High-Resolution Chirp and Mini-Sparker Seismic-Reflection Data From the Southern California Continental Shelf—Gaviota to Mugu Canyon

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Metadata

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Ray W. Sliter, Peter J. Triezenberg, Patrick E. Hart, Amy E. Draut, William R. Normark, and James E. Conrad

Publication_Date: 2008

Title:

High-Resolution Chirp and Mini-Sparker Seismic-Reflection Data From the Southern California Continental Shelf--Gaviota to Mugu Canyon

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2008-1246

Publication_Information:

Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/of/2008/1246/>

Geospatial_Data_Presentation_Form: seismic reflection profile section

Description:

Abstract:

This report consists of high-resolution chirp and single-channel Sparker seismic-reflection- profile data from the Santa Barbara Channel, California. These data were acquired in 2007 using the Research Vessel Zephyr2 (USGS Cruise ID: Z-3-07-SC) and the Research Vessel Parke Snavely (USGS Cruise ID: S-7-08-SC). The data are available in binary, TIFF and JPEG image formats. Binary data are in Society of Exploration Geologists (SEG) SEG-Y format and may be downloaded for further processing or display. Reference maps and JPEG images of the profiles may be viewed with your Web browser.

Purpose:

Marine seismic reflection data are used to image and map sedimentary and structural features of the seafloor and subsurface. These data were acquired across the northern shelf area of the Santa Barbara Channel, Calif., as part of a multiagency effort to characterize the geologic framework and sedimentary environment of the region. The specific objective of this seismic survey is to provide seismic reflection images of the depositional geometry of the upper 50 m of subbottom stratigraphy in order to better understand the mechanisms of sediment transport and deposition. These seismic profiles provide high-quality images with approximately 20 cm of vertical resolution and up to 80 m of subbottom penetration.

Supplemental_Information:

Chirp seismic-reflection profiles are acquired by means of an acoustic source and a hydrophone array, both contained in a single unit towed in the water behind a survey vessel approximately 4 meters below the water surface. The sound source emits a short (30 ms) swept-frequency (500 to 7,200 Hz) acoustic pulse, which propagates through the water and sediment columns. The acoustic energy is reflected at density boundaries (such as the sea floor or sediment layers beneath the sea floor), and detected by the hydrophone array, and digitally recorded by the onboard PC-based acquisition system. As the vessel moves, this process is repeated multiple times per second, producing a two-dimensional image of the shallow geologic structure beneath the ship track. Mini-sparker profiles are collected with a 500 Joule sparker source and 15-m single-channel streamer towed at the sea surface and using the same acquisition system.

Additional information about the USGS survey Z-3-07-SC is available at <http://walrus.wr.usgs.gov/infobank/z/z307sc/html/z-3-07-sc.meta.html>.

Additional information about the USGS survey S-7-08-SC is available at <http://walrus.wr.usgs.gov/infobank/s/s708sc/html/s-7-08-sc.meta.html>.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070912
Ending_Date: 20080701

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.2113
East_Bounding_Coordinate: -119.0521
North_Bounding_Coordinate: 34.4701
South_Bounding_Coordinate: 34.0161

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: USGS CMG InfoBank
Theme_Keyword: Marine Geology
Theme_Keyword: Marine Geophysics
Theme_Keyword: Marine Seismic

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Santa Barbara Channel
Place_Keyword: Mugu Canyon
Place_Keyword: Hueneme Canyon

Place:

Place_Keyword_Thesaurus: USGS CMG InfoBank
Place_Keyword: CA
Place_Keyword: Channel Islands National Marine Sanctuary, CA
Place_Keyword: Mugu Submarine Canyon
Place_Keyword: Hueneme Submarine Canyon
Place_Keyword: North Pacific Ocean
Place_Keyword: Northern Pacific Ocean
Place_Keyword: Southern California
Place_Keyword: California State Waters
Place_Keyword: USA

Access_Constraints:

Physical materials are under controlled on-site access.

If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Physical materials are under controlled on-site access.

Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Ray W. Sliter

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5194

Contact_Facsimile_Telephone: (650) 329-5190

Contact_Electronic_Mail_Address: rsliter@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: <https://pubs.usgs.gov/of/2008/1246/data/jpg/HC-01.jpg>
Browse_Graphic_File_Description:: Example of single-channel chirp seismic data accessible via this report.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: <https://pubs.usgs.gov/of/2008/1246/data/tif/HC-01.tif>
Browse_Graphic_File_Description:: Example of single-channel chirp seismic data accessible via this report.
Browse_Graphic_File_Type: TIFF

Native_Data_Set_Environment: SEG-Y

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)

Publication_Date: 2008

Title: USGS CMG Z-3-07-SC Metadata

Other_Citation_Details: Updated daily

Online_Linkage:

<http://walrus.wr.usgs.gov/infobank/z/z307sc/html/z-3-07-sc.meta.html>

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)

Publication_Date: 2008

Title: USGS CMG Z-7-08-SC Metadata

Other_Citation_Details: Updated daily

Online_Linkage:

<http://walrus.wr.usgs.gov/infobank/s/s708sc/html/s-7-08-sc.meta.html>

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Data have not been independently verified.

Logical_Consistency_Report: Undetermined

Completeness_Report:

Reference the full report for a description of data coverage. All seismic-reflection data collected on the referenced cruises have been included in this report. Some seismic profiles have gaps in them due to system crashes, mammal shutdowns or hardware maintenance.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:: Shot point numbers in the data files correspond to those in the navigation files. The horizontal positional accuracy of the seismic data thus linked to ship's position is estimated to be within 30 meters.

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.

Lineage:

Process_Step:

Process_Description:: Refer to report sections "Data Acquisition and Processing" for details of geophysical data acquisition and processing sequence used for data in this report. Ray W. Sliter
Process_Date: 2008

Process_Step:

Process_Description:: Created bathymetry overlay using GMT <http://gmt.soest.hawaii.edu/> Peter J. Triezenberg
Process_Date: 2008

Process_Step:

Process_Description:: Created interactive trackline map using Google Maps API <http://code.google.com/apis/maps/> Peter J. Triezenberg
Process_Date: 2008

Process_Step:

Process_Description:: Created downloadable Google Earth "kmz" file <http://code.google.com/apis/kml/> Peter J. Triezenberg
Process_Date: 2008

Process_Step:

Process_Description:: Created seismic profile images using Seismic Unix <http://www.cwp.mines.edu/cwpcodes/> to provide format options for downloading data. Ray W. Sliter
Process_Date: 2008

Process_Step:

Process_Description:

Converted profiles to TIFF and JPEG files using ImageMagick <http://www.imagemagick.org/> Peter J. Triezenberg

Process_Date: 2008

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Ray W. Sliter

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5194

Contact_Facsimile_Telephone: (650) 329-5190

Contact_Electronic_Mail_Address: rsliter@usgs.gov

Process_Step:

Process_Description:

Used GEODAS (GEOphysical DAta System) to create a custom bathymetric and topographic grid for the southern California region covered by the cruise maps. The website is: <http://www.ngdc.noaa.gov/mgg/geodas/geodas.html>. The parameters used are as follows: Grid Database: US Coastal Relief Model Grids Grid Area in degrees and minutes: 34:30 N to 33:48 N, 119:00 W to 120:24 W Grid Cell Size: 3 seconds Grid Format: XYZ (lon, lat, depth), no header, space-delimited, omit empty grid cells. Cell Parameters: 4-byte floating point, tenths of meters Land/Sea Coverage: Sea cells only. Peter J. Triezenberg

Process_Date: 2008

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Peter J. Triezenberg

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5207

Contact_Facsimile_Telephone: (650) 329-5190

Contact_Electronic_Mail_Address: ptriezenberg@usgs.gov

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Horizontal X and Y locations for the seimic profiles location are provided in ASCII position files and are also stored in the SEG-Y data trace headers in the standard header locations.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -119.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 3
Ordinate_Resolution: 3

Planar_Distance_Units: seconds

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System 1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Ray W. Sliter

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5194

Contact_Facsimile_Telephone: (650) 329-5190

Contact_Electronic_Mail_Address: rsliter@usgs.gov

Contact_Instructions:

Data may be available off-line only by special arrangement with the distributor above. Please use the on-line download option unless precluded by download times or access difficulties.

Resource_Description:

U.S. Geological Suvey Open-File Report 2008-1246

Distribution_Liability:

Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Physical materials are under controlled on-site access.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SEG-Y, JPEG, TIFF, ASCII
Transfer_Size: 2.5 gigabytes

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://pubs.usgs.gov/of/2008/1246/>

Offline_Option:

Recording_Format: ISO 9660
Offline_Media: none

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; or VISTA by Seismic Image Software.

Metadata_Reference_Information:

Metadata_Date: 20080724

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Ray W. Sliter

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5194

Contact_Facsimile_Telephone: (650) 329-5190

Contact_Electronic_Mail_Address: rsliter@usgs.gov

Metadata_Standard_Name:

FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: universal time

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none

For more information contact: Ray Sliter