Researchers have classified 18 US volcanoes as threat, due to their action and proximity to people. The United States Geological Survey has updated its assessments of the volcanic threat for the very first time since 2005. The threat list is topped by Hawaii’s Kilauea,that has been erupting this year. The rest at the top 5 are Mount Rainier and Mount St Helens in Washington, Alaska’s Redoubt volcano and California’s Mount Shasta. This report could come as a surprise to most, but not to rdquo, & volcanologists, said Concord University volcano expert Janine Krippner. The US is among the most active nations in the world with regards to volcanic action.
She said, noting there were 120 eruptions in US volcanoes since 1980. Kilauea is the most active volcano in the US and it has got a great deal of development right on its own flanks, said authorities volcanologist John Ewert, the report’s chief author. He said Hawaii, Hilo, is the biggest town in the United States at a danger zone for a high threat volcano, Mauna Loa. Eleven of the 18 high threat volcanoes have been in Oregon, Washington and California. Washington’s Mount Rainier has the highest number of people in the downstream hazard zone, with about 300, 000 people, said USGS geologist Angie Diefenbach, a report co-author.
Flagstaff, Arizona, is on the boundary of the large San Francisco, California Volcanic Field that is in the moderate threat level Ewert said. Government scientists use two dozen factors to calculate a general threat score for all the 161 young active volcanoes in the country. The score is based on the kind of volcano, how volatile it may be, how lately it’s been active, how often it erupts, if there’s been seismic action, how many men and women live nearby, if the evacuations have occurred in the past and if the eruptions disrupt the air traffic. They’re then sorted into five threat levels, which range from very low to very high.
A number of the volcanoes in the Cascades of Oregon and Washington have few, if any, direct monitoring beyond 1 or 2 seismometers. Since of past action, Alaska volcanoes have a tendency to have more extensive monitoring system. Said Tom Murray, the USGS volcano science centre director. The USGS reported a dozen volcanoes have jumped into danger level. Twenty others dropped at risk level. Including Salton Buttes in Four peaked and California in Alaska. Not one of the Big 18 shifted even though 11 had entire danger scores falling. Threat scores and amounts alter because of better info regarding the volcanoes, Klemetti said. Among those in which the danger scores – although not the danger level – is higher are Alaska’s Redoubt, Mount Okmok, Akutan Island and Mount Spurr. Aside from the top five, the rest of the large 18 are: Mount Hood, Three Sisters and Crater Lake in Oregon, Akutan Island, Makushin, Mount Spurr and Augustine in Alaska, Lassen and Long Valley in California, Mount Baker and Glacier Peak at Washington, and Mauna.
There has been a lot of speculation of a super eruption at Yellowstone, but Mike Poland, the scientist in charge of the Yellowstone Volcano Observatory, said: “We don’t really have any indication that Yellowstone is doing anything abnormal.”