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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 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...
A table keyed to 171 topographic quadrangles on a new1:275,000-scale shaded-relief map speeds access to information onlandslide locations in the ten-county San Francisco Bay region.Detailed maps showing individual landslides in nearly any area ofinterest can be found quickly by knowing only the name of theappropriate 7.5' quadrangle. The some-80 technical reports thatcontain these maps may be consulted in the U.S. Geological Survey'sMenlo Park library collection.
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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The 17 January 1994 Northridge, California, earthquake (M=6.7)triggered more than 11,000 landslides over an area of about 10,000km2. Most of the landslides were concentrated in a 1,000-km2 areathat includes the Santa Susana Mountains and the mountains north ofthe Santa Clara River valley. We mapped landslides triggered by theearthquake in the field and from 1:60,000-scale aerial photographyprovided by the U.S. Air Force and taken the morning of theearthquake; these were subsequently digitized and plotted in aGIS-based format, as shown on the accompanying maps (which also areaccessible via Internet). Most of the triggered landslides wereshallow (1-5 m), highly disrupted falls and slides in weaklycemented Tertiary...
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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...
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All or part of 25 7.5-minute quadrangles identifying 8465 Landslideslargely slow-moving slides and earth flows in Alameda County,California, have been converted to a digital-map database, compiledat 1:24,000 scale and plotted at 1:62,500 scale, that can beacquired from the U.S. Geological Survey over the Internet or onmagnetic tape.


    map background search result map search result map Digital Compilation of Landslide Overview Map of the Conterminous United States 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 Inventory of landslides triggered by the 1994 Northridge, California earthquake Digital Compilation of Landslide Overview Map of the Conterminous United States Geologic map of central (interior) Alaska: Digital data Landslides in Alameda County, California, A Digital Database Extracted from Preliminary Photointerpretation Maps of Surficial Deposits by T.H. Nilsen in USGS Open-File Report 75-277 Inventory of landslides triggered by the 1994 Northridge, California earthquake Geologic map of central (interior) Alaska: Digital data Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: vector data Digital Compilation of Landslide Overview Map of the Conterminous United States Digital Compilation of Landslide Overview Map of the Conterminous United States Map showing inventory and regional susceptibility forHolocene debris flows and related fast moving landslides inthe conterminous United States: Raster data