Metadata: Identification_Information: Citation: Citation_Information: Originator: Travis Alongi Originator: Alicia F. Balster-Gee Originator: Jared W. Kluesner Originator: Ray W. Sliter Publication_Date: 20221115 Title: Reprocessed multichannel seismic reflection data acquired offshore Southern California during USGS field activity O-1-99-SC Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GR0PWF 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/P9GR0PWF Description: Abstract: Multichannel seismic (MCS) data were collected by the U.S. Geological Survey (USGS) in June of 1999 in the coastal zone and continental shelf between Los Angeles and San Diego, offshore California (USGS field activity O199SC). In 2021 these data were reprocessed to improve accuracy and resolvability of geologic structures and fault systems of California’s continental margin. Purpose: MCS data were acquired to support the Southern California Earthquake Hazards project to help mitigate earthquake and tsunami hazards for the Southern California region by improving our understanding of how deformation is distributed (spatially and temporally) in the offshore with respect to the onshore region. The reprocessed dataset enhances the seismic data quality which will be useful for future research on the geomorphic, sedimentary and tectonic record offshore California. These data are intended for science researchers, students, 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=O199SC 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: 19990605 Ending_Date: 19990617 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: -118.605396 East_Bounding_Coordinate: -117.242340 North_Bounding_Coordinate: 33.869064 South_Bounding_Coordinate: 32.605396 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:43a75867-f377-4772-8b6c-7d976a618785 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geophysics Theme_Keyword: sub-bottom profiling Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: data processing Theme_Keyword: seismic reflection profiling Theme_Keyword: Global Positioning System (GPS) observations 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 Theme_Keyword: shapefile Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: sub-bottom profiling Theme_Keyword: SEG-Y traces Theme_Keyword: R/V Ocean Olympic Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of California Place_Keyword: Santa Monica Bay Place_Keyword: San Pedro Bay Place_Keyword: San Pedro Channel Place_Keyword: Gulf of Santa Catalina Place_Keyword: Santa Catalina Island Place_Keyword: Torrance Place_Keyword: Long Beach Place_Keyword: Huntington Beach Place_Keyword: Newport Beach Place_Keyword: Laguna Beach Place_Keyword: Dana Point Place_Keyword: San Clemente Place_Keyword: Oceanside Place_Keyword: Carlsbad Place_Keyword: Encinitas Place_Keyword: Solana Beach Place_Keyword: San Diego Place_Keyword: Coronado Place_Keyword: Imperial Beach Place_Keyword: Avalon Place: Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS) Place_Keyword: Redondo Canyon Place_Keyword: San Pedro Escarpment Place_Keyword: San Pedro Basin Place_Keyword: Lasuen Knoll Place_Keyword: Carlsbad Canyon Place_Keyword: La Jolla Canyon Place_Keyword: Point Loma Place_Keyword: Coronado Canyon Place_Keyword: San Diego Trough 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 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: O199SC.MCSTracklineMap.png Browse_Graphic_File_Description: Map of MCS tracklines acquired during USGS field activity O-1-99-SC offshore Southern California. Browse_Graphic_File_Type: PNG Data_Set_Credit: Reprocessing efforts were supported by an Interagency Agreement (IAA) between the Bureau of Ocean Energy Management (BOEM) and the U.S. Geological Survey. The authors acknowledge Danny Brothers (USGS) and Mark Leung (BOEM) for their role in coordinating the IAA. The authors also acknowledge the participants of the field activity O-1-99-SC, the crew of the R/V Ocean Olympic and those involved in in survey planning and execution. Native_Data_Set_Environment: SEG-Y reprocessing was conducted in Shearwater’s Reveal seismic software (https://www.shearwatergeo.com/4/reveal-software) version 10.4.2021. Navigation correction used the python package segyio (https://github.com/equinor/segyio). QGIS-LTR (version 3.21, https://www.qgis.org/en/site/) was used to produce the navigation trackline shapefile and preview image. Cross_Reference: Citation_Information: Originator: W.R. Normark Originator: J.A. Reid Originator: R.W. Sliter Originator: D. Holton Originator: C.E. Gutmacher Originator: M.A. Fisher Originator: J.R. Childs Publication_Date: 