Reprocessed legacy seismic-reflection data from USGS field activity B-1-72-SC collected offshore southern California

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Daniel J. Kennedy
Originator: Alicia F. Balster-Gee
Originator: Ray W. Sliter
Originator: Jared W. Kluesner
Publication_Date: 20220428
Title:
Reprocessed legacy seismic-reflection data from USGS field activity B-1-72-SC collected offshore southern California
Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9EK7CG3
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/P9EK7CG3
Larger_Work_Citation:
Citation_Information:
Originator: Daniel J. Kennedy
Originator: Alicia F. Balster-Gee
Originator: Ray W. Sliter
Originator: Jared W. Kluesner
Publication_Date: 2022
Title:
Reprocessed legacy seismic-reflection data from USGS field activity B-1-72-SC collected offshore central and southern California
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9EK7CG3
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9EK7CG3
Description:
Abstract:
Seismic-reflection data were collected offshore southern California in 1972 aboard the USNS Bartlett (USGS Field Activity B-1-72-SC). In 2021 these legacy data were reprocessed to improve accuracy and geologic resolvability of California’s continental margin.
Purpose:
Data were acquired to map geologic structure of central and southern California’s continental margin. The reprocessed dataset increases positional accuracy and enhances the 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 activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=B172SC https://cmgds.marine.usgs.gov/fan_info.php?fan=B272SC https://cmgds.marine.usgs.gov/fan_info.php?fan=B372SC https://cmgds.marine.usgs.gov/fan_info.php?fan=B472SC
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The effort to rescue and reprocess these legacy seismic-reflection data profiles was supported by Pacific Gas and Electric (PG&E) through a USGS Cooperative Research and Development Agreement (CRADA). Stu Nishenko is thanked for providing copies of the original analog profiles and navigation.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19721109
Ending_Date: 19721201
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: -120.6839
East_Bounding_Coordinate: -117.38731
North_Bounding_Coordinate: 34.2616
South_Bounding_Coordinate: 32.40505
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:d02f18cf-7558-4124-ae47-7d079d5eb2fc
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation
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: seismic reflection profiling
Theme_Keyword: submarine landslides
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: Pacific Ocean
Place_Keyword: Santa Barbara Channel
Place_Keyword: Channel Islands
Place_Keyword: San Diego
Place:
Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Catalina Basin
Place_Keyword: Santa Cruz Basin
Place_Keyword: Catalina Canyon
Place_Keyword: Santa Barbara Channel
Place_Keyword: Hueneme Canyon
Place_Keyword: Santa Monica Canyon
Place_Keyword: San Nicolas Basin
Place_Keyword: San Diego Trough
Place_Keyword: Tanner Basin
Place_Keyword: Tanner Bank
Place_Keyword: Cortes Bank
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: B-1-72-SC_Tracklines_UTM11N.png
Browse_Graphic_File_Description:
Map of seismic-reflection tracklines from B-1-72-SC falling within the UTM zone 11N geographic area of southern California.
Browse_Graphic_File_Type: PNG
Native_Data_Set_Environment: SEGY Rev 1
Cross_Reference:
Citation_Information:
Originator: Peter J. Triezenberg
Originator: Patrick E. Hart
Originator: Jonathan R. Childs
Publication_Date: 2016
Title:
National Archive of Marine Seismic Surveys (NAMSS): A USGS data website of marine seismic reflection data within the U.S. Exclusive Economic Zone (EEZ)
Other_Citation_Details:
Triezenberg, P.J., Hart, P.E., and Childs, J.R., 2016, National Archive of Marine Seismic Surveys (NAMSS): A USGS data website of marine seismic reflection data within the U.S. Exclusive Economic Zone (EEZ): U.S. Geological Survey data release, https://doi.org/10.5066/F7930R7P.
Online_Linkage: https://walrus.wr.usgs.gov/namss/survey/b-1-72-sc/
Cross_Reference:
Citation_Information:
Originator: H. Gary Greene
Originator: Eli A. Silver
Originator: Roland E. von Huene
Publication_Date: 1975
Title:
Seismic reflection profiles November 1972 cruise, USNS Bartlett, offshore Central and southern California
Other_Citation_Details:
This USGS Open-File Report contains the hand-written seismic logs (field notes) from the acquisition cruise.
Online_Linkage: https://doi.org/10.3133/ofr75121
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Scanned copies of the original seismic-reflection data from paper rolls were provided by PG&E for this project. As these are scanned copies, an unknown loss of resolution may have occurred. These scanned copies of the original paper records are identified as the best available version and from which modern (c. 2021-2022) reprocessing of this legacy data occurred.
Logical_Consistency_Report:
Navigation fixes are only every 30 minutes to 1 hour using a LORAN navigation system.
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:
Navigation fixes are only every 30 minutes to 1 hour using a LORAN navigation system that has a horizontal accuracy within tens of miles. Reprocessed data interpolates position for each trace using the original navigation fixes.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Depths shown in seismic data files are in milliseconds (round trip travel time) and are referenced to sea level.
Lineage:
Process_Step:
Process_Description:
Original seismic-reflection data were acquired during a November 1972 cruise on the USNS Bartlett offshore of central and southern California. Profiles were collected using a sparker sound source powered between 120 and 160 kJ and recorded using an analog hydrophone streamer with navigation fixes taken at 30- to 60-minute intervals using a LORAN navigation system. Data were written to paper rolls.
Process_Date: 19721210
Process_Step:
Process_Description:
Scanned copies of the original paper rolls were scanned to tiff and jpeg digital format. These images have subsequently been made available in the National Archive of Marine Seismic Surveys (NAMSS; Triezenburg and others 2016).
Process_Date: 20110817
Process_Step:
Process_Description:
Tiff image line parts were cropped, straightened, transposed, and merged by navigation line using Adobe Photoshop. Using Image2segy software (https://gma.icm.csic.es/ca/image2segy), raster seismic images were transformed to geo-referenced SEG-Y profiles using the original 30– to 60-minute navigation fixes. Assuming a survey speed of 8 knots (4 meters per second), shots were interpolated every 1.5 seconds resulting in 6-meter spacing between successive shots. Record delays were written to SEG-Y headers.
Process_Date: 20210310
Process_Step:
Process_Description:
The following process steps were applied using Shearwater’s Reveal seismic software (https://www.shearwatergeo.com/4/reveal-software): delay recording time shift, water column mute, bottom mute 2700 ms below the water bottom, time migration at a constant 1600m/s, 3 trace median gather filter, 0-10-150-200 Hz Bandpass filter, and a final water column mute and bottom mute.
Process_Date: 20220310
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:
B-1-72-SC_UTM11N.zip contains reprocessed seismic-reflection (SEG-Y) data originally collected in 1972. The 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 reprocessed seismic-reflection data per navigation line from scans of the original paper records
File_Decompression_Technique:
Winzip, 7-zip, or Winrar are free software that will open .zip files
Transfer_Size: 1012.4
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9EK7CG3
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: 20220428
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_P9EK7CG3/B-1-72-SC_SoCal_UTM11N_metadata.html>
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