Mega-earthquakes can sink the volcanoes

August 20, 2013. Experts from Chile and Japan launched a joint study examining the impact of large earthquakes on distant volcanoes. Research topic suggested by nature, because after the strongest quake in northeastern Japan, a magnitude 9.0 (2011) found lower on the whole ridge volcanoes. Honshu, located 200 km from the epicenter. Depth omissions amounted to about 15 cm

Something similar happened on in Chile after the 8.8-magnitude earthquake in Maule (2010). Under the influence of the concussion five volcanic areas, 220 km from the epicenter sank to a depth of approximately 15 to 30 cm long It is not known whether this phenomenon is associated with the approach of the omission of the time involved eruption of volcanoes.

Out of the total data in the event it turned out that both episodes were treated to a subduction earthquakes, where there is a slip of a single layer of the earth's crust beneath the other. If the slide is not smooth, the internal stress can grow and accumulate over decades or even centuries, before it will result in an earthquake. Typically, such an earthquake will have the highest magnitude and incredible destructive power.

A second similar feature was that the omission occurred in the mountain ranges lying horizontally to the plane of the quake. Japanese volcanoes Akitakoma, Kurikoma, Azuma and Nasu as if stretched in the horizontal direction, and then compressed into a vertical. In the Chilean case, the stretch zone is 400 km. Two earthquakes in the subduction zone of Chile in 1906 and 1960. accompanied by a nearly annual eruptions in the southern volcanic zone of the Andes.

This similarity is quite remote events has led scientists to a more detailed study of the relationship of volcanoes and earthquakes. In the near future should consider the movement of magma inside the volcano sinking, which can clarify the causes of subsidence.


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