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These maps show, for emergency service managers in the San FranciscoBay region, the threshold rainfall that may be capable oftriggering a level of debris-flow activity likely to threatenpublic safety. The maps are products of a continuing series ofstudies that began after a catastrophic storm on January 3-5, 1982triggered 18,000 debris flows in the San Francisco Bay region,causing 25 deaths and $66 million in property damage. Thethreshold rainfall values were estimated by re-evaluating aprevious empirical analysis of data from the 1982 storm, and otherhistorical rainfall records, that normalized the rainfall intensitydata by dividing by the mean annual precipitation (MAP) of thecorresponding rain gage. The present...
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This digital map database, compiled from previously published andunpublished data, and new mapping by the authors, represents thegeneral distribution of bedrock and surficial deposits in the mappedarea. Together with the accompanying text file (pamf.ps, pamf.pdf,pamf.txt), it provides current information on the geologic structureand stratigraphy of the area covered. The database delineates mapunits that are identified by general age and lithology following thestratigraphic nomenclature of the U.S. Geological Survey. The scaleof the source maps limits the spatial resolution (scale) of thedatabase to 1:62,500 or smaller.
Tags: 06081 = San Mateo, 06085 = Santa Clara, 06087 = Santa Cruz, 1100 - Geology, 1101 - General, All tags...
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This map identifies the principal areas in the San Francisco Bayregion that are likely to produce debris flows, which are alsocalled "mudslides." Debris flows that occur in the bay region arefast-moving downslope flows of mud that may include rocks,vegetation, and other debris. These flows begin during intenserainfall as shallow landslides on steep slopes. The rapid movementand sudden arrival of debris flows pose a hazard to life andproperty during and immediately following the triggering rainfall.Debris flows in a given storm originate from a number of sourcesscattered throughout steep parts of the landscape, as shown infigure 1 (on map sheet; files sfbr- df.ps, al-df.ps, etc.). Duringsubsequent storms, new debris...
The distribution of landslides evident in the landscape -- most ofwhich are slumps, translational slides, and earth flows -- is ofinterest both for evaluation of hazard and risk and for use infurther study of landslides. Future movement of such landslides ismost likely to occur within and around the places where they havepreviously occurred. A map showing the generalized distribution ofthese landslides was published by Nilsen and Wright for the 9-countySan Francisco Bay region in 1979. Original sources available at thetime of that compilation were incomplete for the region. Landslidemapping that has since become available provides a basis forrevision and extension of that work, and modern procedures allowthis to...
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Debris flows, debris avalanches, mud flows and lahars arefast-moving landslides that occur in a wide variety of environmentsthroughout the world. They are particularly dangerous to life andproperty because they move quickly, destroy objects in their paths,and can strike with little warning. The purpose of this map is toshow where debris flows have occurred in the conterminous UnitedStates and where these slope movements might be expected in thefuture.
Tags: 1500 - Hazards, 1503 - Landslides, 3200 - Raster, 3220 - Grid, Alabama, All tags...
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Debris flows, debris avalanches, mud flows and lahars arefast-moving landslides that occur in a wide variety of environmentsthroughout the world. They are particularly dangerous to life andproperty because they move quickly, destroy objects in their paths,and can strike with little warning. The purpose of this map is toshow where debris flows have occurred in the conterminous UnitedStates and where these slope movements might be expected in thefuture.
Tags: 1500 - Hazards, 1503 - Landslides, 3100 - Vector, 3110 - ESRI, 3112 - export, All tags...


    map background search result map search result map Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: Raster data Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: vector data Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: vector data Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: Raster data