date: 2011 Process_Step: Process_Description: The processed seismic-reflection SEG-Y files consist of the internally transformed amplitude envelope channel corrected for the depth of the fish below the sea surface using Paradigm Geophysical Echos seismic processing software (see: http://www.pdgm.com/products/echos/). 1) SEG-Y channel with sequence number “1” was written to a SEG-Y file; 2) The fish depth header word was read and converted from millimeters to two-way travel time to create a fish-depth static value; and 3) The fish depth static was applied to the data to correct for the vertical up and down movement of the Chirp fish and a final processed SEG-Y was output. Process_Date: 2011 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Horizontal X and Y locations for the seismic profile locations are provided in ASCII position files and are stored in the SEG-Y data trace headers in the standard header locations. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_84 Ellipsoid_Name: WGS_84 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, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: USA Contact_Voice_Telephone: 1-831-460-7435 Resource_Description: namss.S-07-11-SC.scs.chirp.zip – this zip file contains raw and processed high-resolution seismic-reflection (SEG-Y) and navigation (ASCII) data collected during PCMSC field activity S-07-11-SC. The data are divided up and presented by navigation line, as reflected in the individual file name(s). 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 and processed seismic data per navigation line File_Decompression_Technique: Winzip, 7-zip, or Winrar are free software that will open .zip files Transfer_Size: 11782 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://walrus.wr.usgs.gov/namss/data/2011/namss.S-07-11-SC.scs.chirp.zip Network_Resource_Name: https://doi.org/10.5066/F7X63K3K Fees: None Metadata_Reference_Information: Metadata_Date: 20170313 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Ray W Sliter Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: USA Contact_Voice_Telephone: 831-460-7427 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: rsliter@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998