California Department of Conservation, Division of Mines and Geology
2003
liquefaction
02.1
vector digital data
Official Maps of Seismic Hazard Zones
Sacramento, CA
California Department of Conservation, Division of Mines and Geology
Issued as required by the Seismic Hazards Mapping Act (Public Resources Code Section 2690-2699.6).
http://www.consrv.ca.gov/dmg/shezp/maps.htm
liquefaction
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.
The map is used by cities and counties to regulate development and by property owners selling property within areas where seismic hazard zones have been identified. Local governments can withhold development permits until geologic or soils investigations are conducted for specific sites and mitigation measures are incorporated into development plans. Sellers of property use the maps to check the location of their specific site and, if applicable, disclose to the buyer that the property lies within a seismic hazard zone.
This file was created by merging the Point Mugu, Camarillo, Santa Paula, Santa Paula Peak, Moorpark, Newbury Park, Triunfo Pass, Simi Valley West, Simi Valley East, Thousand Oaks, Calabasas, Pitas Point, Ojai, Fillmore, Piru, Val Verde, Saticoy, Point Dume, Ventura, Matilija, and Whitaker Peak quads.
en
2003
publication date
As needed
-119.478179
-118.643510
34.505740
34.040129
1554635.550294
1805058.599231
199820.247745
366631.066736
None
earthquake hazards
hazard identification and mitigation
landslides
liquefaction
seismic hazard zone
None
City of Camarillo
City of Oxnard
County of Ventura
City of Moorpark
City of Simi Valley
City of Santa Paula
City of Thousand Oaks
City of Ventura
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.
The information contained hereon was obtained from California Department of Conservation, Division of Mines and Geology by the Ventura County Resource Management Agency Information Systems Mapping and Graphics Service Department, solely for the convenience of the County and related contract entities. The County does not warrant the accuracy of this information, and no decision involving a risk of economic loss or physical injury should be made in reliance thereon.
Ventura County Resource Management Agency Information Systems
GIS Supervisor
mailing and physical address
Ventura County
Resource Management Agency
800 S. Victoria Ave., L #1700
Ventura
CA
93009
US
(805) 654-3624
(805) 654-2630
RMA.GIS@ventura.org
8 a.m. - 4 p.m.
ESRI ArcCatalog 9.3.1.3500
Shapefile
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.
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.
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 (1:24,000).
10
State of CA Dept. of Conservation, Div. of Mines & Geology / Resource Management Agency, Graphics and Mapping Service
Unified Mapping System / Liquifaction
The Unified Mapping System is a set of maps, drawn on U.S.G.S. 7 minute quads, including geologic/hazard information such as earthquake faults and soil types, political divisions such as School Districts and Sanitation Districts, and ecological information such as vegetation and wetland habitats. These maps were maintained and updated for use by the Planning Division, and have now been digitized as GIS layers.
24,000
shapefile
Boundaries of seismic hazards zones
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 moor_hz.dgn
Total
number of cells ( 2) - 25
Total number of shapes ( 6) - 660
Total number of complex shape headers (14) - 62
747 graphic elements
Metadata imported.
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Dataset copied.
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Dataset copied.
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Dataset copied.
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Dataset copied.
withheld
Dataset copied.
withheld
Metadata imported.
withheld
Dataset copied.
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Dataset copied.
withheld
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withheld
Dataset copied.
withheld
Dataset copied.
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Dataset moved.
withheld
20100518
16412300
Metadata imported.
withheld
20100630
17534900
Metadata imported.
withheld
20100701
10233100
Metadata imported.
withheld
20101203
09011300
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coordinate pair
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survey feet
North American Datum of 1927
Clarke 1866
6378206.400000
294.978698
GCS_North_American_1927
NAD_1927_California_V
liquefaction
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ESRI
Coordinates defining the features.
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Ventura County Resource Management Agency Information Systems
GIS Supervisor
(805) 654-3624
(805) 654-2630
RMA.GIS@ventura.org
8 am - 4 pm
Downloadable Data
0.885
0.885
20101203
Ventura County Resource Management Agency Information Systems
GIS Supervisor
GIS Supervisor
mailing and physical address
Ventura County Planning Division
800 S. Victoria Ave., L #1740
Ventura
CA
93009
805/654-3624
805/654-2630
RMA.GIS@ventura.org
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
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liquefaction
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GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_California_V_FIPS_0405_Feet
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liquefaction
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The map is used by cities and counties to regulate development and by property owners selling property within areas where seismic hazard zones have been identified. Local governments can withhold development permits until geologic or soils investigations are conducted for specific sites and mitigation measures are incorporated into development plans. Sellers of property use the maps to check the location of their specific site and, if applicable, disclose to the buyer that the property lies within a seismic hazard zone.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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.</SPAN></P></DIV></DIV></DIV>
earthquake hazards
hazard identification and mitigation
landslides
liquefaction
seismic hazard zone
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The information contained hereon was obtained from California Department of Conservation, Division of Mines and Geology by the Ventura County Resource Management Agency Information Systems Mapping and Graphics Service Department, solely for the convenience of the County and related contract entities. The County does not warrant the accuracy of this information, and no decision involving a risk of economic loss or physical injury should be made in reliance thereon.</SPAN></P></DIV></DIV></DIV>
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GIS Supervisor
Ventura County Resource Management Agency Information Systems
GIS Supervisor
800 S. Victoria Ave., Bldg L
Ventura
CA
93009
RMA.GIS@ventura.org
US
(805) 654-3624
8 a.m. to 4:30 p.m.
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GIS Supervisor
Ventura County Resource Management Agency Information Systems
GIS Supervisor
800 S. Victoria Ave., Bldg L
Ventura
CA
93009
RMA.GIS@ventura.org
US
(805) 654-3624
8 a.m. to 4:30 p.m.