![]() The inhabitants of the town of Thistle, directly upstream from the landslide, were evacuated as the lake began to flood the town, and within a day the town was completely covered with water. The impounded river water inundated the small town of Thistle. It also flowed across the Spanish Fork River, forming a dam. The landslide destroyed the railroad tracks of the Denver and Rio Grande Western Railway Company, and the adjacent Highway 89. The landslide occurred during the spring of 1983, when unseasonably warm weather caused rapid snowmelt to saturate the slope. The Thistle, Utah, landslide cost in excess of $200 million dollars to fix. What was the most expensive landslide to fix in the United States? The Association of American State Geologists provides links to the State Geologist for every state. Every state in the US has a geoscience agency and most have some landslide information. The NLIC is designed to serve landslide researchers, geotechnical practitioners engaged in landslide stabilization, and anyone else concerned in any way with landslide education, hazard, safety, and mitigation. Geological Survey Landslide Hazards Program that collects and distributes all forms of information related to landslides. The USGS National Landslide Information Center (NLIC) is a part of the U.S. Where can I find landslide information for my area? ![]() They are commonly a result of building roads and structures without adequate grading of slopes, of poorly planned alteration of drainage patterns, and of disturbing old landslides. Many human-caused landslides can be avoided or mitigated. Yes, in some cases human activities can be a contributing factor in causing landslides. ![]() Although the physical causes of many landslides cannot be removed, geologic investigations, good engineering practices, and effective enforcement of land-use management regulations can reduce landslide hazards. Globally, landslides cause billions of dollars in damages and thousands of deaths and injuries each year.Īs people move into new areas of hilly or mountainous terrain, it is important to understand the nature of their potential exposure to landslide hazards, and how cities, towns, and counties can plan for land-use, engineering of new construction and infrastructure, and other measures which will reduce the costs of living with landslides. It is estimated that in the United States they cause in excess of $1 billion in damages and from about 25 to 50 deaths each year. Landslides are a serious geologic hazard. Burned areas charred by wildfires are particularly susceptible to debris flows, given certain soil characteristics and slope conditions. These flows are initiated by heavy periods of rainfall, but sometimes can happen as a result of short bursts of concentrated rainfall or other factors in susceptible areas. Debris flows can travel down a hillside at speeds up to 200 miles per hour (more commonly, 30 – 50 miles per hour), depending on the slope angle, water content, volume of debris, and type of earth and debris in the flow. ![]() Landslides can move slowly, (millimeters per year) or can move quickly and disastrously, as is the case with debris flows. 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. Landslides in the United States occur in all 50 States. Submarine landslides sometimes cause tsunamis that damage coastal areas. These landslides are called submarine landslides. Landslides can be triggered by rainfall, snowmelt, changes in water level, stream erosion, changes in ground water, earthquakes, volcanic activity, disturbance by human activities, or any combination of these factors.Įarthquake shaking and other factors can also induce landslides underwater. Slope movement occurs when forces acting down-slope (mainly due to gravity) exceed the strength of the earth materials that compose the slope. A landslide is defined as the movement of a mass of rock, debris, or earth down a slope due to gravity. The materials may move by falling, toppling, sliding, spreading, or flowing.Īlmost every landslide has multiple causes. ![]()
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