Multichannel minisparker seismic-reflection data of field activity 2014-645-FA; Santa Cruz and Catalina Basins, offshore southern California from 2014-11-12 to 2014-11-25

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Frequently anticipated questions:


What does this data set describe?

Title:
Multichannel minisparker seismic-reflection data of field activity 2014-645-FA; Santa Cruz and Catalina Basins, offshore southern California from 2014-11-12 to 2014-11-25
Abstract:
This data release contains processed, high-resolution multichannel seismic (MCS) reflection data collected in 2014 to explore marine geologic hazards offshore of southern California. Specific targets include the San Clemente, Catalina, and Catalina Ridge faults in the Catalina Basin, and a submarine landslide complex in the Santa Cruz Basin. The survey took place in the Catalina and Santa Cruz Basins, south of the southern California Channel Islands between Santa Catalina Island and San Clemente Island, California. The data were collected aboard the Scripps Institution of Oceanography R/V Robert Gordon Sproul. The seismic-reflection data were acquired using a SIG 2mille minisparker and a 48-channel Geometrics GeoEel digital streamer. Subbottom acoustic penetration spanned up to several hundred meters, variable by location. This data release contains processed digital SEG-Y.
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=2014-645-FA . Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Sliter, Ray W., Conrad, James E., Brothers, Daniel S., and Balster-Gee, Alicia F., 2017, Multichannel minisparker seismic-reflection data of field activity 2014-645-FA; Santa Cruz and Catalina Basins, offshore southern California from 2014-11-12 to 2014-11-25: data release DOI:10.5066/F7CV4FW6, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Sliter, Ray W., Conrad, James E., Brothers, Daniel S., and Balster-Gee, Alicia F., 2017, Publication_Date: Minisparker and chirp seismic-reflection data of field activity 2014-645-FA; offshore Santa Barbara, southern California from 2014-11-12 to 2014-11-25: data release DOI:10.5066/F7CV4FW6, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -120.44300
    East_Bounding_Coordinate: -117.26803
    North_Bounding_Coordinate: 34.22542
    South_Bounding_Coordinate: 32.75509
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58d99b75e4b0543bf7fc64d3?name=2014-645-FA_minisparker.jpg&allowOpen=true (JPEG)
    index map showing location of survey lines
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Nov-2014
    Ending_Date: 25-Nov-2014
    Currentness_Reference:
    ground condition at the time the data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: minisparker seismic-reflection data in SEG-Y format
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      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.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 11
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5.0
      Ordinates (y-coordinates) are specified to the nearest 5.0
      Planar coordinates are specified in Meters
      The horizontal datum used is D_WGS_84.
      The ellipsoid used is WGS_84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      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
  7. How does the data set describe geographic features?
    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

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Ray W. Sliter
    • James E. Conrad
    • Daniel S. Brothers
    • Alicia F. Balster-Gee
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Ray W. Sliter
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geophysicist
    2885 Mission Street
    Santa Cruz, CA
    USA

    831-460-7427 (voice)
    831-427-4748 (FAX)
    rsliter@usgs.gov

Why was the data set created?

The U.S. Geological Survey (USGS) collected high-resolution multichannel minisparker and single-channel chirp seismic-reflection data in November 2014, offshore of southern California, in the Catalina and Santa Cruz Basins, south of the southern California Channel Islands between Santa Catalina Island and San Clemente Island, California. The survey was designed to image faults and folds associated with movement on the numerous faults offshore of southern California, including the Catalina, Catalina Ridge, San Clemente, San Diego Trough, and several other unnamed fault zones. These 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. In addition, the survey imaged a large landslide complex in Santa Cruz Basin in order to determine causes and age of seafloor failure. This work was funded by the USGS Coastal and Marine Geology Program’s Catastrophic Hazards Project. The seismic-reflection profiles 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.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 2)
    Seismic-reflection data were collected using a minisparker system that creates an acoustic signal by discharging a 700-Joule, high-voltage electrical pulse between electrodes and a ground that generates a frequency spectrum roughly between 200 and 1,600 Hz. Data were acquired using a 48-channel (6.25 m group spacing) Geometrics GeoEel digital hydrophone streamer and recorded in SEG-Y 32-bit floating point.
    Date: 2015 (process 2 of 2)
    MCS Seismic-reflection SEG-Y files were processed using SeismicUnix, an open source seismic utilities package (see: http://www.cwp.mines.edu/cwpcodes/). The following processing steps were applied to each line: 60–900 Hz zero phase bandpass filter, trace edit, fk-filter, common depth point sort, normal moveout correction (1500 m/s constant velocity), dip moveout correction, pre-stack Stolt migration, predictive deconvolution, and stack.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Identified as best available version.
  2. How accurate are the geographic locations?
    Position data were provided by a Differential Global Positioning System (DGPS) navigation receiver. The Geometrics GeoEel digital hydrophone streamer and sparker electrodes were deployed 20 m behind the DGPS receiver. Layback is estimated to be 20 m plus/minus 5 m. No layback correction from the DGPS receiver position was applied to navigation data.
  3. How accurate are the heights or depths?
    Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Vertical resolution is approximately 1 millisecond and vertical accuracy is approximately plus/minus 4 milliseconds depending on sea state.
  4. Where are the gaps in the data? What is missing?
    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.
  5. How consistent are the relationships among the observations, including topology?
    High-resolution Multichannel seismic (MCS) reflection data were collected during USGS cruise 2014-645-FA using a 48-channel (6.25 m group spacing) Geometrics GeoEel digital hydrophone streamer, 700 Joule Applied Acoustics power supply and SIG minisparker sound source. Quality control was conducted during the collection process.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
None. USGS-authored or -produced data and information are in the public domain.
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? 2014-645-FA_minisparker.zip – this zip file contains migrated high-resolution multichannel seismic-reflection (SEG-Y) data collected during PCMSC field activity 2014-645-FA. The data are divided up and presented by navigation line, as reflected in the individual file name(s).
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 11-Apr-2017
Metadata author:
Ray W. Sliter
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geophysicist
2885 Mission Street
Santa Cruz, CA
USA

831-460-7427 (voice)
831-427-4748 (FAX)
rsliter@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/2014-645-FA_minisparker_meta.faq.html>
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