Glacier Peak | U.S. Geological Survey - USGS.gov
Glacier Peak (3214 m, 10544 ft) is a stratovolcano composed mainly of dacite, which is located about 100 km (65 mi) northeast of Seattle and 110 km (70 mi) south of the International Boundary with Canada.
Eruption History of Glacier Peak | U.S. Geological Survey - USGS.gov
2023年11月12日 · Glacier Peak has erupted at intervals of about 500 to 2,000 years during the past 6,000 years and at least twice during the past 2,000 years. Eruptions of 2,000 and 1,100 years ago generated fans of pyroclastic flow deposits near …
Glacier Peak — History and Hazards of a Cascade Volcano
Glacier Peak and Mount St. Helens are the only volcanoes in Washington State that have generated large, explosive eruptions in the past 15,000 years. Their violent behavior results from the type of molten rock (magma) they produce.
Geology and History of Glacier Peak | U.S. Geological Survey
Volcanism occurs at Glacier Peak and other volcanoes in the Cascades arc due to subduction of the Juan de Fuca plate off the western coast of North America. The age of the volcanic cone of Glacier Peak itself is poorly known. The early eruptive deposits have been eroded by subsequent glaciation and buried by younger volcanic domes.
Future Eruptions at Glacier Peak | U.S. Geological Survey - USGS.gov
2023年11月4日 · Future eruptions from Glacier Peak will very likely be preceded by earthquakes, and possibly by measurable swelling of the volcano and emission of volcanic gases. All of these signals could be detected by monitoring equipment operated by the USGS and the Pacific Northwest Seismic Network (PNSN) as long adequate sensor networks are in place ...
Hazards Summary for Glacier Peak | U.S. Geological Survey
2023年11月9日 · Glacier Peak tends to erupt explosively, and when the volcano reawakens the most serious hazards will impact population centers located relatively far away from the volcano. The mountain is within a wilderness area, and although it is isolated, areas downwind and downstream would be impacted by tephra, pyroclastic flows, and lahars.
Lahar Hazards at Glacier Peak | U.S. Geological Survey - USGS.gov
2023年11月6日 · Past eruptions have severely affected river valleys that head on Glacier Peak. Pyroclastic flows mixed with melted snow and glacial ice to form rapidly flowing slurries of rock and mud known as lahars.
Earthquake Monitoring at Glacier Peak | U.S. Geological Survey
2023年11月8日 · The ability to detect and locate very small earthquakes is critical to early recognition of reawakening volcanic systems. Despite the small network and likelihood that small earthquakes have been missed, Glacier Peak is still considered one of the most seismically quiet volcanoes in the Washington and Oregon Cascades.
Lidar Reveals Glacier Peak Volcano | Land Imaging Report Site
Preliminary work suggests that Glacier Peak may be one of the most explosive volcanoes in the Cascade Range, placing it in the highest threat category within the Volcano Hazards Program’s National Volcano Early Warning System.
Ash and Tephra Fall Hazards at Glacier Peak
2023年11月8日 · Owing to prevailing wind patterns, tephra fall during future eruptions is most likely east of Glacier Peak, but it could affect communities in all directions from the volcano depending upon wind patterns during an eruption.