Landslide debris aprons offshore of southern California, 2023

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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: Antoinette G. Papesh
Originator: Maureen L. Walton
Originator: James E. Conrad
Originator: Daniel S. Brothers
Originator: Jared W. Kluesner
Originator: Mary L. McGann
Publication_Date: 20230821
Title: Landslide debris aprons offshore of southern California, 2023
Geospatial_Data_Presentation_Form: polygon shapefile
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9IIWTYL

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/P9IIWTYL
Online_Linkage:

https://www.sciencebase.gov/catalog/item/5ef12a2682ced62aaae18f67

Larger_Work_Citation:

Citation_Information:

Digital maps of submarine landslides and mass wasting features offshore of southern California, 2023

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9IIWTYL

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/P9IIWTYL

Description:

Abstract:

Landslide debris aprons have been mapped offshore of Southern California. Polygons were mapped from visual interpretation of high-resolution multibeam echosounder data (MBES), single-beam echosounder data, and seismic reflection data.

Purpose:

These data were compiled as a part of a USGS effort to understand the geologic processes of mass wasting offshore of Southern California. They are intended to provide baseline knowledge of the geology, geomorphology, and distribution of landslides debris aprons offshore of Southern California, for use by scientists, managers, and the general public. These data can be used with geographic information systems (GIS) software for research purposes.

Supplemental_Information:

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1998
Ending_Date: 20210730

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.913005
East_Bounding_Coordinate: -117.313146
North_Bounding_Coordinate: 34.517488
South_Bounding_Coordinate: 32.465078

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: Distributions

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: scientific interpretation
Theme_Keyword: geospatial datasets
Theme_Keyword: earth characteristics
Theme_Keyword: sea-floor characteristics
Theme_Keyword: marine geophysics
Theme_Keyword: marine geology
Theme_Keyword: landslides
Theme_Keyword: hazards
Theme_Keyword: geologic processes
Theme_Keyword: oceanic lithosphere

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: natural agents of coastal change
Theme_Keyword: geology
Theme_Keyword: geophysics
Theme_Keyword: geological features
Theme_Keyword: hazards and disasters
Theme_Keyword: earthquake effects
Theme_Keyword: geologic mapping
Theme_Keyword: oceanographic observations

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:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5ef12a2682ced62aaae18f67

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: United States of America
Place_Keyword: State of California
Place_Keyword: Pacific Ocean

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(s) of the dataset and in products derived from these data.

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: debrisaprons_offshore_socal_2023_thumb.png
Browse_Graphic_File_Description:

Southern California location map with bathymetry and mapped debris aprons

Browse_Graphic_File_Type: PNG

Native_Data_Set_Environment:

Mac Pro, Late 2013, with macOS High Sierra, version 10.13.6 running Parallels Virtual Machine; ESRI ArcGIS 10.7.

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.

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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

These data and associated attributes have been created from several bathymetric datasets. Landslide debris apron mapping was cross-checked where more than one bathymetric dataset spanned a suspected landslide debris apron. The accuracy of debris apron mapping correlates to the highest resolution dataset that spans a particular debris apron.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Peter Dartnell
Originator: Neal W. Driscoll
Originator: Daniel S. Brothers
Originator: James E. Conrad
Originator: Jared Kluesner
Originator: Graham Kent
Originator: Brian D. Andrews
Publication_Date: 2015
Title:

Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the inner continental borderland, southern California

Geospatial_Data_Presentation_Form: Raster Digital Data Set
Series_Information:

Series_Name: Scientific Investigations Map
Issue_Identification: DOI:10.3133/sim3324

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.3133/sim3324

Type_of_Source_Media: Digital Resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1998
Ending_Date: 2014

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Dartnell and others, 2015
Source_Contribution:

High resolution multibeam bathymetry was used as a base layer to begin drawing polygons for landslide interpretation.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Peter Dartnell
Originator: Emily C. Roland
Originator: Nicole A. Raineault
Originator: Christopher M. Castillo
Originator: James E. Conrad
Originator: Renato Kane
Originator: Daniel S. Brothers
Originator: Jared W. Kluesner
Originator: Maureen A. L. Walton
Publication_Date: 2021
Title:

Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the northern part of the California Continental Borderland, southern California

Geospatial_Data_Presentation_Form: Raster Digital Data Set
Series_Information:

Series_Name: Scientific Investigations Map
Issue_Identification: DOI:10.3133/sim3473

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.3133/sim3473

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1998
Ending_Date: 2018

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Dartnell and others, 2021
Source_Contribution:

High resolution multibeam bathymetry was used as a base layer to begin drawing polygons for landslide interpretation. This is a compilation of publicly available multibeam bathymetry data published at various resolutions ranging from 2-30 meters. Data sources used are shown on Figure 1 of the report and links to the data are provided therein.

