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Planet’s megaquakes caused volcanoes in subduction zones to sink

Posted by zenobiusz w dniu 1 Lipiec 2013


The Extinction Protocol

July 1, 2013GEOLOGYMassive earthquakes can cause distant volcanoes to sink, according to research in Japan and Chile published on Sunday. The magnitude 9.0 tsunami-generating quake that occurred off northeastern Japan in 2011 caused subsidence of up to 15 centimeters (9.3 inches) in a string of volcanoes on the island of Honshu as much as 200 kilometers (120 miles) from the epicenter, a Japanese study said. And the 8.8 magnitude Maule quake in Chile in 2010 caused a similar degree of sinking in five volcanic regions located up to 220km (130 miles) away, according to a US-led paper. It was not clear whether the phenomenon boosted eruption risk, the authors wrote. Both the Japan and Chile quakes were of the subduction type, caused when one part of Earth’s crust slides beneath another. If the movement is not smooth, tension can build up over decades or centuries before…

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