![]() ![]() A classification system based on these parameters is shown in figure 2. The various types of landslides can be differentiated by the kinds of material involved and the mode of movement. Figure 1 shows a graphic illustration of a landslide, with the commonly accepted terminology describing its features. The materials may move by falling, toppling, sliding, spreading, or flowing. The term "landslide" describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. An idealized slump-earth flow showing commonly used nomenclature for labeling the parts of a landslide. People were evacuated and the houses nearest the slide were completely destroyed. This landslide and earthflow occurred in the spring of 1995. La Conchita, coastal area of southern California. The information in this publication provides an introductory primer on understandingīasic scientific facts about landslides-the different types of landslides, how they are initiated, and some basic informationĪbout how they can begin to be managed as a hazard. Worldwide, landslides occur and cause thousands of casualties and billions in monetary losses annually. Casualties in the United States are primarily caused by rockfalls, rock slides, and debris flows. Landslides in the United States cause approximately $3.5 billion (year 2001 dollars) in damage, and kill between 25 and 50 people annually. Alaska and Hawaii also experience all types of landslides. The primary regions of landslide occurrence and potential are the coastal and mountainous areas of California, Oregon, and Washington, the States comprising the intermountain west, and the mountainous and hilly regions of the Eastern United States. July 2004 Landslides in the United States occur in all 50 States. Landslide Types and Processes The PDF for the report is 1 MB
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