Reprocessed multichannel seismic-reflection (MCS) data from USGS field activity T-1-96-SC collected in San Diego Bay, California in 1996

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Drake M. Singleton
Originator: Daniel S. Brothers
Originator: Jared W. Kluesner
Originator: Ray W. Sliter
Publication_Date: 20210518
Title:

Reprocessed multichannel seismic-reflection (MCS) data from USGS field activity T-1-96-SC collected in San Diego Bay, California in 1996

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

Series_Name: data release
Issue_Identification: DOI:10.5066/P93Z2LYJ

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/P93Z2LYJ
Online_Linkage:

https://www.sciencebase.gov/catalog/item/604fcb2cd34eb1203122e248

Description:

Abstract:

This data release presents reprocessed multichannel seismic-reflection (MCS) data that was originally collected in 1996 in partnership with the California Division of Mines and Geology and Caltrans as part of a seismic hazard assessment of the Coronado Bridge in San Diego Bay, California. The original survey collected 130 km of data with a 14-cubic inch sleeve-gun (airgun) source, a 24-channel streamer, and 3.125 m shot spacing. Reprocessed profiles show increased data resolution, with data recorded to 750 ms two-way-travel-time, and interpretable data down to about 400 m.

Purpose:

Data were reprocessed as part of an effort to investigate faulting in south San Diego Bay. Data were used to characterize fault structure, changes in sub-surface stratigraphy, and investigate recency of faulting. Reprocessing scheme included applying a linear moveout, f-k filter, velocity analysis, normal moveout, water bottom mute, stacking, and time migration. These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.

Supplemental_Information:

Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=T196SC
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: 19960609
Ending_Date: 19960613

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: -117.230246
East_Bounding_Coordinate: -117.097027
North_Bounding_Coordinate: 32.728142
South_Bounding_Coordinate: 32.631426

Keywords:

Theme:

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

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Substrate
Theme_Keyword: Distributions

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sub-bottom profiling
Theme_Keyword: geospatial datasets
Theme_Keyword: marine geophysics

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: seismic reflection profiling
Theme_Keyword: seabed
Theme_Keyword: acoustic methods
Theme_Keyword: mapping
Theme_Keyword: geophysics

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:f4f9c42d-bdbb-4f24-9be9-e9b394932e08

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

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: San Diego Bay
Place_Keyword: State of California

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: San Diego Bay

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: None

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, California Division of Mines and Geology, and Caltrans as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

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

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

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/604fcb2cd34eb1203122e248?name=T-1-96-SC_SDBay_reproc_mcs_tracklines.jpg&allowOpen=true

Browse_Graphic_File_Description:

Map of tracklines along which MCS data were collected during USGS field activity T-1-96-SC

Browse_Graphic_File_Type: JPEG

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, but quality control was conducted during acquisition.

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:

The original survey lines and navigation from 1996 were stored on magnetic tape files that were destroyed in a warehouse fire. The reprocessed profiles in this dataset therefore did not include navigation data in the SEG-Y header. To overcome this, the original trackline map was georeferenced and individual profiles digitized. The total length of these profiles was divided by the 3.125 m gather spacing to produce the profile navigation. As a result of the georeferencing and uncertainty in profile locations on the original figure, the final locations of some profiles may carry a location error of ~10-100 m. Despite this uncertainty, a comparison of previously mapped features in San Diego Bay shows good agreement in the reprocessed MCS lines presented in this dataset.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

A formal accuracy assessment of the vertical positional information in the data set has not been conducted.

Lineage:

Process_Step:

Process_Description:

The original survey collected 130 km of MCS lines with a 14-cubic inch sleeve-gun (airgun) source, 24-channel streamer, and 3.125 m shot spacing. The original MCS data were stored as 12-fold common-depth-point gathers with 3.125 m bin spacing. Following transcribing of profiles to modern digital format, the originals SEG-Y files were reprocessed through the Shearwater Reveal software package. The original 24-trace shot gathers were sampled at 250 ms with a total length of 0.75 s. Linear moveout and f-k filters were applied to shot gathers to reduce linear coherent noise and energy from refracted arrivals at longer offsets, which were especially prevalent in shallow San Diego Bay and in portions of the bay proximal to large cement structures such as Naval docks. Next, shot gathers were sorted into common-mid-point (CMP) gathers using a 3.125-m bin spacing (12-fold). Velocity analysis was performed every 100 CMPs by maximizing semblance for supergathers constructed using 15 CMPs, and the resulting velocity models were used to apply normal moveout corrections (NMO). Following NMO corrections, water-bottom and stretch-mutes were applied, and the traces were stacked. Lastly, Stolt migration was applied to stacked sections using a constant velocity of 1600 m/s. Navigation is presented in UTM zone 11N in header bytes 73/77 and in 81/85.

Process_Date: 20210115

Process_Step:

Process_Description:

Corrected typo in DOI URL in onlink tag of metadata. No data were changed. (scochran@usgs.gov)

Process_Date: 20210823

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Horizontal X and Y locations for each seismic profile location are stored in the SEG-Y data trace headers in header bytes 81 and 85.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: WGS 1984 UTM Zone 11N
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -117.0
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: 0.5
Depth_Distance_Units: two-way travel time
Depth_Encoding_Method: attribute values

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview: 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_Organization_Primary:

Contact_Organization: U.S. Geological Survey - ScienceBase

Contact_Address:

Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

T-1-96-SC_SDBay_reproc_mcs.zip contains reprocessed sub-bottom (SEG-Y) data collected during USGS field activity T-1-96-SC. The data are divided up and presented by navigation line, as reflected in the individual file names.

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: SEG-Y rev 1
Format_Information_Content:

Zip files contains the processed seismic data per navigation line and are divided based on geographic location.

File_Decompression_Technique:

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

Transfer_Size: 229.91

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/604fcb2cd34eb1203122e248

Network_Resource_Name: https://doi.org/10.5066/P93Z2LYJ

Access_Instructions:

Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page with metadata and data

Fees: None.

Technical_Prerequisites:

Use of SEG-Y data requires specialized software, such as Reveal by Shearwater Geophysical; 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: 20210823
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

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

Contact_Voice_Telephone: 831-427-4747
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/ScienceBase/DR_P93Z2LYJ/T-1-96-SC_SDBay_reproc_mcs_metadata.html>