Metadata: 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: 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: 2023 Title: 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