Landslides 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: Landslides 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/5ef129ec82ced62aaae18f59

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:

Landslides 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 discrete landslides offshore of Southern California, for use by scientists, managers, and the general public. These data can be used with (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: -117.311194
North_Bounding_Coordinate: 34.518320
South_Bounding_Coordinate: 32.425737

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:5ef129ec82ced62aaae18f59

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: landslides_offshore_socal_2023_thumb.png
Browse_Graphic_File_Description:

Southern California location map with bathymetry and mapped discrete landslides

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. See the sedage_ref and fl_age_ref attributes within the shapefile, and the accompanying ReferencesCited_offshore_socal_2023.pdf in the Attached Files section (https://www.sciencebase.gov/catalog/item/5d9bc778e4b0366162923190), for details on where to find accuracy information regarding the data reported in the sed_age and fail_ageBP attributes.

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 mapping was cross-checked where more than one bathymetric dataset spanned a suspected landslide. The accuracy of landslide mapping correlates to the highest resolution dataset that spans a particular landslide.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

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

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. This source is a compilation of new and publicly available multibeam bathymetry data gridded at 25-meter resolution. Links to the data sources used are in the Data Catalog of the report.

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: 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

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: North American Vertical Datum of 1988
Depth_Resolution: 1.0
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: landslides_offshore_socal_2023
Entity_Type_Definition: polygons representing mapped landslides
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 landslide
Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

The name of the landslide as commonly reported in peer-reviewed publications or a unique shortform abbreviated name based on landslide location. Attribute values match those in the name_id attribute for landslide_evac_zones_2023.shp and landslide_debris_aprons_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: location
Attribute_Definition: the geographic location of the landslide
Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain: The commonly reported geographic location of the landslide

Attribute:

Attribute_Label: lat_dd
Attribute_Definition: centroid coordinate latitude
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 32.48469
Range_Domain_Maximum: 34.50649
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: long_dd
Attribute_Definition: centroid coordinate longitude
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -120.808261
Range_Domain_Maximum: -117.374616
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: area_m2
Attribute_Definition:

Area of the landslide including both evacuation zone and debris apron. Values are reported in square meters; uncertainly values may be found in the area_err attribute.

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 25646
Range_Domain_Maximum: 232290744
Attribute_Units_of_Measure: square meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: area_err
Attribute_Definition:

Estimated uncertainty 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: 11377
Range_Domain_Maximum: 2699725
Attribute_Units_of_Measure: square meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: total_len_m
Attribute_Definition:

The maximum runout length from headwall scarp to the end of landslide debris approximated by hand using a GIS ruler tool; values reported in meters

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 204
Range_Domain_Maximum: 32616
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: scarp_ht_m
Attribute_Definition:

a hand measurement of the landslide headwall scarp height in meters; see the scp_ht_err attribute for uncertainty

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 200
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: scp_ht_err
Attribute_Definition:

estimated uncertainty of the landslide headwall scarp height measurement, see scarp_ht_m, in meters

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 40
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: vol_wdg_m3
Attribute_Definition:

the volume of displaced sediment calculated using the corresponding evacuation zone area (evaczones_offshore_socal_2023.shp, found elsewhere in this data release) and approximating a wedge geometry using the measured headwall height (see scarp_ht_m attribute). The formula used is 1/2 times evacuation zone area times scarp height, in cubic meters. See vol_pcterr for uncertainty.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 23847
Range_Domain_Maximum: 8854292904
Attribute_Units_of_Measure: cubic meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: vol_pcterr
Attribute_Definition:

Estimated volume percent uncertainty from evacuation zone area (area_err attribute found in evaczone_offshore_socal_2023.shp and headwall height (see scarp_ht_m attribute) used for the volume calculation (see vol_wdg_m3_attribute). Area uncertainty (also found in the evaczone_offshore_socal_2023.shp shapefile) was calculated by propagating error in evacuation zone uncertainty (area_err) and headwall scarp height uncertainty (scp_ht_err attribute) to determine total percent volume uncertainty.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 14
Range_Domain_Maximum: 108
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: slope_deg
Attribute_Definition:

Mean slope approximation of the landslide failure plane in degrees. Determined from the mean of slope picks taken by 3 different analysts from underlying 30-m resolution (or the 90-m resolution NCEI Coastal Relief Model (National Geophysical Data Center, 2012, if 30-m resolution data was unavailable) bathymetric slope data; outliers were removed for mean calculations; values reported in degrees

Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 36.8
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: slope_err
Attribute_Definition:

calculated slope uncertainty, reported as the standard deviation of slope grid picks from the slope_deg attribute; values reported in degrees

Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 4.4
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: grad_pct
Attribute_Definition:

gradient percentage calculated from the slope_deg attribute value using tan (slope_deg)*100; values reported as percentage

Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 75
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: dep_min_m
Attribute_Definition:

the minimum depth below sea level of the landslide determined from the GIS calculated value of the minimum depth of the landslide from the NCEI coastal relief model (National Geophysical Data Center, 2012); values reported in meters

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 9
Range_Domain_Maximum: 1409
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: dep_max_m
Attribute_Definition:

the maximum depth below sea level of the landslide determined from the GIS calculated value of the maximum depth of the landslide from the NCEI coastal relief model (National Geophysical Data Center, 2012); values reported in meters

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 49
Range_Domain_Maximum: 2619
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: prox_coast
Attribute_Definition:

the landslide proximity to the coastline determined from the GIS calculated value of the minimum distance in meters between the landslide evacuation zone and the coastline from the NCEI coastal relief model (National Geophysical Data Center, 2012)

