Multichannel minisparker data of USGS field activity 2017-612-FA collected in Puget Sound, Washington in February of 2017

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Frequently anticipated questions:


What does this data set describe?

Title:
Multichannel minisparker data of USGS field activity 2017-612-FA collected in Puget Sound, Washington in February of 2017
Abstract:
High-resolution multichannel minisparker seismic-reflection data were collected by the U.S. Geological Survey and the University of Washington in February of 2017 west of Seattle in Puget Sound and in Lake Washington, Washington. Data were collected aboard University of Washington’s R/V Clifford A. Barnes during USGS field activity 2017-612-FA using a 500 Joule SIG 2-mille minisparker sound source and recorded on a 48 channel Geometrics digital hydrophone streamer. Sub-bottom acoustic penetration spans several hundreds of meters and is variable by location.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=2017-612-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?
    Balster-Gee, Alicia F., Watt, Janet T., Roland, Emily C., Kluesner, Jared W., Brothers, Daniel S., Bennett, Scott, Hart, Patrick E., Myers, Emma K., Pszczola, Kevin, Walton, Maureen A.L., and Sherrod, Brian, 20210122, Multichannel minisparker data of USGS field activity 2017-612-FA collected in Puget Sound, Washington in February of 2017: data release DOI:10.5066/P9GWF28U, 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., Watt, Janet T., Roland, Emily C., Kluesner, Jared W., Brothers, Daniel S., Bennett, Scott, Hart, Patrick E., Myers, Emma K., Pszczola, Kevin, Walton, Maureen A.L., and Sherrod, Brian, 2020, Multichannel minisparker, multichannel boomer, and chirp seismic-reflection data of USGS field activity 2017-612-FA collected in Puget Sound and Lake Washington in February of 2017: data release DOI:10.5066/P9GWF28U, 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: -122.577632
    East_Bounding_Coordinate: -122.229492
    North_Bounding_Coordinate: 48.013242
    South_Bounding_Coordinate: 47.501456
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5f9aecc6d34e198cb78b8871?name=2017-612-FA_PugetSound_Trackline_Map.png&allowOpen=true (PNG)
    Map of multichannel minisparker tracklines collected during USGS field activity 2017-612-FA.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Feb-2017
    Ending_Date: 28-Feb-2017
    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 stored in the SEG-Y data trace headers in header bytes 81 and 85.
    2. What coordinate system is used to represent geographic features?
      The map projection used is WGS 1984 UTM Zone 10N.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0
      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
      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)
    • Alicia F. Balster-Gee
    • Janet T. Watt
    • Emily C. Roland
    • Jared W. Kluesner
    • Daniel S. Brothers
    • Scott Bennett
    • Patrick E. Hart
    • Emma K. Myers
    • Kevin Pszczola
    • Maureen A.L. Walton
    • Brian Sherrod
  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 the USGS Coastal and Marine Hazards and Resources Program’s earthquake, tsunami, and landslide active margin field studies to aide hazard assessment of the Seattle Fault zone in central Puget Sound and Lake Washington. Data were collected to characterize recent deformation and estimate earthquake recurrence on the Seattle Fault zone. 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: 20-Jun-2017 (process 1 of 1)
    Multichannel minisparker seismic-reflection data were collected using a 48-channel Geometrics digital hydrophone streamer and a 500-Joule SIG 2-mille minisparker sound source. Processing steps include: conversion from SEG-D to SEGY format, geometry, trace kills, bandpass filter, FK filter of Ferry noise, velocity analysis, AGC, trace balance, spherical divergence gain, normal moveout, minimum phase Butterworth filter (80-550 Hz), stack, time varying post-stack deconvolution, bandpass filter, migration and water column mute. Navigation was converted from seconds of arc to UTM zone 10N.
  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?
    Quality control was conducted during data acquisition and quality was assured during data processing
  2. How accurate are the geographic locations?
    Estimated to be no less than 3 m due to total propagated uncertainties of navigation as well as data processing.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted.
  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?
    No formal logical consistency tests were conducted, but quality control was conducted during acquisition.

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? 2017-612-FA_PugetSound_mcs.zip contains multichannel minisparker seismic reflection (SEG-Y) data collected during USGS field activity 2017-612-FA. The 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: 22-Jan-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)

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