![]() Fundamental topics such as the development, history, and stability of the volcano are poorly understood. Most of the geologic work on Mount Rainier was done more than two decades ago. Despite the potential for such danger, Mount Rainier has received little study. A major volcanic eruption or debris flow could kill thousands of residents and cripple the economy of the Pacific Northwest. More than 100,000 people live on the extensive mudflow deposits that have filled the rivers and valleys draining the volcano during the past 10,000 years. It last erupted approximately 150 years ago, and numerous large floods and debris flows have been generated on its slopes during this century. The rivers draining the volcano empty into Puget Sound, which has two major shipping ports, and into the Columbia River, a major shipping lane and home to approximately a million people in southwestern Washington and northwestern Oregon. ![]() This metropolitan area is the high technology industrial center of the Pacific Northwest and one of the commercial aircraft manufacturing centers of the United States. The volcano is located about 35 kilometers southeast of the Seattle-Tacoma metropolitan area, which has a population of more than 2.5 million. Mount Rainier is one of about two dozen active or recently active volcanoes in the Cascade Range, an arc of volcanoes in the northwestern United States and Canada.
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