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

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?
   Johnson, Samuel Y., Hartwell, Stephen R., and Beeson, Jeffrey W., 2016, Raw, high-resolution seismic-reflection data collected between Point Sal and 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, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7SX6BCD
   • https://www.sciencebase.gov/catalog/item/5ee3e69182ce3bd58d7e1e4a

   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 DOI:10.5066/F7SX6BCD, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7SX6BCD

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/5ee3e69182ce3bd58d7e1e4a?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: SEG-Y
   

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 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: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   831-427-4747 (voice)

   pcmsc_data@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 4)

   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). Person who carried out this activity:
   

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: Stephen R. Hartwell

   Geologist

   2885 Mission Street

   Santa Cruz, CA
   

   US

   831-460-7814 (voice)

   831-427-4748 (FAX)

   shartwell@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: 12-Jun-2020 (process 3 of 4)

   Data and metadata files were moved to a different location on ScienceBase, resulting in a change of ID number in the Online_Linkage and Network_Resources URLs of the metadata. In addition, edits were made as needed to bring the metadata up to current PCMSC standards including standardizing doi# links, correcting typos, and refining keywords. 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?
   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? This zip file contains uncorrected high-resolution seismic-reflection data collected during PCMSC field activity 2014-632-FA, as well as metadata and a trackline map. 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?
   • Availability in digital form:

     Data format:	Zip file contains the swell-corrected seismic data per navigation line in format SEG-Y (version SEG-Y) Size: 13190
     Network links:	https://www.sciencebase.gov/catalog/file/get/5ee3e69182ce3bd58d7e1e4a https://doi.org/10.5066/F7SX6BCD

   • 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 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: 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)