Introduction to Mount St. Helens

Filed under: Uncategorized — Sarah Ficke at 9:11 pm on Monday, November 8, 2010

The May 18, 1980 eruption of Mount St. Helens–a stratovolcano located in Washington state–was the only major volcanic eruption to occur in the contiguous  United States since 1915. At 8:32 am, PDT, an earthquake caused the mountain’s north flank, already weakened by months of small earthquakes and eruptions, to break away, releasing a violent conglomeration […]