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Prior to the 1980 eruption of Mount St. Helens, the only known fatality related to volcanic activity in the Cascades occurred in 1934, when a climber suffocated in oxygen-poor air while exploring ice caves melted by fumaroles in Coalman Glacier on Mount Hood.
6 lis 2023 · Learn about the eruptive history of Mount Hood, a volcano that has been active for at least 500,000 years and has produced lava flows, domes, pyroclastic flows, and lahars. See maps, photos, and descriptions of the major eruptive periods and events that shaped the volcano and its surroundings.
Mount Hood has erupted episodically for about 500,000 years and hosted two major eruptive periods during the past 1,500 years. During both recent eruptive periods, growing lava domes high on the southwest flank collapsed repeatedly to form pyroclastic flows and lahars that were distributed primarily to the south and west along the Sandy River ...
4 lis 2023 · Learn about the history and potential hazards of Mount Hood, a very episodic volcano that erupted twice in the past 1,500 years. Find out how a future eruption could affect the local population, infrastructure, and environment in the region.
Mount Hood, seen here from the north across the Columbia River Gorge, rises above low hills of older volcanic rocks. Located only 75 km ENE of Portland, Mount Hood is near communities, infrastructure, and transportation routes, posing risk from eruptive activity and debris flows.
In the past 2,000 years, Mount Hood has experienced three eruptive periods: the Timberline period, just over 1,500 years ago; the Zigzag period, about 600 years ago; and the Old Maid period, between the 1760s and the early 1800s.
The most recent eruptive period of Mount Hood volcano, the Old Maid eruptive period, was characterized by volcano-hydrologic events (hydrologic events initiated by volcanic activity) which resulted in extensive lahar inundation in the White, Sandy, and Zigzag River drainages and produced a lithic pyroclastic flow which traveled at least 9 km ...
