Multichannel sparker and minisparker seismic-reflection data of USGS field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver. 2.0, March 2020)

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Frequently anticipated questions:

What does this data set describe?

Title:
Multichannel sparker and minisparker seismic-reflection data of USGS field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver. 2.0, March 2020)
Abstract:
This data release contains 35 multichannel sparker and 24 multichannel minisparker seismic reflection (MCS) profiles that were collected in November of 2014 from the Catalina and Santa Cruz Basins offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center. Data were collected aboard the University of California’s R/V Robert Gordon Sproul on USGS cruise 2014-645-FA. MCS profiles were collected to assess earthquake and submarine landslide hazards offshore southern California.
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=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.
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.
  1. How might this data set be cited?
    Balster-Gee, Alicia F., Kluesner, Jared W., Brothers, Daniel S., Conrad, James E., and Sliter, Ray W., 20170717, Multichannel sparker and minisparker seismic-reflection data of USGS field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver. 2.0, March 2020): data release DOI:10.5066/F7CV4FW6, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Balster-Gee, Alicia F., Kluesner, Jared W., Brothers, Daniel S., Conrad, James E., and Sliter, Ray W., 2020, Multichannel minisparker, sparker and chirp seismic-reflection data of field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver 2.0, March 2020): 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_mcs_tracklines.png&allowOpen=true (PNG)
    MCS trackline map
  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 time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: 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 each seismic profile location are provided in ASCII position files and are stored in the SEG-Y data trace headers in header bytes 73 and 77.
    2. What coordinate system is used to represent geographic features?
      The map projection used is WGS 1984 UTM Zone 11N.
      Projection parameters:
      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 coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0001
      Ordinates (y-coordinates) are specified to the nearest 0.0001
      Planar coordinates are specified in Meter
      The horizontal datum used is D WGS 1984.
      The ellipsoid used is WGS 1984.
      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: two-way travel time in milliseconds
      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)
    • Alicia F. Balster-Gee
    • Jared W. Kluesner
    • Daniel S. Brothers
    • James E. Conrad
    • Ray W. 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?

Data were acquired to support USGS geologic hazards projects to aide hazard assessment and geologic structure mapping of southern California’s offshore Catalina, Catalina Ridge, San Clemente, and San Diego Trough Fault Zones. These data were collected to update the USGS Quaternary fault database and shaking hazard models developed by the Working Group on 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. Data collection was funded in part by UC Student Ship Funds. Chirp sub-bottom data were collected coincidentally. These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.

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: 25-Nov-2014 (process 1 of 6)
    Seismic-reflection profiles were collected during USGS field activity 2014-645-FA using a 5kJ Delta sparker source or a 700J Joule minisparker source and recorded with a 300-meter, 48-channel Geometrics digital seismic streamer with 6.25m group spacing.
    Date: 30-Jan-2015 (process 2 of 6)
    MCS profiles were processed using SIOSEIS and Seismic Unix. SIOSEIS processing included conversion from SEGD to SEGY, geometry calculation using navigation, 20-1000Hz bandpass filter and CDP gather sorting. Seismic Unix processing included channel rejection, zerophase bandpass filtering, de-spike, butterworth minimum phase filter, NMO correction, DMO correction, pre-stak Stolt migration of CDP gathers, trace balancing, predictive deconvolution, trace mix, and AGC. Navigation was converted to UTM zone 11N and smoothed over 50m using a local regression algorithm in MatLab. Note that the repeating navigation at the beginning of each line is an artifact of the navigation smoothing and doesn’t affect the overall positional accuracy of the dataset.
    Date: 01-Feb-2020 (process 3 of 6)
    For version 2.0 of this data release, additional lines of data were added. No original data were changed. The metadata file was revised to better describe the collection and processing of both the original and newly added data, all of which were handled in the same manner. The title of the data and the overall data release was changed to better reflect the geographic location of the data, and the authorship and ranking was revised.
    Date: 31-May-2020 (process 4 of 6)
    Typo in Longitude of Central Meridian (longcm) tag was corrected. No data were changed. 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 5 of 6)
    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
    Date: 13-Oct-2021 (process 6 of 6)
    Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@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?
    Identified as the best available version
  2. How accurate are the geographic locations?
    Position data were provided by a Differential Global Positioning System (DGPS) navigation receiver. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.
  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.
  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?
    Multichannel seismic-reflection data were collected during USGS field activity 2014-645-FA using a 5kJ Delta sparker source for lines 1-17 and a 700J SIG-2mile minisparker source for lines 18-40. MCS data were recorded with a Geometrics 48-channel, 300-meter digital streamer. Depth control birds were used to fly the streamer at consistent depths below the sea surface. 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
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.
  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

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? 2014-645-FA_mcs.zip This zip file contains multichannel seismic-reflection (SEG-Y) data collected during USGS field activity 2014-645-FA. These data are divided up and presented by navigation line, as reflected in the individual file names.
  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?
  5. What hardware or software do I need in order to use the data set?
    Use of SEG-Y data requires specialized software, such as Reveal by Shearwater Geophysical; 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.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2021
Metadata author:
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
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7CV4FW6/2014-645-FA_mcs_metadata.faq.html>
Generated by mp version 2.9.50 on Thu Oct 14 14:47:20 2021