This afternoon, they have had a big earthquake with magnitude 7.1 in Kumamoto Pref, an area of southwest Japan. It has left extensive damages in the wide area. At a big shopping mall, the 2nd floor has collapsed and dozens of people, mainly the personnel, have been confined in the building. A high way was destroyed. Houses fell apart. No exact number of casualties is not reported yet. It is quite plausible that large number of people have been killed or injured.
I could not seismologically explain what has caused it. There is, however, the Median Tectonic Line, MTL, crossing Kumamoto Pref. MTL is recognized as a geological terminology but a fault, running from the central part to the southwestern part of our country. There have been a number of big earhquakes at various places along it in hundreds of years interval. It is really the largest fault.
Around this earthquake epicenter, there are 3 nuclear power plants, NPPs, located. Actually, 3 of them are running at present. Ikata NPP is very close to MTL, only 6km away from it, in Ehime Pref. of Shikoku Island. It is an isolated place where they could hardly rescue or support the NPP once a serious accident should occur. In addition to the other 2 NPPs, it should be stopped as soon as possible. Actually, only 10 years ago, they have had a couple of big earthquakes comparable to this one. The faults directly cause earthquakes are not MTL itself but it is highly suspected the area along MTL is "activated" now. At least, in geological time span.
Needless to say, the people affected by this disaster should be rescued soon. Without life line, it might be very tough for them to get through the situation in this hottest season of a year.
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