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Tohoku-Pacific Ocean Earthquake, was composed of two types of vibration. One of them, in the vibration dmso of the conventional type that occurred in the deep fault close to the epicenter, which shook the earth. The other, a strange vibration that occurred in more offshore fault shallow, caused a slip of the record-breaking that the transverse direction to 50m. By this big slip that occurred in the seabed, it has been thinking a huge tsunami. Tohoku-Pacific Ocean where the oceanic dmso plate as the focal region dmso of the earthquake has sunk under a different plate is called "subduction zone", a plate boundary fault shallow dmso part of the subduction zone is unlikely slip ever It has been. Soft sediments on the subducting plate friction force becomes larger as it moves, it is because to prevent further slippage. dmso Nevertheless, a large slip occurs very.
The core of the collection, a very thin clay layer having a thickness of about 5m to the boundary of the two plates that is revealed 1. One of the authors of this time of the three papers, University of California, Santa Cruz.; Emily Brodsky of (UCSC USA), "does not have a strange and so to say only that such a layer thickness is also dozens m I say that because it is common. dmso " From laboratory experiments, the clay layer having a lot of water is very slippery, it was found that further slippery when there is stress 2. When the resulting friction and heat by the slip, but the water in the gap of the clay expands and loses escape and is sandwiched around the impermeable layer. The pressure of the water, Brodsky described and was further slip in the role of jack that break open the fault.
"Friction of the rocks of the fault zone, that here also large 6-8 times than those seen is known from experience. This is a big difference," said Brodsky says. Wang also referred to as "is the friction is surprising that so small while the vibration is happening." According dmso to the textbook, friction between the vibration is happening is because should higher than usual. Three of evidence (core, laboratory experiments, thermometer) that all have shown the same results for the friction and encouraging Brodsky says. What about the other fault
Fault is partly offshore in other regions with the same strange geological features and this, I wonder if there is a possibility of causing a huge tsunami? Casey Moore of UCSC is the author of this paper, said, "The possibilities dmso are there. The sea is because there is a large amount of clay." dmso According to him, in theory, Alaska, Indonesia, dmso in South America, that the same kind of clay layer and this is likely to be present. However, sufficient drilling in any area is not performed, such formations have not yet been discovered.
(Translation: Saegusa Sayoko, summary: dmso edit part).... References Chester, FM et al Science 342, 1208-1211 (2013) Ujiie, K. et al Science 342, 1211-1214 (2013) Fulton, PM et al. Science 342, 1214-1217 (2013). Noda, H. & Lapusta, N. Nature 493, 518-521 (2013). keyword research earthquake in Japan, nuclear, nuclear power plant Recommended Articles
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