Prediction of volcanic activity, and volcanic eruption forecasting, is an interdisciplinary monitoring and research effort to predict the time and severity of a volcano's eruption. Of particular impor
Mount St. Helens erupted explosively on May 18, 1980, at 8:32 a.m. PDT
Gas and ash plume erupted from Mount Pinatubo, Philippines.
Mount St. Helens
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Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It lies 52 miles northeast of Portland, Oregon, and 98 miles s
Prediction of volcanic activity
…if accompanied by an increase in sulfur dioxide emissions and harmonic tremors is a high probability sign of an impending event. The deformation of Mount St. Helens prior to the May 18, 1980 eruption was a classic example of deformation, as the north side of the volcano was bulging upwards as magma was building up…
3,000 ft (900 m) high steam plume on May 19, 1982, two years and a day after the 1980 major eruption that created the visible gap on the north side of the mountain
Mount St. Helens pictured the day before the 1980 eruption, which removed much of the northern face of the mountain, leaving a large crater
Aerial view with Mount Adams in background
East Dome on the east flank of Mount St. Helens in 2013.