In Oregon, deposits from pyroclastic flows are a frequent part of the geologic record east of the Cascades. Before the 1980 Mount St. Helens episode, the incidence and impact of lateral eruptions was poorly understood. During this event, the northeastward blast knocked down trees and increased the damage significantly.
Mount Hood’s last major eruption occurred in the 1790’s not long before Lewis and Clark’s expedition to the Pacific Northwest. In the mid-1800’s, local residents reported minor explosive activity, but since that time the volcano has been quiet.
A volcano is an opening in Earth’s crust where magma breaks through, raining down molten rock, ash and gases. There are several types of volcanoes.
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DOGAMI Volcanic Hazards. Information about Oregon’s volcanic hazards from the Oregon Department of Geology and Mineral Industries (DOGAMI).
Stromboli Geology and Hazards. The island of Stromboli was built by a series of eruptions of potassium-rich basalt and basaltic andesite lavas. The first eruptions began about 200,000 years ago, and formed the now-eroded Strombolicchio volcano.
Detailed Description. A page from the National Atlas that leads to additional multimedia pages about potentially active volcanoes in Oregon. Details
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Mount hood establishments. william keith (American, 1838-1911). Mount Hood, Oregon, ca. 1881-1883. Name. Mt. Hood as seen from Timothy Lake. The Multnomah name for Mount Hood was wy’east. volcanic activity. The glacially eroded summit area consists of several andesitic. Elevation. Mount Hood.
On Dec. 22 at 9:03 p.m. local time, a 64-hectare (158-acre) chunk of Anak Krakatau volcano, in Indonesia, slid into the ocean following an eruption. This landslide created a tsunami that struck.
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Volcanic activity is causing the earth to rise in Oregon, scientists have found. Though whether such uplift is a sign of an imminent eruption remains uncertain.
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It is probably the only volcano in Oregon which has erupted in historic times (last confirmed activity in 1865-66). Andesite-dacite lava domes form the glacially eroded summit complex. The main hazard from Mt Hood are posed by pyroclastic flows and mud flows (lahars) in case of an eruption.
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