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Book Chapter

Shallow landslide hazard map of Seattle, Washington

By
Edwin L. Harp
Edwin L. Harp
U.S. Geological Survey, Box 25046, Mail Stop 966, Denver Federal Center, Denver, Colorado 80225, USA
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John A. Michael
John A. Michael
U.S. Geological Survey, Box 25046, Mail Stop 966, Denver Federal Center, Denver, Colorado 80225, USA
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William T. Laprade
William T. Laprade
Shannon & Wilson, Inc., 400 N. 34th St., #100, Seattle, Washington 98103, USA
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Published:
January 2008

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 designated Seattle as a “Project Impact” city with the goal of encouraging the city to become more disaster resistant to landslides and other natural hazards. A major recommendation of the Project Impact council was that the city and the U.S. Geological Survey collaborate to produce a landslide hazard map. An exceptional data set archived by the city containing more than 100 yr 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 debris flows, which are 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 the analysis consisted of a digital slope map derived from recent light detection and ranging (LiDAR) imagery of Seattle, recent digital geologic mapping of the city, and shear-strength test data for the geologic units found in the surrounding area. The combination of these data layers within a geographic information system (GIS) platform allowed us to create a shallow landslide hazard map for Seattle.

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Contents

GSA Reviews in Engineering Geology

Landslides and Engineering Geology of the Seattle, Washington, Area

Edited by
Rex L. Baum
Rex L. Baum
U.S. Geological Survey Box 25046, Mail Stop 966 Denver, Colorado 80225 USA
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Jonathan W. Godt
Jonathan W. Godt
U.S. Geological Survey Box 25046, Mail Stop 966 Denver, Colorado 80225 USA
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Lynn M. Highland
Lynn M. Highland
U.S. Geological Survey Box 25046, Mail Stop 966 Denver, Colorado 80225 USA
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Geological Society of America
Volume
20
ISBN electronic:
9780813758206
Publication date:
2008

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