|
The entire north face of the volcano was blown away and a dome has built up in the caldera since the 1980 eruption.
In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Washington, in the United States. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on the mountain's north slope.
Please share your ideas with us.
Wikiplacemarks.com
Android Apps
Placemarks
Login
Faq
Language