| snippet:
|
This map shows the relative likelihood of deep-seated landsliding based on regional estimates of rock strength and steepness of slopes. On the most basic level, weak rocks and steep slopes are most likely to generate landslides. The map uses detailed information on the location of past landslides, the location and relative strength of rock units, and steepness of slope to estimate susceptibility to deep-seated landsliding.
This landslide susceptibility map is intended to provide infrastructure owners, emergency planners, and the public with a general overview of where landslides are more likely to occur. It is not appropriate for evaluation of landslide potential at any specific site. |
| summary:
|
This map shows the relative likelihood of deep-seated landsliding based on regional estimates of rock strength and steepness of slopes. On the most basic level, weak rocks and steep slopes are most likely to generate landslides. The map uses detailed information on the location of past landslides, the location and relative strength of rock units, and steepness of slope to estimate susceptibility to deep-seated landsliding.
This landslide susceptibility map is intended to provide infrastructure owners, emergency planners, and the public with a general overview of where landslides are more likely to occur. It is not appropriate for evaluation of landslide potential at any specific site. |
| accessInformation:
|
California Geological Survey |
| thumbnail:
|
|
| maxScale:
|
50000 |
| typeKeywords:
|
[] |
| description:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>The Susceptibility to Deep-Seated Landslides map covers the entire state of California and was originally published in May of 2011 as CGS Map Sheet 58. It made use of several data layers of varying scales and formats, such as Landslide Inventory, Geology, Rock Strength, and Slope. For the statewide analysis of landslide susceptibility, the methodology of Wilson and Keefer (1985) was used in combining the rock strength and slope data layers as implemented by Ponti, el al. (2008) to create classes of landslide susceptibility (0 to 10, low to high). These classes express the generalization that on very low slopes, landslide susceptibility is low even in weak materials, and that landslide susceptibility increases with slope and in weak rocks. Areas where existing landslides have been mapped were assigned to the highest landslide susceptibility class (i.e. 10). </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>The landslide susceptibility matrix, based on Rock Strength (RS) and Slope Steepness (SS) in degrees, is described below:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(1) & SS(<3 to 10); RS(2) & SS(<3); RS(3) & SS(<3) = susceptibility 0. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(1) & SS(10 to15) = susceptibility class 3</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(2) & SS(3 to10) = susceptibility class 5</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(1) & SS(15 to 20) – susceptibility class 6</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(1) & SS(20 to 30); RS(3) & SS(3 to 10) = susceptibility class 7</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(1) & SS(30 to >40); RS(2) & SS(10 to 15) = susceptibility class 8</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(2) & SS(15 to >40); RS(3) & SS(10 to 15) = susceptibility class 9</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>RS(3) & SS(15 to >40) = susceptibility class 10</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P></DIV></DIV></DIV> |
| licenseInfo:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-size:10pt">The State of California, the Department of Conservation, and the California Geological Survey make no representations or warranties regarding the accuracy of data or maps. Neither the State nor the Department shall be liable under any circumstances for any direct, special, incidental, or consequential damages with respect to any claim by any user or third party on account of or arising from the use of data or maps. Users should cite the California Geological Survey as the original source of the data, but clearly denote cases where the original data have been updated, modified, or in any way altered from the original condition.</SPAN></P></DIV></DIV></DIV></DIV>, <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>Distribution: There are no restrictions on distribution of the data or reproduction of maps created from the graphics files. However, users are encouraged to refer others to the California Geological Survey to acquire the data, in case updated data become available. CGS Map Sheet 58, the published form of the grid map, can be viewed at: </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>http://www.conservation.ca.gov/cgs/information/publications/ms/Documents/MS58.pdf</SPAN></P></DIV></DIV></DIV> |
| catalogPath:
|
|
| title:
|
Susceptibility to Deep-Seated Landslides in California |
| type:
|
|
| url:
|
|
| tags:
|
["deep-seated landslides","landslide susceptibility","landslide hazard","California"] |
| culture:
|
en-US |
| name:
|
|
| guid:
|
|
| minScale:
|
625000 |
| spatialReference:
|
|