July 29, 2013 – ALASKA – When Mount St. Helens erupted explosively in 1980, most people were unaware that the U.S. ranks as one of the top countries in the world in the number of geologically young, active volcanoes. An updated review of the Nation’s active volcanism from 1980 through the end of 2012, however, shows that 107 eruptions occurred at 32 volcanoes (most of which are located in Alaska), and at least 41 episodes of unrest were observed at 13 volcanoes. So far in 2013, four new eruptions have occurred at volcanoes in Alaska (Cleveland, Pavlof, and Veniaminof) and the Commonwealth of Northern Marianas Islands (Pagan), and two eruptions are continuing in Hawai`i at Kilauea Volcano from Halema`uma`u Crater at the summit and the Pu`u `O`o vent 18 km (12 miles) to the east. Also in 2013, various signs of persistent unrest continue at two of the largest volcanoes…
Voir l’article original 311 mots de plus

