Chirp sub-bottom data of USGS field activity 2018-645-FA collected in the Santa Barbara Channel in July of 2018

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Balster-Gee, Alicia F., Kluesner, Jared W., and Brothers, Daniel S., 20200706, Chirp sub-bottom data of USGS field activity 2018-645-FA collected in the Santa Barbara Channel in July of 2018: data release DOI:10.5066/P93M68CN, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/P93M68CN
   • https://www.sciencebase.gov/catalog/item/5ebeda9e82ce476925e5d742

   This is part of the following larger work.
   Balster-Gee, Alicia F., Kluesner, Jared W., and Brothers, Daniel S., 2020, Multichannel minisparker seismic-reflection and chirp sub-bottom data of USGS field activity 2018-645-FA collected in the Santa Barbara Channel in July of 2018: data release DOI:10.5066/P93M68CN, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P93M68CN

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -120.37987055
   East_Bounding_Coordinate: -119.87584223
   North_Bounding_Coordinate: 34.44965989
   South_Bounding_Coordinate: 34.17035646
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/5ebeda9e82ce476925e5d742?name=2018-645-FA_Chirp_trackline_map.png&allowOpen=true (PNG)

   Map of chirp tracklines collected during field activity 2018-645-FA.

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 09-Jul-2018

   Ending_Date: 18-Jul-2018

   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 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
      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
2. Who also contributed to the data set?

   We thank Rachel Marcuson, Daniel Powers, Gerry Hatcher and Timothy Elfers for assistance with survey planning and data acquisition.

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 geologic hazards projects to aide hazard assessment of shallow faulting, slope stability, and submarine landslides along the western 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: 20-May-2019 (process 1 of 2)

   Chirp sub-bottom data were collected using an Edgetech-512i sub-bottom profiler. Data were corrected for sub-bottom profiler tow depth, converted to envelope, swell corrected and muted above the seafloor. Navigation was converted from seconds of arc to UTM zone 11N.

   Date: 19-Oct-2020 (process 2 of 2)

   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?
   Identified as best available version
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 accuracy tests were conducted, but quality control was conducted during data 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? 2018-645-FA_chirp.zip contains chirp sub-bottom (SEG-Y) data collected during USGS field activity 2018-645-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?
   • Availability in digital form:

     Data format:	Zip file contains the raw seismic data per navigation line. in format SEG-Y (version SEGY-Y rev 1) Size: 24.9
     Network links:	https://www.sciencebase.gov/catalog/file/get/5ebeda9e82ce476925e5d742 https://www.sciencebase.gov/catalog/item/5ebeda9e82ce476925e5d742 https://doi.org/10.5066/P93M68CN

   • Cost to order the data: None.

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: 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

831-427-4747 (voice)

pcmsc_data@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)