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Landslides are a widespread, frequent, and costly hazard in Seattle and the Puget Sound area of Washington State, USA. Shallow earth slides triggered by heavy rainfall are the most common type of landslide in the area; many transform into debris flows and cause significant property damage or disrupt transportation. Large rotational and translational slides, though less common, also cause serious property damage. The hundreds of landslides that occurred during the winters of 1995-96 and 1996-97 stimulated renewed interest by Puget Sound communities in identifying landslide-prone areas and taking actions to reduce future landslide losses. Informal partnerships between the U.S. Geological Survey (USGS), the City of...
Categories: Publication; Types: Citation; Tags: Landslides
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This cover contains the outlines of recent landslides formed prior to Hurricane Mitch in October - November 1998. Jeffrey Coe and Robert Bucknam mapped the landslides. Most landslides were mapped using 1:40,000-scale aerial photographs and a Kern PG-2 photogrammetric plotter at 4X and 8X magnifications. The photographs were scaled and oriented to the topographic base map using prominent topographic landmarks and plotted on a transparent polyester overlay registered to the topographic base maps at scales of 1:50,000 or 1:25,000. In areas where landslides were very sparse, the aerial photographs were scanned with a mirror stereoscope at 4X magnification, and landslide locations were transferred to base maps by inspection....
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This cover contains the outlines of recent landslides formed prior to Hurricane Mitch in October - November 1998. Jeffrey Coe and Robert Bucknam mapped the landslides. Most landslides were mapped using 1:40,000-scale aerial photographs and a Kern PG-2 photogrammetric plotter at 4X and 8X magnifications. The photographs were scaled and oriented to the topographic base map using prominent topographic landmarks and plotted on a transparent polyester overlay registered to the topographic base maps at scales of 1:50,000 or 1:25,000. In areas where landslides were very sparse, the aerial photographs were scanned with a mirror stereoscope at 4X magnification, and landslide locations were transferred to base maps by inspection....
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This cover contains the outlines of recent landslides formed prior to Hurricane Mitch in October - November 1998. Jeffrey Coe and Robert Bucknam mapped the landslides. Most landslides were mapped using 1:40,000-scale aerial photographs and a Kern PG-2 photogrammetric plotter at 4X and 8X magnifications. The photographs were scaled and oriented to the topographic base map using prominent topographic landmarks and plotted on a transparent polyester overlay registered to the topographic base maps at scales of 1:50,000 or 1:25,000. In areas where landslides were very sparse, the aerial photographs were scanned with a mirror stereoscope at 4X magnification, and landslide locations were transferred to base maps by inspection....
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Rockfalls strongly influence the evolution of steep rocky landscapes and represent a significant hazard in mountainous areas. Defining the most probable future rockfall source areas is of primary importance for both geomorphological investigations and hazard assessment. Thus, a need exists to understand which areas of a steep cliff are more likely to be affected by a rockfall. An important analytical gap exists between regional rockfall susceptibility studies and block-specific geomechanical calculations. Here we present methods for quantifying rockfall susceptibility at the cliff scale, which is suitable for sub-regional hazard assessment (hundreds to thousands of square meters). Our methods use three-dimensional...
Categories: Publication; Types: Citation; Tags: Landslides
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This cover contains initiation location of landslides formed during Hurricane Mitch in October - November 1998. Locations were identified by manually selecting the upslope location of the landslides in the cover ls23622.
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This cover contains initiation location of landslides formed during Hurricane Mitch in October - November 1998. Locations were identified by manually selecting the upslope location of the landslides in the cover ls23622.
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This map describes the possible hazard from earthquake-induced landslides for the city of Berkeley, CA. The hazard depicted by this map was modeled for a scenario corresponding to an M=7.1 earthquake on the Hayward, CA fault. This scenario magnitude is associated with complete rupture of the northern and southern segments of the Hayward fault, an event that has an estimated return period of about 500 years. The modeled hazard also corresponds to completely saturated ground-water conditions resulting from an extreme storm event or series of storm events. This combination of earthquake and ground-water scenarios represents a particularly severe state of hazard for earthquake- induced landslides. For dry ground-water...
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The April 1998 El Niño-Triggered Anzar Road landslide, San Benito County, California El Niño-driven rainfall triggered many landslides and debris flows in northern and north-central California during the winter and spring of 1997-98. The 1997-98 rainy season began normally in the fall of 1997, but turned unusually wet in late November. The 1998 Anzar Road landslide occurred as a reactivation of an old landslide in Pleistocene nonmarine claystone, sandstone and conglomerate immediately adjacent to the San Andreas rift Zone. Destructive movement began during the early morning of april 22 as a moderately deep-seated earth slide within the area of the old landslide. This slide, on an average slope of 12 degrees,...
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California earthquake. Landslides 2 1/2 miles northwest of Bolinas Lagoon, looking east-northeast. Earthquake cracks made in April, 1906, caught water from rains the following winter. The saturated earth flowed as liquid mud. Marin County, California. March 29, 1907. (Panorama with photo no. 3049)
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San Francisco, California, Earthquake April 18, 1906. Flow failure down a hillside slope on the Nunez Ranch 4 miles (6.4 km) east of Half Moon Bay. Note the man standing at the base of the deposited debris and a second man standing on the lower edge of the cavity at the top of the slide. Additional incipient flow failures with much smaller movements also occurred on the convex hill to the left of the principal landslide. Photograph previously published in Lawson and others (1908, pl. 133B) with caption "Earth-flow 4 miles east of Half Moon Bay." San Mateo County, California. 1906. Published as figure 22 in U. S. Geological Survey. Professional paper 993. 1978. Photograph by R. A. Anderson, J. C. Branner collection,...
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Blackfeet Indian Reservation. "Quartzite gravel," possibly pre- Wisconsin glacial drift, west end of top of Landslide Butte, NW1/4, Sec. 3, T. 36 N., R. 8 W. Part indicated by hammer has a clay matrix and resembles glacial till. No striated pebbles found. Blackfoot quadrangle. Glacier County, Montana. September 5, 1912.
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Municipal crews attempt to clear streets and drainage systems of water, mud and debris between record-breaking rains in late July/early August 2006. El Paso County was declared a Federal Disaster Area following rain and thunderstorms which caused mud slides. (Photograph by Robert J. Alvey/FEMA)


map background search result map search result map Seismic Landslide Hazard for the City of Berkeley, California Older landslides in La Uni�n quadrangle, Guatemala Landslide initiation locations in Mariscos quadrangle, Guatemala Landslide initiation locations in Morales quadrangle, Guatemala Older landslides in R�o Hondo quadrangle, Guatemala Older landslides in Tactic quadrangle, Guatemala Anzar road landslide, San Benito County, California. 1998. El Paso Landslide. El Paso County, Texas. 2006. Seismic Landslide Hazard for the City of Berkeley, California Landslide initiation locations in Mariscos quadrangle, Guatemala Older landslides in La Uni�n quadrangle, Guatemala Older landslides in R�o Hondo quadrangle, Guatemala Older landslides in Tactic quadrangle, Guatemala Landslide initiation locations in Morales quadrangle, Guatemala Anzar road landslide, San Benito County, California. 1998. El Paso Landslide. El Paso County, Texas. 2006.