Swell-filtered, high-resolution seismic-reflection data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012

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?
   Beeson, Jeffrey W., Johnson, Samuel Y., Goldfinger, Chris, and Hartwell, Stephen R., 20160606, Swell-filtered, high-resolution seismic-reflection data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012: data release DOI:10.5066/F7GT5K8R, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/F7GT5K8R
   • https://www.sciencebase.gov/catalog/item/56e85559e4b0f59b85d712e9

   This is part of the following larger work.
   Beeson, Jeffrey W., Johnson, Samuel Y., Goldfinger, Chris, and Hartwell, Stephen R., 2016, Marine geophysical data—Cape Mendocino to Point Arena, northern California: data release DOI:10.5066/F7GT5K8R, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7GT5K8R

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -124.47752
   East_Bounding_Coordinate: -123.78899
   North_Bounding_Coordinate: 40.30684
   South_Bounding_Coordinate: 39.35035
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 17-Sep-2012

   Ending_Date: 25-Sep-2012

   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: 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?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point
   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
   Entity_and_Attribute_Detail_Citation: http://wiki.seg.org/wiki/SEG_Y
   

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Jeffrey W. Beeson
   • Samuel Y. Johnson
   • Chris Goldfinger
   • Stephen R. Hartwell
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 collected as part of USGS efforts to better understand the northernmost section of the San Andreas 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: 2013 (process 1 of 4)

   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 each 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
   

   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: 19-Oct-2020 (process 3 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

   Date: 13-Oct-2021 (process 4 of 4)

   Edited metadata to correct minor typos and bring it up to PCMSC standards. No data were changed. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Susan 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 best available version.
2. How accurate are the geographic locations?
   Unspecified
3. How accurate are the heights or depths?
   Unspecified
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

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:

None. USGS-authored or -produced data and information are in the public domain.

Use_Constraints:

The U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research. Share data products developed using these data with the U.S. Geological Survey.

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? Downloadable high-resolution seismic-reflection data
3. What legal disclaimers am I supposed to read?

   These data, identified as corrected, high-resolution seismic-reflection data, have been approved for release and publication by the U.S. Geological Survey (USGS). Although these data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at 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. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	SEG-Y Size: 6130
     Network links:	https://www.sciencebase.gov/catalog/file/get/56e85559e4b0f59b85d712e9 https://doi.org/10.5066/F7GT5K8R

   • Cost to order the data: None

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)