High-resolution marine seismic reflection data from the San Francisco Bay area, collected in 1997 during USGS Field Activity J4-97-SF

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Frequently anticipated questions:

What does this data set describe?

Title:
High-resolution marine seismic reflection data from the San Francisco Bay area, collected in 1997 during USGS Field Activity J4-97-SF
Abstract:
Between 1993 and 1997, the U.S. Geological Survey acquired high-resolution, marine seismic-reflection profile data across submerged portions of known and inferred upper crustal fault zones throughout the greater San Francisco Bay area. This particular dataset was acquired in 1997 during USGS Field Activity J4-97-SF using the vessel David Johnston. The dataset includes navigational data in ASCII format, gif images of the seismic-profile lines, and seismic data in industry-standard SEG-Y format. These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean (http://www.virtualocean.org/) earth science exploration and visualization applications.
Supplemental_Information:
Additional information about the USGS field activity from which these data were collected may be found at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=J497SF
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 dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Childs, Jonathan R., Hart, Patrick, Bruns, Terry R., Marlow, Michael S., and Sliter, Ray, 2000, High-resolution marine seismic reflection data from the San Francisco Bay area, collected in 1997 during USGS Field Activity J4-97-SF: Open-File Report 2000-0494, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Childs, Jonathan R., Hart, Patrick, Bruns, Terry R., Marlow, Michael S., and Sliter, Ray, 2019, High-resolution marine seismic reflection data from the San Francisco Bay area: Open-File Report 2000-0494, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.29
    East_Bounding_Coordinate: -122.23
    North_Bounding_Coordinate: 37.69
    South_Bounding_Coordinate: 37.61
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Mar-1997
    Ending_Date: 06-Mar-1997
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: ASCII, gif, SEG-Y
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Seismic-reflection data are available in SEG-Y format, which includes self-contained headers with attribute information; navigation data are available in ASCII format with header information; profiles are available in gif format.
    Entity_and_Attribute_Detail_Citation: Producer

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jonathan R. Childs
    • Patrick Hart
    • Terry R. Bruns
    • Michael S. Marlow
    • Ray Sliter
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Marine seismic reflection data are used to image and map sedimentary and structural features of the seafloor and subsurface. These data are useful in mapping faults (such as the San Andreas and Hayward Faults) where they pass under the waters of the San Francisco Bay, and in assessing other submarine geologic characteristics and features.

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: 05-Oct-1999 (process 1 of 4)
    Seismic reflection profiles are acquired by means of an acoustic source (usually generated electromagnetically or with compressed air), and a hydrophone or hydrophone array. Both elements are typically towed in the water behind a survey vessel. The sound source emits a short acoustic pulse, which propagates through the water and sediment columns. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), and detected at the hydro-phone. This process is repeated at intervals ranging between 250 milliseconds and 10 seconds depending on the source type. Users are advised to read the Instrumentation and Data Processing sections of the accompanying Open-File Report for specifics to each data-collection cruise. Seismic data are stored in SEG-Y format, which is a standard digital format that can be read and manipulated by most seismic-processing software packages. The SEG-Y file format includes a 3200-byte descriptive header that should contain detailed information regarding the data acquisition and processing parameters. The navigation data are stored in flat ASCII files as latitude and longitude values that can be used to plot track maps of the seismic profiles at any scale or map projection desired. The data and format of the navigation files are described in the file prologue. Gif images of the seismic-reflection profiles are also available. Person who carried out this activity:
    Jonathan R. Childs
    U.S. Geological Survey
    geophysicist
    Mail Stop 999 345 Middlefield Rd.
    Menlo Park, CA

    650-329-5195 (voice)
    jchilds@usgs.gov
    Date: 24-Jan-2017 (process 2 of 4)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 02-Jan-2020 (process 3 of 4)
    Edits were made to bring the metadata up to current PCMSC standards including information about the accompanying Open-File Report, standardizing authors' names, adding a doi# link, correcting typos, refining keywords, and using current access and distribution liability statements. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    United States

    831-460-7545 (voice)
    scochran@usgs.gov
    Date: 19-Oct-2020 (process 4 of 4)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  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 accompanying Open-File Report carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Unknown

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Clint Steele
    Mail Stop 999 345 Middlefield Rd.
    Menlo Park, CA

    650-329-5055 (voice)
    csteele@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable SEG-Y data, navigation information in ASCII format, gif images of seismic-reflection profiles
  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: 19-Oct-2020
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/SeriesReports/OFR/OFR_2000-0494/J4-97-SF.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:52 2021