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.
Quicklinks and Information
Check out these resources
Get prepared to be 2 Weeks Ready!
For information about the geologic hazards program at OEM, contact:
Althea Rizzo, Geological Hazards Program Coordinator
Karen Parmelee, Geological Hazards Awareness Coordinator