Source_Information:

Source_Citation:

Citation_Information:

Originator:

Seafloor Mapping Lab of California State University Monterey Bay

Publication_Date: 2018
Title: California Margin Geology Series
Geospatial_Data_Presentation_Form: Raster Digital Data Sets
Publication_Information:

Publication_Place: Seaside, CA
Publisher: California State University, Monterey Bay

Online_Linkage: http://seafloor.otterlabs.org/SFMLwebDATA.htm

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2000
Ending_Date: 2018

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Seafloor Mapping Lab, 2018
Source_Contribution:

High resolution multibeam bathymetry was used as a base layer to begin drawing polygons for landslide interpretation. High resolution multibeam bathymetry data at resolutions ranging from 2 – 10 meters from survey datasets H11875, H11876, H11877, H11878, H11879, H11880, H11881, H11882, H11883, H11891, H11950, H11951, H11952, H11953, and the 2014 Southern California Data Gap Project (Dana Point, San Onofre Blocks 01-03, La Jolla, Mission Beach, Point Loma North, Point Loma South, and Imperial Beach) were used.

Source_Information:

Source_Citation:

Citation_Information:

Originator: MBARI Seafloor Mapping Team
Publication_Date: 2001
Title: Santa Barbara multibeam survey
Geospatial_Data_Presentation_Form: Raster Digital Data Set
Publication_Information:

Publication_Place: online
Publisher: MBARI

Online_Linkage: https://www3.mbari.org/data/mapping/Santa_Barbara_Basin/

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1998
Ending_Date: 2001

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: MBARI Seafloor Mapping Team, 2001
Source_Contribution:

High resolution multibeam bathymetry was used as a base layer to begin drawing polygons for landslide interpretation. This is 20-meter resolution bathymetry data.

Source_Information:

Source_Citation:

Citation_Information:

Originator: NOAA
Publication_Date: 2012
Title: U.S. Coastal Relief Model - Southern California vers. 2
Geospatial_Data_Presentation_Form: Raster Digital Data Sets
Publication_Information:

Publication_Place: online
Publisher: NOAA

Online_Linkage: https://doi.org/10.7289/V5V985ZM

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19990101
Ending_Date: Present

Source_Currentness_Reference: published 2013-07-08

Source_Citation_Abbreviation: National Geophysical Data Center, 2012
Source_Contribution:

The NCEI 3-arc-second elevation grid (approximately 90-meter resolution) was used as a base layer to begin drawing polygons for landslide interpretation where no high resolution multibeam bathymetry data (listed above) were available.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Ray W. Sliter
Originator: James E. Conrad
Originator: Holly F. Ryan
Originator: Peter J. Triezenberg
Publication_Date: 2017
Title:

Minisparker seismic-reflection data of field activity S-12-10-SC: Oceanside to La Jolla, offshore southern California from 2010-06-01 to 2010-06-12

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

Series_Name: Data Release
Issue_Identification: DOI:10.5066/F7QN64W8

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/F7QN64W8
Online_Linkage:

https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-F7QN64W8/

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20100601
Ending_Date: 20100612

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Sliter and others, 2017a
Source_Contribution:

Seismic reflection profiles were used to map extent of debris apron for the Del Mar slide.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Ray W. Sliter
Originator: James E. Conrad
Originator: Holly F. Ryan
Originator: Peter J. Triezenberg
Publication_Date: 2017
Title:

Minisparker seismic-reflection data of field activity S-07-11-SC: offshore San Diego, and Los Angeles Counties, southern California from 2011-06-08 to 2011-06-22

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

Series_Name: Data Release
Issue_Identification: DOI:10.5066/F7SF2TCV

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/F7SF2TCV
Online_Linkage:

https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-F7SF2TCV/

Type_of_Source_Media: Digital resource
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20110608
Ending_Date: 20110622

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Sliter and others, 2017b
Source_Contribution:

Seismic reflection profiles were used to map extent of debris apron for the San Gabriel Slide Complex.

