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Landslides and Landslide Hazards in Washington State Due to February 5-9, 1996 Storm
"During the week of February 4, 1996, cumulative rainfall levels of up to 23 in. fell in areas of Oregon, Washington, and Idaho. Combined records of rainfall and water equivalent of snowmelt were as high as 39 in. for this period in the Gifford Pinchot National Forest of southern Washington (National Resources Conservation Service, water and Climate Center, Portland, Oregon). Areas of highest rainfall intensities were centered on the Oregon-Washington border. Estimates of damage from the floods and landslides exceed $300 million (FEMA Interagency Hazard Mitigation Team, 1996) in Washington and Oregon alone. [...] The following text describes in greater detail the areas of high, moderate, and low landslide concentrations, noteworthy individual landslide sites, factors affecting landslide concentrations, and estimations of the landslide hazards that potentially still exist."
Geological Survey (U.S.)
Harp, Edwin L.; Cannon, Susan H.; Wilson, Raymond C. . . .
1996?
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Shallow-Landslide Hazard Map of Seattle, Washington
From the report's abstract: ""Landslides, particularly debris flows, have long been a significant cause of damage and destruction to people and property in the Puget Sound region. Following the years of 1996 and 1997, the Federal Emergency Management Agency (FEMA) designated Seattle as a 'Project Impact' city with the goal of encouraging the city to become more disaster resistant to the effects of landslides and other natural hazards. A major recommendation of the Project Impact council was that the city and the U.S. Geological Survey (USGS) collaborate to produce a landslide hazard map of the city. An exceptional data set archived by the city, containing more than 100 years of landslide data from severe storm events, allowed comparison of actual landslide locations with those predicted by slope-stability modeling. We used an infinite-slope analysis, which models slope segments as rigid friction blocks, to estimate the susceptibility of slopes to shallow landslides which often mobilize into debris flows, water-laden slurries that can form from shallow failures of soil and weathered bedrock, and can travel at high velocities down steep slopes. Data used for analysis consisted of a digital slope map derived from recent Light Detection and Ranging (LIDAR) imagery of Seattle, recent digital geologic mapping, and shear-strength test data for the geologic units in the surrounding area. The combination of these data layers within a Geographic Information System (GIS) platform allowed the preparation of a shallow landslide hazard map for the entire city of Seattle."
Geological Survey (U.S.)
Harp, Edwin L.; Michael, J. A.; Laprade, William T. (William Thomas), 1945-
2006
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Hazard Analysis of Landslides Triggered by Typhoon Chata'an on July 2, 2002, in Chuuk State, Federated States of Micronesia
From the Abstract: "More than 250 landslides were triggered across the eastern volcanic islands of Chuuk State in the Federated States of Micronesia by torrential rainfall from tropical storm Chata'an on July 2, 2002. [...] This report first presents an overview of the landslide event, the types and distribution of landsliding triggered by Chata'an, and individual descriptions of some of the significant landslides. The report then discusses continuing hazards from landslides for the islands affected by Chata'an. To address landslide hazard, the report presents a landslide (debris-flow) hazard map and discusses possible uses of this map."
Geological Survey (U.S.); United States. Department of the Interior
Harp, Edwin L.; Reid, Mark E.; Michael, J. A.
2004
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