Swell-filtered, high-resolution seismic-reflection data collected between Point Sal to Refugio State Beach (southern California) during field activity 2014-632-FA from 07/17/2014 to 08/02/2014

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Frequently anticipated questions:


What does this data set describe?

Title:
Swell-filtered, high-resolution seismic-reflection data collected between Point Sal to Refugio State Beach (southern California) during field activity 2014-632-FA from 07/17/2014 to 08/02/2014
Abstract:
This dataset includes swell-filtered, high-resolution seismic-reflection data, collected by the U.S. Geological Survey (USGS) in 2014, between Point Sal and Refugio State Beach in southern California.
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=2014-632-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?
    Johnson, Samuel Y., Hartwell, Stephen R., and Beeson, Jeffrey W., 2016, Swell-filtered, high-resolution seismic-reflection data collected between Point Sal to Refugio State Beach (southern California) during field activity 2014-632-FA from 07/17/2014 to 08/02/2014: data release DOI:10.5066/F7SX6BCD, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Johnson, Samuel Y., Hartwell, Stephen R., and Beeson, Jeffrey W., 2016, Marine geophysical data—Point Sal to Refugio State Beach, southern California: data release dx.doi:10.5066/F7SX6BCD, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -120.808267
    East_Bounding_Coordinate: -120.036534
    North_Bounding_Coordinate: 34.989906
    South_Bounding_Coordinate: 34.240526
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/583dd91ee4b088b77f51be4f?name=2014_632_FA_Thumbnail.png&allowOpen=true (GIF)
    Trackline map of 2014-632-FA
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 17-Jul-2014
    Ending_Date: 02-Aug-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?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      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: 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)
    • Samuel Y. Johnson
    • Stephen R. Hartwell
    • Jeffrey W. Beeson
  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: Stephen Hartwell
    Geologist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7814 (voice)
    (831) 427-4748 (FAX)
    shartwell@usgs.gov

Why was the data set created?

These data were acquired to support the California Seafloor Mapping Program and USGS geologic hazards projects to aide hazard assessment of southern Hosgri fault and connections to faults in Transverse Ranges and Santa Barbara Channel. 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: Jul-2014 (process 1 of 3)
    Seismic-reflection data were collected using a minisparker system that creates an acoustic signal by discharging an electrical pulse between electrodes and a ground that generates a frequency spectrum roughly between 200 and 1,600 Hz. At boat speeds of 4 to 4.5 nm/hour, seismic traces were collected roughly every 1 to 2 meters. Water depths were generally between 50 m and 150 m, but as shallow as 10 meters near the shoreline, and as deep as 480 m for profiles crossing the Santa Barbara basin. Acoustic pulses were generated at 0.5-second intervals on most profiles; a 1-second interval was used on the few profiles collected in deeper water. Standard SEG-Y files were generated using a Triton Subbottom Logger (SBL).
    Date: 2014 (process 2 of 3)
    Seismic-reflection SEG-Y files were corrected for swell effects using Sioseis software (see: http://sioseis.ucsd.edu/procs.html). SEG-Y header data were normalized using the "header" Sioseis processes, and a band pass filter was applied. Next, each SEG-Y file was displayed using Seisee (available at http://www.dmng.ru/en/freeware.html) and up to 16 water-bottom time/shot-point pairs where recorded to guide the automated water-bottom picker used to mute the water column. Finally, a swell filter was applied to the data, and the results were exported as a new SEG-Y file. The following parameters were used for each step in the process:
    
    header: fno 0 lno 9999999 ftr 0 ltr 99999 l4 = l3
    
    header2: fno 0 lno 99999 ftr 0 ltr 99999 r59 = r50
    
    filter: ftype 0 pass 160 1600
    
    water bottom picker: solrat between 2-5 ses 0  0.002 sel 0  0.5
    
    swell: n 35
    
    Date: 24-Jan-2017 (process 3 of 3)
    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
  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?
    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. Some seismic profiles have gaps in them due to system crashes, mammal shutdowns or hardware maintenance. 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?
    All subbottom data were collected during USGS cruise 2014-632-FA using a minisparker system. 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(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)
  2. What's the catalog number I need to order this data set? Corrected_SGY.zip – this zip file contains swell-corrected high-resolution seismic-reflection data collected during PCMSC field activity 2014-632-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?
  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 ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; or VISTA by Seismic Image Software.

Who wrote the metadata?

Dates:
Last modified: 24-Jan-2017
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: Stephen R. Hartwell
2885 Mission Street
Santa Cruz, CA
US

831-460-7814 (voice)
831-427-4748 (FAX)
shartwell@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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