{"id":36963,"date":"2013-07-15T01:52:40","date_gmt":"2013-07-15T05:52:40","guid":{"rendered":"http:\/\/planetsave.com\/?p=36963"},"modified":"2013-07-15T01:52:40","modified_gmt":"2013-07-15T05:52:40","slug":"volcanoes-scream-at-ever-increasing-pitches-until-they-erupt-research-finds","status":"publish","type":"post","link":"https:\/\/planetsave.com\/articles\/volcanoes-scream-at-ever-increasing-pitches-until-they-erupt-research-finds\/","title":{"rendered":"Volcanoes 'Scream' At Ever-Increasing Pitches Until They Erupt, Research Finds"},"content":{"rendered":"

Some volcanoes ‘scream’ at ever-higher pitches until erupting — the ‘scream’ being the harmonic tremors that often accompany the earthquakes which typically precede volcanic eruptions, according to new research from the University of Washington and the USGS.<\/p>\n

\""Redoubt<\/a>
“Redoubt Volcano\u2019s active lava dome as it appeared on May 8, 2009. The volcano is in the Aleutian Range about 110 miles south-southwest of Anchorage, Alaska.”
Image Credit: Chris Waythomas, Alaska Volcano Observatory<\/em><\/figcaption><\/figure>\n

The new findings are the result of a new analysis of the March 2009 eruption of Alaska’s Redoubt Volcano — the new analysis found that “the harmonic tremor glided to substantially higher frequencies and then stopped abruptly just before six of the eruptions, five of them coming in succession.”<\/p>\n

“The frequency of this tremor is unusually high for a volcano, and it’s not easily explained by many of the accepted theories,” stated Alicia Hotovec-Ellis, a University of Washington doctoral student in Earth and space sciences. “Documenting the activity gives clues to a volcano’s pressurization right before an explosion. That could help refine models and allow scientists to better understand what happens during eruptive cycles in volcanoes like Redoubt.”<\/p>\n