Chilean and Japanese Volcanoes

Chilean and Japanese Volcanoes settle after strong earthquakes

According to the data received by the satellite of ALOS, five Japanese volcanoes settled on the average on 15 centimeters in comparison with the sizes only a few years ago. All of these volcanoes settled down on the island of Honshu at distance of 200 kilometers from earthquake epicenter. As the precondition subsidence was served by an earthquake of 2011. The same happened after an earthquake measuring 8,8 points by the Richter scale to all Chilean volcanoes located in a zone with a diameter of 400 kilometers from epicenter. The similar effect appeared quite normal consequence of strong earthquakes. By the words of Matt Pritchard from CornellUniversity in New York they have all bases to believe that this is very widespread phenomenon. Earlier the scientists couldn’t notice it as devices of satellites were insufficiently sensitive to transfer exact pictures. Pritchard and his colleagues used data of the ALOS satellite on five volcanoes located in the southern part of the mountain Andes system. They were interested in the pictures received till the earthquake measuring 9,0 points by the Richter scale, happened  on February 27, 2010. It became clear that volcanoes settled on 15 centimeters in only some weeks after natural disaster. Youichiro Takada and Yo Fukushima from KyotoUniversity used data of the same satellite to study Japanese volcanoes on the largest island of the archipelago of Honshu. The pictures made next day after a powerful earthquake of 2011 in this region, showed that Japanese volcanoes settled on the same 15 centimeters, as Chilean. That is the true reason of subsidence while is unclear, but both groups of researchers have versions of the events. Pritchard believes that the strong earthquakes cause expansion of cracks in volcanic breeds that allows underground waters to break to a surface, because of what there is a subsidence. The Pritchard’s work also showed that two Chilean strong earthquakes which happened in 1906 and 1960, also caused subsidence of volcanoes in a disaster zone in a year after happened. Takada and Fukushima have other hypothesis. They consider that tremors deform magmatic pools of volcanoes owing to what stones on a surface settle.
source:www.livescience.com