Identification of the dislocation which moved by an earthquake and mechanism elucidation of the huge tsunami(地震で動いた断層の特定や巨大津波のメカニズム解明)

The study teams such as the marine research and development mechanism announced that I succeeded in gathering plate (rock board covering the earth) boundary stratum in the digging investigation of the bottom of the sea which caused a giant earthquake, a tsunami by East Japan great earthquake disaster on 25th. I will push forward identification of the dislocation which moved by an earthquake and the mechanism elucidation of the huge tsunami in future.
The digging investigation is carried out in an offshore 220 kilos meter of Miyagi for from April 1 to this month 24. Dug the bottom of the sea of 6,890 meters of depth of the water of up to 50 meters of neighborhood of Japan Trough that I moved 850 meters by East Japan great earthquake disaster in earth deep part exploration ship "Tikyu" and gathered stratum in section of approximately 200 meters including the plate border (820 meters of bottom of the sea bottoms).
On the plate border, the trace that was strongly crushed was found, but cannot pinpoint whether it is the thing caused by the earthquake. In addition, dislocation was found in 720 meters of bottom of the sea bottoms. Even if the external elucidation of the earthquake advances, it will be important that I find out an internal cause. This may be more important.



海洋研究開発機構などの研究チームは２５日、東日本大震災で巨大地震・津波を引き起こした海底の掘削調査で、プレート（地球を覆う岩板）境界の地層を採取することに成功したと発表した。　今後、地震で動いた断層の特定や巨大津波のメカニズム解明を進める。
　掘削調査は４月１日～今月２４日、宮城県の沖合２２０キロ・メートルで実施。東日本大震災で最大５０メートル動いた日本海溝付近の水深６８９０メートルの海底を、地球深部探査船「ちきゅう」で８５０メートル掘り進め、プレート境界（海底下８２０メートル）を含む約２００メートルの区間で地層を採取した。
　プレート境界では、強く破砕された痕跡が見つかったが、地震によるものかどうかは特定できていない。また、海底下７２０メートルにも断層が見つかった。地震の外的な解明は進むでしょうが、内的な原因を探し出すことも重要でしょうね。こちらのほうが重要かもしれませんね。