Crater Lake revealed.(Mapplet: cartography, analysis, and beyond)

Geospatial Solutions, December, 2004 by Ramsey, David W.; Dartnell, Peter; Bacon, Charles R.; Robinson, Joel E.; Gardner, James V.

Located in the Cascade Region of southern Oregon, Crater Lake was formed when a 12,000-foot volcano known as Mount Mazama exploded about 7,700 years ago. Molten rock expelled during the eruption caused the volcano to collapse, forming a large volcanic depression (or caldera). Subsequent smaller eruptions took place as water filled the caldera, eventually forming the deepest lake in the United States.

Understanding these past eruptive events is important in predicting the likelihood of future eruptions, any of which could threaten the facilities and people at Crater Lake National Park and the major transportation corridor east of the Cascade Range. In the summer of 2000, the U.S. Geological Survey, Pacific Seafloor Mapping Project and Volcano Hazards Team,...

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