1999 Title: Cruise Report for 01-99-SC: Southern California Earthquake Hazards Project Other_Citation_Details: Normark, W.R., Reid, J.A., Sliter, R.W., Holton, D., Gutmacher, C.E., Fisher, M., A., and Childs, J.R., 1999, Cruise Report for 01-99-SC: Southern California Earthquake Hazards Project: U.S. Geological Survey Open-File Report 99-560, http://pubs.usgs.gov/of/1999/0560/. Online_Linkage: http://pubs.usgs.gov/of/1999/0560/ Cross_Reference: Citation_Information: Originator: Michael A. Fisher Originator: Victoria E. Langenheim Originator: Craig Nicholson Originator: Holly F. Ryan Originator: Ray W. Sliter Publication_Date: 2000 Title: Recent developments in understanding the tectonic evolution of the Southern California offshore area: Implications for earthquake-hazard analysis Other_Citation_Details: Fisher, M.A., Langenheim, V.E., Nicholson, C., Ryan, H.F., and Sliter, R.W., 2009, Recent developments in understanding the tectonic evolution of the Southern California offshore area: Implications for earthquake-hazard analysis, in Lee, H.J., and Normark, W.R., (eds.) Earth Science in the Urban Ocean: The Southern California Continental Borderland: Geological Society of America Special Papers, v. 454, https://doi.org/10.1130/2009.2454(4.2). Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control was conducted during acquisition. Some seismic profiles have gaps in them due to system crashes or intentional shutdowns as required, under terms of our operating permit, to protect marine mammals. Logical_Consistency_Report: Quality control was conducted during acquisition and processing to ensure consistency of SEG-Y header navigation and seismic-reflection data that matches bathymetry along the tracklines. Navigation data are available as a trackline shapefile in the ‘Data Files’ section. Trackline navigation combines SEG-Y line parts into a single-track line (47 tracklines and 66 SEG-Y files, including parts). 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. Seismic data are unavailable where GI gun failed on Julian Day 162 and where marine mammal observers determined mammals were within the 250-m shutdown radius. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: YoNav system worked well, using GPS input to provide position data every six seconds for 24 hrs/day. The preferred mode of operation was differential GPS, and there were minimal problems with the shore-based reference stations during the survey. Most of the periods without differential GPS were limited to a few minutes or tens of minutes. The logged intervals of degraded positional control generally indicate periods when there were sporadic position determinations that could be in error by as much as 10,000 km, suggesting both bad data input and failure of YoNav to filter out bad data. Further positional error resulted from lost prestack navigation from server crash. Repopulated navigation headers of raw pre-stack data for survey from USGS navigation file /nav/o-1-99-sc.061. The header navigation fix was performed in a python script using the python package segyio (https://github.com/equinor/segyio). We used the start time and end time of each line to extract the data from the navigation file. A parametric interpolation (x and y as a function of time) was done so that an x/y location could be determined for each trace based on time. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Ray W. Sliter Originator: William R. Normark Originator: Christina E. Gutmacher Publication_Date: 2000 Title: Multichannel seismic-reflection data acquired off the coast of southern California-Part A 1997, 1998, 1999, and 2000 Geospatial_Data_Presentation_Form: SEG-Y and shapefile Publication_Information: Publication_Place: online Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2005/1084/ Type_of_Source_Media: online database Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19990605 Ending_Date: 19990617 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: original seismic-reflection data Source_Contribution: seismic shot SEG-Y data and navigation for reprocessing Process_Step: Process_Description: Multichannel seismic-reflection data were acquired using a 35/35 cubic inch double chamber gas injector (GI) gun firing every 12 seconds at 3000 psi and a 24-channel ITI streamer with 10-meter group spacing. Seismic data were recorded with a STRATAVIEW digital recording system in SEG-D format on 2-GB DAT tapes using a 1-millisecond sample rate and a 3-second record length. A 60-Hz notch filer was used. Navigation data was simultaneously recorded in YoNav. SEG-D to SEG-Y conversion was performed at sea on a Sun workstation