Are there earthquakes associated with Mount Hood?
Felt earthquakes on Mount Hood (Oregon) occur every 2 years on the average. Seismic monitoring, in effect since 1977, indicates a generalized concentration of earthquakes just south of the summit area and 2-7 kilometers below sea level. A seismic swarm in July 1980, during which nearly 60 earthquakes (mostly 5-6 kilometers deep with a maximum bodywave magnitude of 2.8) recorded in a 5-day period, prompted development of an emergency response plan to coordinate local authorities in the event of future eruption. -- From: Swanson, et.al., 1989, IGC Field Trip T106: Cenozoic Volcanism in the Cascade Range and Columbia Plateau, Southern Washington and Northernmost Oregon: American Geophysical Union Field Trip Guidebook T106.
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Geologic map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon
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Volcanoes!
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A perspective view of Mount hood
A perspective view of Mount hood, made from the OR_Sandy_River_2007 lidar data
Mount Hood
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Mount Hood, OR
View of Mount Hood from Pittock Mansion, Portland, OR.
Trillium Lake with Mount Hood in the background
Trillium Lake with Mount Hood in the background