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Mt Hood Volcano | John Seach
Oregon, USA
45.37 N, 121.69 W,
summit elevation 3426 m
stratovolcano
Mt Hood is Oregon's highest peak. It is located 75 km ESE of Portland. It is the only volcano in Oregon which has erupted historically. The summit area is composed of andesite and dacite domes. Solfatara activity has weakened the rocks and made them susceptible to slope failure.
The volcano poses a direct hazard to communities downstream due to the risk of pyroclastic flows and lahars during times of eruption.
2002 Earthquakes
A magnitude 4.5 earthquake occurred at Mt Hood volcano on 29th June 2002. Between 29th June and 15th August 2002, there were 200 aftershocks measured. The earthquakes occurred along two faults, and appear to be tectonic in origin, rather than volcanic.
Further Reading
Scott, W.E., Pierson, T.C., Schilling, S.P., Costa, J.E., Gardner, C.A., Vallance, J.W. and Major, J.J., 1997. Volcano hazards in the Mount Hood region, Oregon. US Geological Survey Open-File Report, pp.97-89.
Williams, D.L., Hull, D.A., Ackermann, H.D. and Beeson, M.H., 1982. The Mt. Hood region: volcanic history, structure, and geothermal energy potential. Journal of Geophysical Research: Solid Earth, 87(B4), pp.2767-2781.
Wise, W.S., 1969. Geology and petrology of the Mt. Hood area: A study of High Cascade volcanism. Geological Society of America Bulletin, 80(6), pp.969-1006.
Mt Hood Volcano Eruptions
1907?, 1869?, 1865-66, 1859, 1854?, 1853?, 1795 ± 5 yr, 1765 ± 5, 390 ± 150, 510 AD ± 150, 300 AD ± 200, 4940 BC ± 150.