The Tsunami Caused by the Great East Japan Earthquake May Have Been Triggered by "Strain" Deep Underground Near the Epicenter, According to Research by the Deep-Sea Drilling Vessel "Chikyu".

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[Yomiuri Shimbun] A survey by the Japan Agency for Marine-Earth Science and Technology and others has revealed that the "strain" that triggers tsunamis has not yet begun to accumulate on the shallow fault surface near the Japan Trench that shifted during the Great East Japan Earthquake. The tsunami at that time was caused by the strong locking of the fault surface shallower than the epicenter, and the release of accumulated strain.