Process_Step:

Process_Description:

A compilation of existing bathymetry data was used as a base layer to map landslide features. Data from listed sources was downsampled in ESRI ArcMap and merged into a single 30-m grid to create the base layer. In some cases, the source swath data was higher resolution than the 30-m compilation and was used to map landslide features. A list of source swath data is detailed in the Source Used Citations. Where high (<30 m) resolution data was unavailable, the 90-m resolution NOAA Coastal Relief Model was used as the base layer. Using this base layer, landslides, headwall scarps, and areas of mass-wasting were mapped. Mapped landslide bodies were divided into evacuation zones and debris aprons based on negative (i.e., evacuation zones) or positive (i.e., debris aprons) seafloor relief associated with the landslide masses.

Source_Used_Citation_Abbreviation: Dartnell and others, 2015
Source_Used_Citation_Abbreviation: Dartnell and others, 2021
Source_Used_Citation_Abbreviation: Seafloor Mapping lab, 2018
Source_Used_Citation_Abbreviation: MBARI Seafloor Mapping Team, 2001
Source_Used_Citation_Abbreviation: NOAA National Geophysical Data Center, 2012
Source_Used_Citation_Abbreviation: Sliter and others, 2017a
Source_Used_Citation_Abbreviation: Sliter and others, 2017b
Process_Date: 20230202

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 63

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: debrisaprons_offshore_socal_2023
Entity_Type_Definition: polygons representing mapped landslide debris aprons
Entity_Type_Definition_Source: U.S. Geological Survey

Attribute:

Attribute_Label: FID
Attribute_Definition: internal feature number
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain:

automatically generated sequential unique whole number identifier

Attribute:

Attribute_Label: Shape
Attribute_Definition: feature geometry
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: feature type

Attribute:

Attribute_Label: name_id
Attribute_Definition: the name of the debris apron
Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

The names of the landslide debris aprons are identical to the names of the landslide feature in which the debris apron belongs (see landslides_offshore_socal_2023.shp, available elsewhere in this data release). We define prefixes as follows: CB is Catalina Basin; CI is Catalina Island; GSC is Gulf of Santa Catalina; PA is Point Arguello; SBB is Santa Barbara Basin; SClB is San Clemente Basin; SCB is Santa Cruz Basin; SDT is San Diego Trough; SG is San Gabriel; SNB is San Nicolas Basin; SPB is San Pedro Basin.

Attribute:

Attribute_Label: area_m2
Attribute_Definition: Area of debris apron in square meters
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 19963
Range_Domain_Maximum: 196388611
Attribute_Units_of_Measure: square meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: area_err
Attribute_Definition:

Estimated uncertainty of debris apron area from data resolution and user interpretation, values in square meters. GIS-calculated area was approximated as a circle geometry with radius uncertainty of plus or minus 50 meters and plus or minus 20 meters for areas greater and less than 100,000 square meters, respectively. These values are based on 2 pixels of the likely resolution of bathymetric data used for mapping (25-meter and 10-meter resolutions). The calculated error is the standard deviation of the maximum, minimum, and picked geometries.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 10043
Range_Domain_Maximum: 2481440
Attribute_Units_of_Measure: square meters
Attribute_Measurement_Resolution: 1

Overview_Description:

Entity_and_Attribute_Overview:

Polygon shapefile containing outlines and attributes of landslide debris aprons offshore of Southern California

Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

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:

debrisaprons_offshore_socal_2023.zip contains the shapefile and associated files, and is accompanied by a browse image and CSDGM FGDC-compliant metadata.

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: Shapefile
Format_Version_Number: ArcGIS 10.7
Format_Specification: polygon shapefile
Format_Information_Content:

Zip file contains the interpreted polygons shapefiles and the associated metadata

File_Decompression_Technique:

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

Transfer_Size: 0.04

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/5ef129c982ced62aaae18f67

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/5ef129c982ced62aaae18f67

Network_Resource_Name: https://doi.org/10.5066/P9IIWTYL

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. The third link points to the landing page for the entire data release.

Fees: None.

Technical_Prerequisites: These data can be viewed with GIS software.

Metadata_Reference_Information:

Metadata_Date: 20230821
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_P9IIWTYL/debrisaprons_offshore_socal_2023_metadata.html>