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Seismic Landslide Hazard for the Cities of Oakland and Piedmont, California

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   Miles, S.B., and Keefer, D.K., 2001, Seismic Landslide Hazard for the Cities of Oakland and Piedmont, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2379, U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • <http://pubs.usgs.gov/mf/2001/2379/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -122.3

   East_Bounding_Coordinate: -122.1

   North_Bounding_Coordinate: 37.9

   South_Bounding_Coordinate: 37.7

3. What does it look like?

   <http://pubs.usgs.gov/mf/2001/2379/images/mf2379.gif> (GIF)

   Reduced-size image of the map sheet, 450x546 pixels, 32-bit RGB true color.

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 1969

   Ending_Date: 2000

   Currentness_Reference:

   The data used in the construction of this map were published by the USGS between 1969 and 1999. Transformation of this data was performed in 2000. The date of construction should be considered with respect to state of the practice when using this map.

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: Map

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 2049 x 2012, type Grid Cell

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 10

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 1

      Longitude_of_Central_Meridian: -123

      Latitude_of_Projection_Origin: 37.7

      False_Easting: 0

      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
      

7. How does the data set describe geographic features?

   Landslide hazard grid cell

   Any elements in hazard map data (Source: Author)

   Value

   Value refers to color within Arc/Info plot code table. 1-6 indicate increasing hazard. (Source: Author)

   Value	Definition
   7	unanalyzed
   8	water

   Range of values
   Minimum:	1
   Maximum:	6

   Count

   Arc/Info assigned count of number of cells of a given Value (Source: Authors)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Miles, S.B.
   • Keefer, D.K.

2. Who also contributed to the data set?

   The authors would like to thank Russ Graymer, Steve Walter and Scott Graham for technical assistance during the map construction. We would also like to thank Ray Wilson and Kevin Schmidt for reviews of the map and manuscript.

3. To whom should users address questions about the data?
   Scott B Miles
   U.S. Geological Survey
   Mail Stop 977
   345 Middlefield Rd
   Menlo Park, CA 94025
   USA
   

   650-329- (voice)
   650-329-5163 (FAX)
   smiles@usgs.gov
   

Why was the data set created?

The map is intended as a tool for regional planning. Any site- specific planning or analysis should be undertaken with the assistance of a qualified geotechnical engineer. This hazard map should not be used as a substitute to the State of California Seismic Hazard Zones map for the same area. (See California Department of Conservation, Division of Mines and Geology, 1999). As previously noted for maps of this type by Wieczorek and others (1985), this map should not be used as a basis to determine the absolute risk from seismically triggered landslides at any locality, as the sole justification for zoning or rezoning and parcel, for detailed design of any lifeline, for site- specific hazard-reduction planning, or for setting or modifying insurance rates.

How was the data set created?

1. From what previous works were the data drawn?

   DEM (source 1 of 2)

   U.S. Geological Survey, 2000, San Francisco Bay Area 24K Digital Elevation Model Database (10 meters): U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • <http://bard.wr.usgs.gov/getDEMSMap.html>

   Other_Citation_Details:

   Original URL: <http://bard.wr.usgs.gov/htmldir/dem_html/index.html>

   Type_of_Source_Media: Online

   Source_Scale_Denominator: 24000

   Source_Contribution: Digital elevation values

   Geology (source 2 of 2)

   Graymer, R.W., Jones, D.L., and Brabb, E.E., 1996, Preliminary geologic map emphasizing bedrock formations in Alameda County, California: A digital database: U.S. Geological Survey Open-File Report 96-252, U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • <http://geology.wr.usgs.gov/open-file/of96-252/>

   Type_of_Source_Media: online

   Source_Scale_Denominator: 50000

   Source_Contribution:

   Geologic formation boundaries and identities Fault trace

2. How were the data generated, processed, and modified?

   Date: 2000 (process 1 of 1)

   The map construction process is described in detail within accompaning narrative.
   In brief, slope was calculated from the DEM. Geologic units were assigned strength parameters. Distance to each pixel in grid was calculated from fault trace. Arias intensity was calculated using equation of (Wilson, 1993) and the calculated distances. Soil strength and slope were used to calculate static factor of safety for saturated conditions. Factor of safety and slope was used to calculate critical acceleration. Critical acceleration and Arias intensity were combined using the equation of Jibson et al. (1998)

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

   The attribute contained in this database is the result of mathematical modeling. User should refer to accompanying narrative to assess if attribute is appropriate for their use.

2. How accurate are the geographic locations?

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   This map product is entirely derived from existing digital map data sources.

5. How consistent are the relationships among the observations, including topology?

   No additional checks for topological consistency were performed on this data set.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

Users should acknowledge the authors and the U.S. Geological Survey if data used to derive products. Users should check with the western publications website prior to use to check for revisions or updates.
The map is intended as a tool for regional planning. Any site- specific planning or analysis should be undertaken with the assistance of a qualified geotechnical engineer. This hazard map should not be used as a substitute to the State of California Seismic Hazard Zones map for the same area. (See California Department of Conservation, Division of Mines and Geology, 1999). As previously noted for maps of this type by Wieczorek and others ( 1985), this map should not be used as a basis to determine the absolute risk from seismically triggered landslides at any locality, as the sole justification for zoning or rezoning any parcel, for detailed design of any lifeline, for site-specific hazard-reduction planning, or for setting or modifying insurance rates.

1. Who distributes the data set? (Distributor 1 of 1)
   Earth Science Information Center, U.S. Geological Survey
   507 National Center
   Reston, VA 20192
   USA
   

   1-888-ASK-USGS (1-888-275-8747) (voice)
   

   Hours_of_Service: 0800-1600

2. What's the catalog number I need to order this data set?

   USGS Miscellaneous Field Studies Map MF-2379

3. What legal disclaimers am I supposed to read?

   Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Grid with ancillary vector coverages depicting base map information. in format Arc/Info export (version 8.0) Size: 1.7 megabytes
     Network links:	<http://pubs.usgs.gov/mf/2001/2379/oakdb.zip>

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 02-Sep-2009

Metadata author:

U.S. Geological Survey
c/o Peg Rawson
507 National Center
Reston, VA 20192
USA

703-648-4183 (voice)
mrawson@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)