High-resolution Chirp seismic-reflection data from USGS cruise 2018-641-FA, collected in south-central California in support of the Bureau of Ocean Energy Management (BOEM)-funded California Deepwater Investigations and Groundtruthing (Cal DIG I) offshore alternative energy project from 2018-08-29 to 2018-09-20

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Identification_Information:

Citation:

Citation_Information:

Originator: Daniel J. Kennedy
Originator: Maureen A.L. Walton
Originator: Guy R. Cochrane
Originator: Alicia F. Balster-Gee
Originator: Jared W. Kluesner
Originator: Patrick E. Hart
Originator: Ray W. Sliter
Originator: Jennifer K. Miller
Originator: Lisa Gilbane
Publication_Date: 20210711
Title:

High-resolution Chirp seismic-reflection data from USGS cruise 2018-641-FA, collected in south-central California in support of the Bureau of Ocean Energy Management (BOEM)-funded California Deepwater Investigations and Groundtruthing (Cal DIG I) offshore alternative energy project from 2018-08-29 to 2018-09-20

Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9JU17GE

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9JU17GE
Larger_Work_Citation:

Citation_Information:

High-resolution multi-channel and Chirp seismic-reflection data from USGS cruise 2018-641-FA, collected in south-central California in support of the Bureau of Ocean Energy Management (BOEM)-funded California Deepwater Investigations and Groundtruthing (Cal DIG I) offshore alternative energy project from 2018-08-29 to 2018-09-20

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9JU17GE

Publication_Information:

Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9JU17GE

Description:

Abstract:

High-resolution Chirp seismic-reflection data were collected offshore south-central California as part of a geophysical survey aboard the NOAA Ship Rainier during two legs at sea, the first from 8/28/2018 to 9/7/2018 and the second from 9/10/2018 to 9/21/2018. The data were collected using an Edgetech 512i towfish with a 1-6 kHz sweep. Consistently high winds and rough seas prevented additional Chirp data collection and caused noisy data in some cases, especially during the second leg of the survey, which largely took place in the southern part of the study area. The Chirp data were post-processed to include filtering and other noise removal corrections.

Purpose:

These data were collected as part of the California Deepwater Investigations and Groundtruthing (Cal DIG I) project, which focuses on the offshore south-central region of California at water depths of 500 to 1,200 meters, in Federal waters outside of the State of California three nautical mile limit. The goal of study is to conduct a reconnaissance survey of the outer continental shelf of south-central California for the purpose of improving regional models of seafloor (benthic) habitats, geologic hazards, and sedimentary processes. Geophysical and geological data from this project are needed to address important issues associated with marine spatial planning, ecosystem assessments, geohazards, and offshore infrastructure.

Supplemental_Information:

Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-641-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20180829
Ending_Date: 20180920

Currentness_Reference: Ground condition at time data were collected

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.98
East_Bounding_Coordinate: -120.94
North_Bounding_Coordinate: 35.83
South_Bounding_Coordinate: 34.53

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:1681acb2-b6c4-4426-a157-d254cc4aa481

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Oceans
Theme_Keyword: Elevation
Theme_Keyword: geoscientificinformation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation
Theme_Keyword: Distributions
Theme_Keyword: Assessments

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sub-bottom profiling

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: seismic reflection profiling

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: Edgetech 512i Chirp

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean
Place_Keyword: State of California
Place_Keyword: Diablo Canyon
Place_Keyword: Morro Bay

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Santa Lucia Bank
Place_Keyword: Santa Barbara Basin

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.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:

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

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: Cal_DIG_I_Chirp_tracklines.png
Browse_Graphic_File_Description:

Thumbnail image of bathymetric terrain model of the Cal DIG I project area with chirp lines shown in red, south-central California.

Browse_Graphic_File_Type: PNG

Data_Set_Credit:

Data were collected aboard NOAA’s (National Oceanic and Atmospheric Administration) Rainier research vessel, funded by the Buereau of Ocean Energy Management (BOEM) in order to adequately address potential impacts in environmental impact statements and environmental assessments under the National Environmental Policy Act (NEPA).

Native_Data_Set_Environment: SEG-Y Rev 1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Identified as best available version.

Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:

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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Position data were provided by a Differential Global Positioning System (DGPS) navigation receiver with a stated accuracy of +/- 10 centimeter.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Vertical accuracy ranges between +/- 0.2 and 1 meter.

Lineage:

Process_Step:

Process_Description:

Chirp Subbottom data were collected during USGS cruise 2018-641-FA using an Edgetech 5 12i Chirp towfish deployed from the NOAA ship Rainier’s main A-frame and operated at a 1-6 kHz sweep. The data were collected along sub-perpendicular dip lines across previously surveyed areas in water depths up to ~1,200 m, generating imagery as much as 30-50 m into the subsurface. Upon collection, the Chirp data were first converted from native .jsf format to .segy envelope format and were then transferred to a file server to be processed with Echos paradigm software. The water column was cropped to enable processing at a shorter record length, and a water-bottom mute was also applied to remove sparker cross-talk noise in the water column. Towfish depth and swell corrections were applied, and the data were median-filtered and trace-balanced where necessary to correct for amplitude variations introduced by sparker cross-talk and the Edgetech software auto-gain during acquisition. Where marine wildlife shutdowns occurred, missing traces were filled by blank traces. Lastly, data were spliced together and renamed to match their corresponding Multi-channel seismic (MCS) lines collected during the same survey.

Process_Date: 20191008

Process_Step:

Process_Description:

Performed minor edits to the metadata to correct typos. No data were changed

Process_Date: 20211013
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Susan A. Cochran

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov

Spatial_Data_Organization_Information:

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 header bytes 181 and 185 locations.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: WGS 1984 UTM Zone 10N
Transverse_Mercator:

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_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D WGS 1984
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

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

Entity_and_Attribute_Information:

Overview_Description:

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

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:

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

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Resource_Description:

This part of the data release contains processed, high-resolution Chirp seismic-reflection (SEG-Y) data collected during PCMSC field activity 2018-641-FA. The data are divided up and presented by navigation line, as reflected in the individual file name(s). File sizes range from 4.1 MB to 805.8 MB.

Distribution_Liability:

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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SEG-Y
Format_Version_Number: SEGY rev 1
Format_Information_Content:

Processed, high-resolution Chirp seismic-reflection data per navigation line. File sizes range from 4.1 MB to 805.8 MB.

File_Decompression_Technique:

Winzip, 7-zip, or Winrar are free software that will open .zip files

Transfer_Size: 805.8

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P9JU17GE

Access_Instructions:

Data can be downloaded using the Network_Resource_Name link, then scroll down to the Seismic Data/Chirp Seismic SEGY files section.

Fees: None.

Technical_Prerequisites:

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.

Metadata_Reference_Information:

Metadata_Date: 20211013
Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:

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

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9JU17GE/CalDIG_2018-641-FA_CHIRP_Metadata.html>