Partnerships for Reducing Landslide Risk Assessment of the National Landslide Hazards Mitigation Strategy (2004) / Chapter Skim
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Appendix A: Case Studies--A Widespread Problem
Appendix A: Case Studies--A Widespread Problem
Pages 115-126
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Appendixes
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Extensive damage results when winter storms and heavy rainfall combine to cause the coastal bluffs to fail. Recently, a small landslide on a coastal bluff received local notice; the following report was printed in the North County Times (San Diego County, California)
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Fatalities in Oregon. On November 18, 1996, heavy rains on the Oregon Coast Range dropped more than 18 cm of rain in a 24-hour period, leading to widespread shallow landsliding and debris flow generation.
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However, several parts of New York State, including the Finger Lakes region and the Hudson and Mohawk valleys, and other limited areas in the northeastern United States, such as Boston, and in the Puget Sound region of the Pacific Northwest are covered with similar glacial clays, originally deposited in lakes or in marine environments. Such clays are characterized by unstable internal structures and ~http: / /www.oregongeology.com/Landslide/Landslidehome.htm.
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Huge Coastal Slide, Michigan. When local resident George Weeks walked his dog along the shore in Sleeping Bear Dunes National Lakeshore, Michigan, on an unusually warm February morning in 1995, he was shocked to find that where there had only recently been a beautiful beach was now a steep 100-foot drop into Lake Michigan (USGS, 1998; Figure A.2~.
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Small flows joined to form larger flows that, upon entering lowland valleys, spread mud, boulders, and other debris and inundated homes and farms (Figure Aid. One debris flow traveled nearly 2 miles, and an eyewitness estimated that it moved at a speed approaching 20 miles per hour.
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Multiple Landslide Types, Pacific Northwest. The Pacific Northwest coastal mountains are frequently subjected to episodes of numerous relatively small landslides following winter storms.
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USGS scientists conducted reconnaissance surveys to assess the landslide triggering mechanisms (Baum and Chleborad, 1999) , and reported that there were a variety of landslide types, including earth slides, rock slides, rock falls, rapid earth flows, and debris flows.
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One person was killed at the concession stand, and 14 people were seriously injured. The National Park Service and USGS geologists conducted assessments and ultimately developed maps showing hazard zones and areas of rock fall potential in Yosemite Valley (Wieczorek et al., 1998a; Wieczorek and Snyder, 1999; Wieczorek et al., 1999~.
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Landslide damage from the Northridge earthquake was only moderate because the area was neither heavily developed nor populated. However landslides did block roads, damage and destroy homes, disrupt transportation links and lifelines, and damage oil and gas production facilities.
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, 1998. Popular Beach Disappears Underwater in Huge Coastal Landslide Sleeping Bear Dunes, Michigan.
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