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 44165
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: prox_130m
Attribute_Definition:

the landslide proximity to the 130 meter depth contour determined from the GIS calculated value of the minimum distance in meters between the landslide evacuation zone and the 130 meter depth contour derived from the NCEI coastal relief model (National Geophysical Data Center, 2012)

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 29002
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: prox_qflts
Attribute_Definition:

the landslide proximity to quaternary faults calculated from the GIS calculated value of the distance in meters between the landslide evacuation zone and faults in the Quaternary Faults Offshore of California compilation by Walton and others, 2020

Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 48340
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: data_type
Attribute_Definition:

a list of primary data types used for landslide mapping, categorized as bathymetry (with resolution in parentheses), seismic reflection

Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

data type may be appended with its resolution information in parentheses

Attribute:

Attribute_Label: slide_type
Attribute_Definition:

following USGS landslide type identification according to USGS fact sheet 2004-3072 (USGS, 2004), categorized as: debris avalanche, earth flow, rotational, translational

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: debris avalanche
Enumerated_Domain_Value_Definition:

source areas often associated with steep gullies and usually indicated by the presence of a debris field containing blocky material, often indicating rapid debris flow.

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: earth flow
Enumerated_Domain_Value_Definition:

a slide consisting of unconsolidated surficial material, typically with a characteristic hourglass geometry

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: rotational
Enumerated_Domain_Value_Definition:

a slide in which the surface of rupture is curved concavely upward, and the slide movement is roughly rotational about an axis that is parallel to the ground surface and transverse across the slide

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: translational
Enumerated_Domain_Value_Definition:

a slide in which mass moves along a roughly planar surface with little rotation or backward tilting

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey

Attribute:

Attribute_Label: slope_type
Attribute_Definition: a classification of the slope in which the failure occurred
Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: open slope
Enumerated_Domain_Value_Definition:

an area of the continental slope not defined by the boundaries of a submarine canyon and/or channel system

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey and California Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: canyon/channel
Enumerated_Domain_Value_Definition:

an area defined by the boundaries of a submarine canyon and/or channel system

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey and California Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: shelf
Enumerated_Domain_Value_Definition:

the area nearest to the coastline characterized by shallow depths and gentle slopes

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey and California Geological Survey

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: shelf edge
Enumerated_Domain_Value_Definition:

the area at the seaward extent of the continental shelf where slopes increase and transition to the continental slope; also referred to as a shelf break

Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey and California Geological Survey

Attribute:

Attribute_Label: sed_age
Attribute_Definition:

geologic age of sediment for the majority of the failure area, from literature. See the sedage_ref attribute and the accompanying ReferencesCited_offshore_socal_2023.pdf file in the Attached Files section (https://www.sciencebase.gov/catalog/item/5d9bc778e4b0366162923190) for a comprehensive list of sources used

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Late Cretaceous
Enumerated_Domain_Value_Definition: an age of 65.5-99.6 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Eocene
Enumerated_Domain_Value_Definition: an age of 55.8-33.9 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Miocene
Enumerated_Domain_Value_Definition: an age of 23.03-5.33 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Late Miocene
Enumerated_Domain_Value_Definition: an age of 11.63-5.33 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Early Pliocene
Enumerated_Domain_Value_Definition: an age of 5.33-3.60 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Pliocene
Enumerated_Domain_Value_Definition: an age of 5.33-2.59 Ma
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Quaternary
Enumerated_Domain_Value_Definition: an age of 2.58 Ma-Present
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Pleistocene
Enumerated_Domain_Value_Definition: an age of 2.58 Ma-11.7 ka
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: late Pleistocene
Enumerated_Domain_Value_Definition: an age of 129.0-11.7 ka
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Holocene
Enumerated_Domain_Value_Definition: an age of 11.7 ka-Present
Enumerated_Domain_Value_Definition_Source: USGS, 2010; Cohen and others, 2023

Attribute:

Attribute_Label: sedage_ref
Attribute_Definition: citation information for the sed_age attribute
Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

Source citations used to characterize the age of the failed sediment in the sed_age attribute. See the accompanying ReferencesCited_offshore_socal_2023.pdf file in the Attached Files section (https://www.sciencebase.gov/catalog/item/5d9bc778e4b0366162923190) for a comprehensive list of sources used.

Attribute:

Attribute_Label: fail_ageBP
Attribute_Definition:

minimum age of failure in years before present, from literature. Where no fail age data are available, value is 0. See the fl_age_ref attribute and the accompanying ReferencesCited_offshore_socal_2023.pdf file in the Attached Files section (https://www.sciencebase.gov/catalog/item/5d9bc778e4b0366162923190 for a comprehensive list of sources used.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 200000
Attribute_Units_of_Measure: years
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: fl_age_ref
Attribute_Definition:

citation information for fault strand geometry and attributes. n/a indicates no failure age or reference available.

Attribute_Definition_Source: U.S. Geological Survey and California Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

Source citations used to characterize the failure age in years before present. See the accompanying ReferencesCited_offshore_socal_2023.pdf file in the Attached Files section (https://www.sciencebase.gov/catalog/item/5d9bc778e4b0366162923190) for a comprehensive list of sources used.

Overview_Description:

Entity_and_Attribute_Overview:

Polygon shapefile containing outlines and attributes of landslides 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:

landslides_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 shapefile, associated files, a browse image, and the metadata

File_Decompression_Technique:

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

Transfer_Size: 1.8

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/5ef129ec82ced62aaae18f59

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/5ef129ec82ced62aaae18f59

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/landslides_offshore_socal_2023_metadata.html>