Dataset Identification:
- This is a digital Seismic Hazard Zone Map presenting areas where liquefaction and landslides may occur during a strong earthquake. Three types of geological hazards, referred to as seismic hazard zones, may be featured on the map: 1) liquefaction, 2) earthquake-induced landslides, and 3) overlapping liquefaction and earthquake-induced landslides. Developers of properties falling within any of the three zones may be required to investigate the potential hazard and mitigate its threat during the local permitting process. Other sections: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000277 Longitude_Resolution: 0.000277 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Polygons depict areas that have been mapped as a liquefaction zone under California's Seismic Hazards Mapping Act. Entity_and_Attribute_Detail_Citation: California Code of Regulations, Title 14. Article 10,Seismic Hazards Mapping.Section 3722, Requirements for Mapping Seismic Hazard Zones.
- Title San Francisco Seismic Hazard Zones NAD83
- publication Date 2001-01-01T12:00:00
- Name Official Maps of Seismic Hazard Zones
- Issue Public Resources Code Section 2690-2699.6
Theme keywords (theme):
earthquake hazards
hazard identification and mitigation
landslides
liquefaction
seismic hazard zone
- Title None
Theme keywords (theme):
geoscientificInformation
- Title http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode
Location keywords:
City of San Francisco
San Francisco County
- Title None
Theme keywords (theme):
- Title Process > Geologic Processes
- publication Date 2018-06-27
Theme keywords (theme):
- Title Virtual International Authority File (VIAF) Corporate Names
- publication Date 2018-06-27
Theme keywords (theme):
- Title Science Domain > Earth Science
- publication Date 2018-06-27
Theme keywords (theme):
- Title Feature > Physiographic Feature
- publication Date 2018-06-27
purpose:
Browse image (thumbnail):
- maintenance or update frequency:
- Legal Constraints
-
- Access Constraints otherRestrictions
- use constraint: otherRestrictions
- Other constraints
- Access constraints: Because digital data are easily altered, cities, counties, and others who use this file in their permit review and approval processes, or for other actions mandated by law (e.g., real estate disclosure at time of transfer) are advised to obtain the file directly from the Department of Conservation.. Use Limitation: Data is provided without any express or implied warranties. Users must determine suitability. Copyright c 1999 by the California Department of Conservation, California Geological Survey. All rights reserved.. Distribution Liability: DISCLAIMER - The State of California and the Department of Conservation make no representations or warrantees regarding the accuracy of the data from which these maps were derived. Neither the State nor the Department shall be liable under any circumstances for any direct, indirect, special, incidental or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map.
Resource extent
-
- westBoundLongitude -122.5167
- eastBoundLongitude -121
- northBoundLatitude 37.8333
- southBoundLatitude 37.7083
Geographic Bounding Box - Temporal Extent
Geographic Extent
time Position
2001-01-01
- Information normally described in the Spatial Data Organization section is described here instead. The reason for this is because that section allows for description of topologically related vector elements only. Microstation is in a CADD format and does not contain topologically related objects. What is provided here are the results of a command that counts the number of elements in the design file by type on levels 3, 4, and 5. The total number of graphic elements reported is actually a count of the total number of Seismic Hazard Zone polygons in the design file. Design file P:shzm_prodsdgnbay1sf_hz.dgn
- Production of the map was funded by the California Seismic Hazard Identification Fund (SHIF).
- individual Name Diane Vaughan
- organisation Name California Geological Survey, Seismic Hazard Mapping Program
- position Name GIS Manager
- Contact information
-
- Telephone
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- Voice (916) 322-0073
- Fax (916) 445-3334
- Address
-
- 801 K Street, MS12-31, Sacramento, CA, 95814-3532
- electronic Mail Address dvaughan@consrv.ca.gov
Content information: feature catalog description
- Included With Dataset false
Data quality information
Scope of quality information
- Lineage statement
- missing
- Processing Step
-
- date and time 2001-01-01T12:00:00
- description None
- name Of Measure Horizontal Positional Accuracy
- measure Description U.S. Geological Survey base map standards provide that 90 percent of cultural features be located within 40 feet (horizontal accuracy) at the scale of this map. The identification and location of liquefaction and earthquake-induced landslide hazard zones are based on available data. However, the quality of data used is varied. The information depicted has been drawn as accurately as possible at this map scale.
- evaluation Method Description None
- Quantitative Result
-
- result value 10
- value Units
-
- evaluation Method Description This map may not show all areas that have the potential for liquefaction, landsliding, strong earthquake ground shaking or other earthquake and geologic hazards. Also, a single earthquake capable of causing liquefaction or triggering landslide failure will not uniformly affect the entire area zoned. This map does not show Alquist-Priolo earthquake fault zones, if any, that may exist in this area.Landslide hazard zones on this map were determined, in part, by adapting methods developed by the U.S. Geological Survey (USGS). A new generation of landslide maps being prepared by the USGS (Jibson and Harp, in preparation) uses an experimental approach designed to explore new methods to assess earthquake-induced landslide hazards. Although aspects of this new methodology may be incorporated in future seismic hazard zone maps, the experimental USGS should not be used as substitutes for these official earthquake-induced landslide zone maps.
- measure Description In regards to the seismic hazard zones delineated in this map, one may assume that the spatial data is logically consistent due to an automated process that fails if this is not true. This process takes design file elements such as line segments and line strings that form a seismic hazard zone boundary and turns them into shapes. Extensive areas with large perimeters are made into complex shapes in which each is comprised of a sequence of line strings that end where they start. For the process to work successfully, lines must intersect where a crossing occurs, duplicate lines may not exist, and there must not be any gaps in the intended zone. This "Complexer" process is run from Intergraph Corp's MGE Map Finisher product.
- name Of Measure Quantitative Attribute Accuracy Assessment
- measure Description Areas where previous occurrence of landslide movement, or local topographic, geological, geotechnical and subsurface water conditions indicate a potential for permanent ground displacements such that mitigation as defined in Public Resources Code Section 2693(c) would be required.
- evaluation Method Description California Code of Regulations, Title 14. Article 10,Seismic Hazards Mapping.Section 3722, Requirements for Mapping Seismic Hazard Zones.
- Quantitative Result
-
- result value earthquake-induced landslides
- value Units
-
Resource distribution information
Distributor
- individual Name Barbara Wanish
- organisation Name California Geological Survey, Seismic Hazards Mapping Program
- position Name Research Analyst
- Contact information
-
- Telephone
-
- Voice (916) 322-1178
- Fax (916) 445-3334
- Address
-
- 801 K Street, MS12-31, Sacramento, California, 95814-3531
- electronic Mail Address bwanish@consrv.ca.gov
- Linkage for online resource
-
- name San Francisco Seismic Hazard Zones NAD83
- URL: http://gmw.consrv.ca.gov/shmp
- Description URL from idinfo/citation in CSDGM metadata
- maintenance or update frequency:
- notes: This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard, version FGDC-STD-001-1998 using the August 2011-REH version of the FGDC CSDGM to ISO 19115-2 transform modified and updatated by SMR 2018-05-26 to work with xslt v1.0; generates USGIN compatible ISO19139 XML. Most recent metadata content review date: indeterminate:
- individual Name Barbara Wanish
- organisation Name California Geological Survey, Seismic Hazard Mapping Program
- position Name Research Analyst
- Contact information
-
- Telephone
-
- Voice (916) 322-5958
- Fax (916) 445-3334
- Address
-
- 801 K Street, MS12-31, Sacramento, CA, 95814-3531
- electronic Mail Address bwanish@consrv.ca.gov