{ "name":"USGSPublic/Landslide_Trigger_Point_1997", "title":"USGSPublic/Landslide_Trigger_Point_1997", "type":"Map Service", "typeKeywords":["ArcGIS Server","Service","Map Service"], "description":"

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>", "extent":[[-1.3696092094876217E7,-1.3595920225257924E7],[4600666.575586665,4677738.16215476]], "url":"https://socogis.sonomacounty.ca.gov/map/rest/services/USGSPublic/Landslide_Trigger_Point_1997/MapServer" }