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The familiar snow-covered peaks of the Cascade Range are part of a 1,300 km (800 mi) chain of volcanoes, which extends from northern California to southern British Columbia. The volcanoes are the result of the slow slide of dense oceanic crust as it sinks beneath North America (subduction), which releases water and melts overlying rock. This rich volcanic zone contains the well-known landmark volcanoes, such as Mount St. Helens, Three Sisters, and Crater Lake and approximately 2,900 other known volcanic features ranging from small cinder cones to calderas.
What to do:
Pay close attention to emergency plans, follow instructions for closures and evacuations — it might save your life. Officials will update hazard zones and disseminate new information as the eruption develops. Keep informed about eruption progress with USGS volcano notifications. Do your part to remain safe, and help others in need.
Oregon volcanoes
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For information about the geologic hazards program at OEM, contact:
Althea Rizzo, Geological Hazards Program Coordinator