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Landslide Trigger Point 1997
1997-01-01T00:00:00
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This report is a digital database package containing both plotfiles and Geographic Information Systems (GIS) databases of maps of potential debris flow sources, as well as locations of historic debris flow sources, in the San Francisco Bay Region. The data are provided for both the entire region and each county within the region, in two formats. The data are provided as ARC/INFO (Environmental Systems Research Institute, Redlands, CA) coverages and grids for use in GIS packages, and as PostScript plotfiles of formatted maps similar to traditional U.S. Geological Survey map products. There is also a pamphlet available describing the databases and plotfiles. To download databases, plotfiles, or pamphlet, please select the appropriate entry below. Note the disclaimers.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This map identifies the principal areas in the San Francisco Bay region that are likely to produce debris flows, which are also called "mudslides." Debris flows that occur in the bay region are fast-moving downslope flows of mud that may include rocks, vegetation, and other debris. These flows begin during intense rainfall as shallow landslides on steep slopes. The rapid movement and sudden arrival of debris flows pose a hazard to life and property during and immediately following the triggering rainfall. Debris flows in a given storm originate from a number of sources scattered throughout steep parts of the landscape, as shown in figure 1 (on map sheet; files sfbrdf.ps, al-df.ps, etc.). During subsequent storms, new debris flows originate from different sources. These various sources, however, are similar in topographic form because debris-flow initiation requires steep slopes and prefers concave parts of hillsides. These topographic characteristics are used to predict the likely future source areas shown on this map.</SPAN></P></DIV></DIV></DIV>
The predicted debris-flow source areas were determined by Ellen and Mark by analysis of detailed mapping (Wentworth, 1986; Ellen, Cannon, and Reneau, 1988) that was meticulously digitized by Ramsey and May. The mapped debris-flow sources triggered by the 1982 storm were digitized by Wieczorek and Mark from mapping documented in Ellen and Wieczorek (1988); the boundary of this mapping was digitized by Beukelman. The shaded-relief topographic base was created by Graham using relations provided by R.A. Haugerud.
Geologic
Landslide
Debris Flow
<DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P><SPAN><SPAN>You are free to: Share - copy and redistribute the data in any medium or format. Adapt - You may make derivative works, transform, and build upon the data for any purpose, even commercial. The licensor cannot revoke these freedoms as long as you follow the license terms.</SPAN></SPAN></P><P><SPAN><SPAN>License terms: Attribution - You must give appropriate credit (if supplied, you must provide the name of the creator and attribution parties, a copyright notice, a license notice, a disclaimer notice and a link to the material) and indicate if any changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you, your organization, or your use of the data. ShareAlike - if you modify, transform, or build on the data, you must distribute your contributions under the same license as the original.</SPAN></SPAN></P><P><SPAN><SPAN>No additional Restrictions - You may not apply legal terms or technological measures that legally restrict others form doing anything the license permits.</SPAN></SPAN></P><P><SPAN><SPAN>Notices: You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation. No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the data.</SPAN></SPAN></P><P><SPAN><SPAN>EXCEPT TO THE EXTENT REQUIRED BY APPLICABLE LAW, IN NO EVENT WILL LICENSOR BE LIABLE TO YOU ON ANY LEGAL THEORY FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES ARISING OUT OF THIS LICENSE OR THE USE OF THE DATA, EVEN IF LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.</SPAN></SPAN></P><P><SPAN><SPAN>The above is an easily understandable summary of and not a substitute for the license and disclaimer for the Attribution-ShareAlike 3.0 United States (CC BY-SA 3.0 US) the full text is available at creativecommons.org.</SPAN></SPAN></P><P><SPAN><SPAN>https://creativecommons.org/licenses/by-sa/3.0/us/legalcode</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
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