USGS Home
Contact USGS
Search USGS

USGS Geoscience Data Catalog

Additional USGS Geoscience data can be found by geographic location or by publication series.

San Francisco Bay region landslide folio part C - Summary distribution of slides and earth flows in the San Francisco Bay region, California

Metadata also available as - [Questions & Answers] - [Parseable text] - [DIF]

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: 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>

Keywords:

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, version 1.0
Place_Keyword: 06001 = Alameda
Place_Keyword: 06013 = Contra Costa
Place_Keyword: 06041 = Marin
Place_Keyword: 06055 = Napa
Place_Keyword: 06085 = Santa Clara
Place_Keyword: 06087 = Santa Cruz
Place_Keyword: 06075 = San Francisco
Place_Keyword: 06081 = San Mateo
Place_Keyword: 06095 = Solano
Place_Keyword: 06097 = Sonoma

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

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.

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:

Custom_Order_Process:

Export, TAR, PostScript, or Text files can be obtained by sending a tape with requestn and return address to:
San Francisco Bay Region Landslide Folio c/o Database Coordinator U.S. Geological Survey 345 Middlefield Road, MS 975 Menlo Park, CA 94025
Do NOT omit any part of this address!
The file (s) will be returned on the tape. The acceptable tape types are:
1/4 inch, 150MB cartridge tap 2.3 or 5.0 GB, 8 mm Exabyte tape.
In the request, be sure to include the Open-File Report number and the specific names of the file(s) that you want, using the names listed in the Report Contents section above. An Open-File Report number alone is not sufficient, because there are several parts to the report and they are available in different file types. If you are obtaining a plot file on tape to give to a vendor to plot, make sure that your vendor is capable of reading the tape type and file type (PostScript or PDF).

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: Gzipped ARC/INFO export format file
File_Decompression_Technique:: gzip utility is available free of charge over the Internet via links from the USGS Public Domain Software page:
<http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/public.html>

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address: