Daniel J. Kennedy
Alicia F. Balster-Gee
Ray W. Sliter
Jared W. Kluesner
20220428
Reprocessed legacy seismic-reflection data from USGS field activity B-1-72-SC collected offshore southern California
seismic-reflection data in SEG-Y format
data release
DOI:10.5066/P9EK7CG3
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9EK7CG3
Daniel J. Kennedy
Alicia F. Balster-Gee
Ray W. Sliter
Jared W. Kluesner
2022
Reprocessed legacy seismic-reflection data from USGS field activity B-1-72-SC collected offshore central and southern California
data release
DOI:10.5066/P9EK7CG3
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/P9EK7CG3
Seismic-reflection data were collected offshore southern California in 1972 aboard the USNS Bartlett (USGS Field Activity B-1-72-SC). In 2021 these legacy data were reprocessed to improve accuracy and geologic resolvability of California’s continental margin.
Data were acquired to map geologic structure of central and southern California’s continental margin. The reprocessed dataset increases positional accuracy and enhances the data quality which will be useful for future research on the geomorphic, sedimentary and tectonic record offshore California. These data are intended for science researchers, students, policy makers, and the general public.
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=B172SC
https://cmgds.marine.usgs.gov/fan_info.php?fan=B272SC
https://cmgds.marine.usgs.gov/fan_info.php?fan=B372SC
https://cmgds.marine.usgs.gov/fan_info.php?fan=B472SC
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The effort to rescue and reprocess these legacy seismic-reflection data profiles was supported by Pacific Gas and Electric (PG&E) through a USGS Cooperative Research and Development Agreement (CRADA). Stu Nishenko is thanked for providing copies of the original analog profiles and navigation.
19721109
19721201
ground condition at time data were collected
None planned
-120.6839
-117.38731
34.2616
32.40505
USGS Metadata Identifier
USGS:d02f18cf-7558-4124-ae47-7d079d5eb2fc
ISO 19115 Topic Category
oceans
geoscientificInformation
Data Categories for Marine Planning
Substrate
USGS Thesaurus
marine geophysics
sub-bottom profiling
geospatial datasets
Marine Realms Information Bank (MRIB) keywords
seismic reflection profiling
submarine landslides
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
Geographic Names Information System (GNIS)
State of California
Pacific Ocean
Santa Barbara Channel
Channel Islands
San Diego
NGA GEOnet Names Server (GNS)
Catalina Basin
Santa Cruz Basin
Catalina Canyon
Santa Barbara Channel
Hueneme Canyon
Santa Monica Canyon
San Nicolas Basin
San Diego Trough
Tanner Basin
Tanner Bank
Cortes Bank
None
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.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
B-1-72-SC_Tracklines_UTM11N.png
Map of seismic-reflection tracklines from B-1-72-SC falling within the UTM zone 11N geographic area of southern California.
PNG
SEGY Rev 1
Peter J. Triezenberg
Patrick E. Hart
Jonathan R. Childs
2016
National Archive of Marine Seismic Surveys (NAMSS): A USGS data website of marine seismic reflection data within the U.S. Exclusive Economic Zone (EEZ)
Triezenberg, P.J., Hart, P.E., and Childs, J.R., 2016, National Archive of Marine Seismic Surveys (NAMSS): A USGS data website of marine seismic reflection data within the U.S. Exclusive Economic Zone (EEZ): U.S. Geological Survey data release, https://doi.org/10.5066/F7930R7P.
https://walrus.wr.usgs.gov/namss/survey/b-1-72-sc/
H. Gary Greene
Eli A. Silver
Roland E. von Huene
1975
Seismic reflection profiles November 1972 cruise, USNS Bartlett, offshore Central and southern California
This USGS Open-File Report contains the hand-written seismic logs (field notes) from the acquisition cruise.
https://doi.org/10.3133/ofr75121
Scanned copies of the original seismic-reflection data from paper rolls were provided by PG&E for this project. As these are scanned copies, an unknown loss of resolution may have occurred. These scanned copies of the original paper records are identified as the best available version and from which modern (c. 2021-2022) reprocessing of this legacy data occurred.
Navigation fixes are only every 30 minutes to 1 hour using a LORAN navigation system.
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.
Navigation fixes are only every 30 minutes to 1 hour using a LORAN navigation system that has a horizontal accuracy within tens of miles. Reprocessed data interpolates position for each trace using the original navigation fixes.
Depths shown in seismic data files are in milliseconds (round trip travel time) and are referenced to sea level.
Original seismic-reflection data were acquired during a November 1972 cruise on the USNS Bartlett offshore of central and southern California. Profiles were collected using a sparker sound source powered between 120 and 160 kJ and recorded using an analog hydrophone streamer with navigation fixes taken at 30- to 60-minute intervals using a LORAN navigation system. Data were written to paper rolls.
19721210
Scanned copies of the original paper rolls were scanned to tiff and jpeg digital format. These images have subsequently been made available in the National Archive of Marine Seismic Surveys (NAMSS; Triezenburg and others 2016).
20110817
Tiff image line parts were cropped, straightened, transposed, and merged by navigation line using Adobe Photoshop. Using Image2segy software (https://gma.icm.csic.es/ca/image2segy), raster seismic images were transformed to geo-referenced SEG-Y profiles using the original 30– to 60-minute navigation fixes. Assuming a survey speed of 8 knots (4 meters per second), shots were interpolated every 1.5 seconds resulting in 6-meter spacing between successive shots. Record delays were written to SEG-Y headers.
20210310
The following process steps were applied using Shearwater’s Reveal seismic software (https://www.shearwatergeo.com/4/reveal-software): delay recording time shift, water column mute, bottom mute 2700 ms below the water bottom, time migration at a constant 1600m/s, 3 trace median gather filter, 0-10-150-200 Hz Bandpass filter, and a final water column mute and bottom mute.
20220310
Horizontal X and Y locations for the seismic profile locations are provided and stored in the SEG-Y data trace headers in header bytes 81 and 85 locations.
WGS 1984 UTM Zone 11N
0.9996
-117.0
0.0
500000.0
0.0
coordinate pair
0.0001
0.0001
Meter
D_WGS_1984
WGS_1984
6378137.0
298.257223563
Local surface
0.1
meters
Attribute values
Navigation and seismic shots with Time Stamp in standard SEG-Y file format
Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards
U.S. Geological Survey - CMGDS
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
B-1-72-SC_UTM11N.zip contains reprocessed seismic-reflection (SEG-Y) data originally collected in 1972. The data are divided up and presented by navigation line, as reflected in the individual file names.
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.
SEG-Y
SEG-Y rev 1
Zip file contains the reprocessed seismic-reflection data per navigation line from scans of the original paper records
Winzip, 7-zip, or Winrar are free software that will open .zip files
1012.4
https://doi.org/10.5066/P9EK7CG3
Data can be downloaded using the Network_Resource_Name link and scrolling down to the Seismic Data section.
None.
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; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others.
20220428
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998