It is this week 40 years years ago the Mount Saint Helens in the US erupted
On May 18, 1980 a major volcanic eruption occurred at Mount St. Helens, a volcano located in the state of Washington, United States. The eruption (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.
USGS on Mt St Helens >>>
Mount St Helens now >>>>
Washington Military Department kreflects on the eruption >>>>
Satelite images from Mt ST Helens, 1979 until 2014 >>>>
Janine Krippner on the eruption >>>
Mt St Helens eruption: a geo-animation >>>