running ProMax seismic processing software. Source_Used_Citation_Abbreviation: original seismic-reflection data Process_Date: 19990617 Process_Step: Process_Description: Original SEG-Y shot point navigation was lost in a server crash. Navigation was repopulated to the headers of raw pre-stack ASCII ship navigation. The header navigation fix was performed in a python script using segyio (https://github.com/equinor/segyio) where the start time and end time of each line was used extract the data from the navigation file. A parametric interpolation (x and y as a function of time) was done so that an x/y location could be determined for each trace based on time. The GPS position from the navigation file was assumed to be mid-ship. Process_Date: 20191215 Process_Step: Process_Description: Raw pre-stack SEG-Y data was imported into Reveal seismic software (https://www.shearwatergeo.com/4/reveal-software, v. 10.4.2019), where geometry was applied and data were binned at 5-meters. A 15-30-500-600 Hz bandpass filter and trim statics were applied prior to semblance analysis. Moveout velocities were calculated in 300 CMP increments and with with significant geology changes. Prestack predictive deconvolution (0ms gap length, 75 ms operator, 3 percent whitening designed 500ms below the water bottom time and over 21 traces), trim statics applied after NMO using picked velocities and a water column mute were applied prior to stacking. Post-stack phase shift time migration was applied at 80 percent of picked velocities and the water column was muted. Data were exported to SEG-Y format with navigation in standard header byte locations and zipped into O199SC.mcs.segy.zip. CMP navigation was converted from points to a multi-line shapefile in QGIS-LTR (v. 3.21) and zipped into O199SC.mcs.trackline.shapefile.zip. Process_Date: 20200520 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 66 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 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: O199SC.mcs.segy.zip Entity_Type_Definition: Zip archive of seismic shots with time stamp in standard SEG-Y file format Entity_Type_Definition_Source: Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards Detailed_Description: Entity_Type: Entity_Type_Label: O199SC.mcs.trackline.shapefile.zip Entity_Type_Definition: Zip file contains a polyline shapefile (.shp) of the location of each SEG-Y shot point along the navigated tracklines and associated files Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: LINE Attribute_Definition: Number of navigation line Attribute_Definition_Source: Assigned unique line identifier name Attribute_Domain_Values: Unrepresentable_Domain: Producer-asssigned unique line identifier name Overview_Description: Entity_and_Attribute_Overview: Seismic Shots with Time Stamp in standard SEG-Y file format, with trackline navigation presented in polyline shapefile 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: SEG-Y data are available in the zip file O199SC.mcs.segy.zip containing 66 standard SEG-Y format files of seismic shots with time stamp (Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards). A shapefile of the SEG-Y shot-track navigation is available in the zip file O199SC.mcs.trackline.shapefile.zip. 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 (O199SC.mcs.segy.zip) contains the processed seismic data per navigation line. File_Decompression_Technique: The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). Transfer_Size: 1780 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9GR0PWF Access_Instructions: SEG-Y data (O199SC.mcs.segy.zip) can be downloaded using the Network_Resource_Name link and scrolling to the Seismic Data section. Digital_Form: Digital_Transfer_Information: Format_Name: shapefile Format_Version_Number: ArcGIS Pro (version 2.4.1) Format_Information_Content: Zip file contains a shapefile with SEG-Y trackline navigation File_Decompression_Technique: The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). Transfer_Size: 0.6179 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9GR0PWF Access_Instructions: Data (O199SC.mcs.trackline.shapefile.zip) can be downloaded using the Network_Resource_Name link and scrolling to the Seismic Data section. Fees: None. Technical_Prerequisites: Use of SEG-Y data requires specialized software, such as Reveal by Shearwater; 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. Users must have software capable of reading shapefile (.shp) format to use the shot point shapefile. Metadata_Reference_Information: Metadata_Date: 20221115 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