1980 eruption of Mount St. Helens
On May 18, 1980, Mount St. Helens in Washington erupted. The eruption was recorded as a 5 on the Volcanic Explosivity Index.[1]
For two months before the eruption, earthquake trembles and steam was vented from the mouth of the volcano. 57 people died in the eruption.[2]
1980 Eruption Of Mount St. Helens Media
USGS photo showing a pre-avalanche eruption on April 10
Photo showing the bulge growing due to a cryptodome on April 27
Sequence of events on May 18
Lakes nearest to Mount St. Helens have been partly covered with fallen trees for more than 40 years. This photograph was taken in 2012.
North Fork Toutle River valley filled with landslide deposits
Computer graphics showing the May 18 landslide (green) being overtaken by the initial pyroclastic flow (red)
Photographer Reid Blackburn's vehicle after the eruption
Many trees in the direct blast zone were snapped off at their bases and the earth was stripped and scorched.
Volcanologist David A. Johnston (pictured 13 hours before his death) was among the approximately 57 people killed in the eruption.
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References
- ↑ Fisher, Richard V.; Heiken, Grant; Hulen, Jeffrey (1998). Volcanoes: Crucibles of Change. Princeton University Press. p. 334. ISBN 0-691-00249-5.
- ↑ Those who lost their lives because of the May 18, 1980 eruption of Mount St. Helens. KGW news. Archived from the original (PDF) on March 26, 2009.
