Reprocessed multichannel seismic reflection data acquired offshore Southern California during USGS field activity L-4-90-SC

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Travis Alongi
Originator: Alicia F. Balster-Gee
Originator: Jared W. Kluesner
Originator: Ray W. Sliter
Publication_Date: 20230809
Title:
Reprocessed multichannel seismic reflection data acquired offshore Southern California during USGS field activity L-4-90-SC
Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9FOES4K
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested Citation: Alongi, T., Balster-Gee, A.F., Kluesner, J.W., Sliter, R.W., 2023, Reprocessed multichannel seismic reflection data acquired offshore Southern California during USGS field activity L-4-90-SC: U.S. Geological Survey data release, https://doi.org/10.5066/P9FOES4K.
Online_Linkage: https://doi.org/10.5066/P9FOES4K
Description:
Abstract:
Multichannel seismic (MCS) data were collected by the U.S. Geological Survey (USGS) in 1990 in the California Continental Borderland (USGS field activity L490SC). 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 history 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=L490SC
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: 19900509
Ending_Date: 19900525
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: -121.090570
East_Bounding_Coordinate: -117.387666
North_Bounding_Coordinate: 31.190785
South_Bounding_Coordinate: 35.321160
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:dcb63f18-fef7-44af-8e36-da9b6b195c45
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: Coronado Canyon
Place_Keyword: San Diego Trough
Place_Keyword: San Nicolas Basin
Place_Keyword: Emery Basin
Place_Keyword: San Clemente Basin
Place_Keyword: East Cortes Basin
Place_Keyword: Cortes Bank
Place_Keyword: Tanner Bank
Place_Keyword: Tanner Basin
Place_Keyword: Santa Cruz Basin
Place_Keyword: Arguello Terrace
Place_Keyword: Santa Lucia Bank
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Point Loma
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: L490SC.preview.png
Browse_Graphic_File_Description:
Map of MCS tracklines acquired during USGS field activity L-4-90-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 L-4-90-SC, the crew of the R/V S.P. Lee 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: R.G. Bohannon
Originator: S.L. Eittreim
Originator: J.R. Childs
Publication_Date: 1999
Title:
Cruise Report of R/V S.P. Lee, Leg 4, 1990, California continental borderland: U.S. Geological Survey Open-File Report 90-0502
Other_Citation_Details:
Bohannon, R.G., Eittreim, S.L., and Childs, J.R., 1990, Cruise Report of R/V S.P. Lee, Leg 4, 1990, California continental borderland: U.S. Geological Survey Open-File Report 90-0502, 10 p., http://pubs.usgs.gov/of/1990/0502/report.pdf.
Online_Linkage: http://pubs.usgs.gov/of/1990/0502/report.pdf
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 (32 tracklines and 32 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 equipment failed and where marine mammal observers determined mammals were within the 250-m shutdown radius.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The primary underway navigational sensor was Loran-C operated in the range-range mode. Loran-C calibration factors were derived from GPS solutions when GPS coverage was adequate(approximately 12 hours per day). The absolute accuracy of LORAN-C varies from 0.10 to 0.25 nmi (185 to 463 m). Repeatable accuracy is much greater, typically from 60 to 300 ft (18 to 91 m) (COMDTPUB P16562.6, "LORAN-C Users Handbook", 1992, https://chetaero.files.wordpress.com/2016/11/loran-c_users_handbook_entire.pdf). Further positional error may have been introduced from assigning receiver locations and CMP binning.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: P.E. Hart
Publication_Date: 2016
Title: namss.L-4-90-SC.mcs.airgun.zip
Geospatial_Data_Presentation_Form: SEG-Y
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey
Online_Linkage: https://walrus.wr.usgs.gov/namss/survey/l-4-90-sc/
Type_of_Source_Media: online database
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19900509
Ending_Date: 19900525
Source_Currentness_Reference: ground condition at time data were collected
Source_Citation_Abbreviation: original seismic-reflection data
Source_Contribution: seismic shot SEG-Y data for reprocessing
Process_Step:
Process_Description:
Multichannel seismic-reflection data were acquired with a 10-airgun array seismic source with a combined chamber volume of 2424 cubic inches. The data were recorded using a 48-channel analog streamer which were spaced at 50 meter intervals, the furthest offsets was 2.4 kilometers aft of the airgun array. The length of the streamer and the 50 meter shot interval results in a fold of 20 traces or greater. The seismic traces were recorded at 2 ms sample rate with a total record length of 12 seconds.
Source_Used_Citation_Abbreviation: original seismic-reflection data
Process_Date: 19920520
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 The seismic traces were detrended and the applied tape delay was removed. Corrections were applied to the SEG-Y headers which were recorded in reverse channel order and offsets were corrected to positive values. The preceding steps were applied to perform frequency - wavenumber analysis, with which noise and aliased signal were isolated and removed in Fourier space leaving the desired reflection signal. The raw data was quality controlled and 4 noisy channels at the furthest offsets were removed. The data was despiked, cleaned and trim statics were applied. Deconvolution wass done prestack and removed the source signature from the geologic reflections in order to produce crisp, collapsed, and high-resolution imaging. The deconvolution operator is an inverse filter that is computed statistically on a per-channel basis. The detailed 2D subsurface velocity structure was determined in a semblance analysis workflow. The velocity field was used to correctly move out the data before stacking to increase resolution, suppress random noise and reduce contamination from the sea surface multiple. Post-stack time migration was applied at 85 percent of the picked velocity for this data set. Finally, the water column was muted and the bottom edge of the data were muted. Data were exported to SEG-Y format with navigation in standard header byte locations and zipped into L490SC.mcs.segy.zip. CMP navigation was converted from points to a multi-line shapefile in QGIS-LTR (v. 3.21) and zipped into L490SC.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: 32
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS 1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257224
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: L490SC.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: L490SC.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-assigned 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 L490SC.mcs.segy.zip containing 32 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 L490SC.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 (L490SC.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: 489.1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9FOES4K
Access_Instructions:
SEG-Y data (L490SC.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: 1.2
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9FOES4K
Access_Instructions:
Data (L490SC.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: 20230809
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
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9FOES4K/L490SC.metadata.html>
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