Metadata: Identification_Information: Citation: Citation_Information: Originator: C.M. Wentworth Originator: S.E. Graham Originator: R.J. Pike Originator: G.S. Beukelman Originator: D.W. Ramsey Originator: A.D. Barron Publication_Date: 1997 Title: San Francisco Bay region landslide folio part C - Summary distribution of slides and earth flows in the San Francisco Bay region, California Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 97-0745-C Other_Citation_Details: ARC/INFO vector Export format (11MB for entire region). Plotfiles in PostScript also available. Online_Linkage: http://pubs.usgs.gov/of/1997/of97-745/of97-745c.html Description: Abstract: The distribution of landslides evident in the landscape -- most of which are slumps, translational slides, and earth flows -- is of interest both for evaluation of hazard and risk and for use in further study of landslides. Future movement of such landslides is most likely to occur within and around the places where they have previously occurred. A map showing the generalized distribution of these landslides was published by Nilsen and Wright for the 9-county San Francisco Bay region in 1979. Original sources available at the time of that compilation were incomplete for the region. Landslide mapping that has since become available provides a basis for revision and extension of that work, and modern procedures allow this to be done in digital form. Purpose: These maps and databases provide a summary of the distribution of landslides evident in the landscape of the San Francisco Bay region. Original identification and map delineation of these landslides required detailed analysis of the topography by skilled geologists, a task generally accomplished through the study of aerial photographs. Such original landslide maps are now available for most of the region at scales of 1:24,000 - 1:62,500 (Pike, 1997). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.678 East_Bounding_Coordinate: -120.975 North_Bounding_Coordinate: 38.888 South_Bounding_Coordinate: 36.85 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geology Theme_Keyword: geologic maps Theme_Keyword: landslides Theme_Keyword: surficial geologic units Theme_Keyword: geologic history Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: National Geologic Map Database Catalog themes, augmented Theme_Keyword: 3400 - Graphical Theme_Keyword: 3420 - PostScript Theme_Keyword: 3200 - Raster Theme_Keyword: 1500 - Hazards Theme_Keyword: 1503 - Landslides Theme_Keyword: 3220 - Grid Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Categories Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4 Place_Keyword: f06001 = Alameda Place_Keyword: f06013 = Contra Costa Place_Keyword: f06041 = Marin Place_Keyword: f06055 = Napa Place_Keyword: f06085 = Santa Clara Place_Keyword: f06087 = Santa Cruz Place_Keyword: f06075 = San Francisco Place_Keyword: f06081 = San Mateo Place_Keyword: f06095 = Solano Place_Keyword: f06097 = Sonoma Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wentworth, Carl MJR Contact_Organization: USGS-GEO-WRG-EHZ Contact_Address: Address_Type: mailing and physical address Address: Mail Stop 977, USGS 345 Middlefield Rd City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: US Contact_Voice_Telephone: 650-329-4950 Contact_Electronic_Mail_Address: cwent@usgs.gov Native_Data_Set_Environment: ARC/INFO version 7.0.4 Data_Quality_Information: Logical_Consistency_Report: These maps and databases provide a summary of the distribution of landslides evident in the landscape of the San Francisco Bay region. Original identification and map delineation of these landslides required detailed analysis of the topography by skilled geologists, a task generally accomplished through the study of aerial photographs. Such original landslide maps are now available for most of the region at scales of 1:24,000 - 1:62,500 (Pike, 1997). The summary map presented here makes selected use of these original maps and the 9-county compilation by Nilsen, Wright, and others (1979) to provide a basis for initial evaluation of areas vulnerable to slumps, translational slides, and earth flows in the region. Completeness_Report: Complete Lineage: Process_Step: Process_Description: The three 1:125,000 map sheets of the region (Aitken, 1997) were compiled separately and then combined. County databases were clipped from the composite polygon coverage for the region. The generalized landslide zones of Nilsen and Wright (1979, category 5 of plates 1-3) were captured in digital form by scanning publication negatives. Vector perimeters of the resulting category 5 areas in the raster scans were determined automatically (GRIDPOLY) and processed to smooth the boundaries and eliminate polygons with areas less than 4000-5000 square meters (noise in the data). The revision lines in the northern part of the region were traced, scanned, hand-edited on-screen, registered with latitude/longitude intersections and intersections in the township/range network, and converted to closed polygons. The information for Santa Cruz County was prepared in the same fashion, using the original. The areas of surficial deposits were extracted from Wentworth (1997) by selecting appropriate polygons, putting them into a separate data layer, and then dissolving internal lines. The result was a vector polygon layer in which the polygons were categorized as unmapped (within outer sheet boundaries), water, surficial deposits, or bedrock. Process_Step: Process_Description: Creation of original metadata record Process_Date: 20000731 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jennifer Lenz Contact_Organization: US Geological Survey Contact_Address: Address_Type: mailing Address: 12201 Surise Valley Drive, Mail Stop 918 City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 703-648-6974 Contact_Facsimile_Telephone: 703-648-6560 Contact_Electronic_Mail_Address: pschweitzer@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -123 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: SFBR-SEF.PAT Entity_Type_Definition: Database for slides and earth flows Entity_Type_Definition_Source: OFR-97-0745-C Attribute: Attribute_Label: PTYPE Attribute_Definition: Polygon type Attribute_Definition_Source: OFR-97-0745-C Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Few Landslides Enumerated_Domain_Value_Definition: contains few, if any, large mapped landslides, but locally contains scattered small landslides and questionably identified larger landslides Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Many Landslides Enumerated_Domain_Value_Definition: consists of mapped landslides and more extensive intervening areas than in 'Mostly Landslide'; defined by excluding areas free of mapped landslides Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mostly Landslide Enumerated_Domain_Value_Definition: consists of mapped landslides, intervening areas typically narrower than 1500 feet, and narrow borders around landslides Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Surficial deposits Enumerated_Domain_Value_Definition: Area of suficial deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: very few landslides Enumerated_Domain_Value_Definition: Less landslide deposits than 'few landslide' Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: water Enumerated_Domain_Value_Definition: areas of water Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: unmapped Enumerated_Domain_Value_Definition: unmapped area Attribute: Attribute_Label: L-SCAN Attribute_Definition: numerical value for landslide deposits Attribute_Definition_Source: OFR-97-0745-C Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 8 Detailed_Description: Entity_Type: Entity_Type_Label: SFBR-SEF.PAT Entity_Type_Definition: Specific location of slides and earth flows (same attributes as polygon coverage SFBR-SEF.PAT) Entity_Type_Definition_Source: OFR-97-0745-C Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Information Services Contact_Address: Address_Type: mailing Address: Box 25286, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80255-0046 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Facsimile_Telephone: 1-303-202-4695 Contact_Electronic_Mail_Address: infoservices@usgs.gov Resource_Description: US Geological Survey Open-File Report 97-0745-C Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This database, identified as 'Summary Distribution of Slides and Earth Flows in the San Francisco Bay Region, California', has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from it use. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE File_Decompression_Technique: gzip -d Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-sef.e00.gz Fees: none Metadata_Reference_Information: Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter N Schweitzer Contact_Organization: USGS Midwest Area Contact_Position: Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/ Contact_Address: Address_Type: mailing address Address: Mail Stop 954 12201 Sunrise Valley Dr City: Reston State_or_Province: VA Postal_Code: 20192-0002 Country: USA Contact_Voice_Telephone: 703-648-6533 Contact_Facsimile_Telephone: 703-648-6252 Contact_Electronic_Mail_Address: pschweitzer@usgs.gov Metadata_Standard_Name: Content for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Date: 20160610