exploding material triggered the may 18 1980 eruption of mount st. helens.
what triggered the may 18 1980 eruption of mount st. helens?
exploding material
on may 18, 1980, a major volcanic eruption occurred at mount st. helens, a volcano located in skamania county, in the u.s. state of washington. the eruption (a vei 5 event) was the most significant volcanic eruption to occur in the contiguous 48 u.s. states since the much smaller 1915 eruption of lassen peak in california. it has often been declared the most disastrous volcanic eruption in u.s. history. 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 large bulge and a fracture system on the mountain's north slope.
1980 eruption of mount st. helens
bullet::::- helenite – an artificial glass marketed as a gemstone, made by fusing the volcanic dust from mount st. helens' may 1980 eruption





























section::::references.





























bullet::::- (adapted public domain text)





























section::::external links.





























bullet::::- list of victims with biographical details





























bullet::::- usgs: mount st. helens 1980 debris avalanche deposit





























bullet::::- usda forest service: mount st. helens volcanocam





























bullet::::- pre-1980 eruptive history of mount st. helens, washington





























bullet::::- usgs: before, during, and after may 18, 1980





























bullet::::- boston.com – the big picture – 30 years later





























bullet::::- aerial pictures of the july 22nd, 1980 secondary eruption
1980 eruption of mount st. helens