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Aldercrest-Banyon landslide
The Aldercrest-Banyon landslide was a major slow-moving landslide in the east Kelso, Washington neighborhood of Aldercrest beginning in early 1998 through 1999. The disaster ended up being one of the worst urban landslides in United States history in terms of cost. The landslide is one of the most notable in Washington state, which has many landslides due to its mountainous terrain. The Aldercrest-Banyon landslide was the first landslide disaster in the United States that the Federal Emergency Management Agency (FEMA) declared an official disaster area.
==History==
The Aldercrest residential neighborhood was completed in three phases between 1973 and 1979. It is built on an ancient landslide that may have occurred during the Missoula floods (15,300–12,700 years ago). Approximately 2 to 14 million years ago, the Columbia River deposited gravels, sands, silts, and clays and are known as the Troutdale Formation. In the area of the landslide, along a northwest-southeast trending ridge about one-half mile east of Interstate 5, the Troutdale Formation ranges from approximately thick in the Kelso area and was deposited upon a much older, near-shore marine sedimentary deposit known as the Cowlitz Formation. These areas are known for landslide activity. At the base of the slope is the Coweeman River.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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