Japanese most deep point

The deepest sea in Japan is introduced with this report.


　The deepest sea in Japan and it are Izu-Ogasawara Trench. It is in the position which went Chiba Prefecture south. It is the trench made when the Pacific plate sank in the Philippine Sea Plate. If the form is very fierce and is compared, that it seems that the dragon is extended from the Japanese Islands will characterize it.
　First, let's see and go from the full length of Izu-Ogasawara Trench. In north, south is extended from Boso Peninsula to the method of the Ogawawara Islands southeast, and the full length can also be about 850 km. If it starts from Tokyo, and you follow land 850 km, it will arrive at Shimane Prefecture in the Chugoku district. Probably, the length of this trench is known now well.
　Next, it is the depth that is worrisome. It is not as the No.1 trench of the world introduced last time and Mariana Trench. However, also in this Izu-Ogasawara Trench, the deepest part can also still be 9780 meters. If Mt. Fuji which is the No.1 mountain of Japan is made reverse, they can also be about 2.5 pieces. This depth is the fifth in the world following Mariana Trench (10924 m), Tonga Trench (10800 m), Philippines Trench (10057 m), and Kermadec Trench (10047 m). Moreover, the name of a trench of Japan is on the list of trenches with the Japan Deep, the main Ryukyu trench, in others.

　It is apprehensive the occurrence of a big earthquake in Izu-Ogasawara Trench in recent years. This crisis cannot be escaped on the characteristic of being generated from two or more plates. However, feeling uneasy is that not direct damage but the massive tsunami by an earthquake occur.
　The earthquake of magnitude 8 levels has actually generated Izu-Ogasawara Trench by comparatively high frequency. Furthermore, if it is magnitude 7 levels, in the near thing, it will have generated near Chichi island in 2010. Since it is in the state always pushed on many plates, it is not wonderful even if an earthquake big when occurs. By the Great East Japan Earthquake which occurred on March 11, 2011, it can be said that the possibility improved markedly.

　When the earthquake has actually occurred in Izu-Ogasawara Trench now, what kind of damage will be brought about concretely? The length of the fault is expected to be 1000 km and 200 km in width. The size of this scale is equal to the dust earthquake and the Sumatra earthquake which occurred in the previous year.  If such an earthquake occurs, it will suffer tsunami damage not only with Japan but serious China, Indonesia, Hawaii, and other countries in the Pacific Ocean.

Great East Japan Earthquake: March 11, 2011

　Japan is the No.1 earthquake power of the world. Existence of this trench will continue to be concerned closely. What will happen to seismic activity of Japan from now on? It can call it an important point. 

reference

• http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1463380969
• http://www1.kaiho.mlit.go.jp/KAIYO/sokuryo/D1/D1.htm
• http://kotobank.jp/
• http://0dt.org/001068.html