日本海嘯是由三十公尺斷層移動引起

Recently the NHK News reported the following:
東北の太平洋沿岸で起きた巨大地震は、岩手県沖から茨城県沖の海底で南北４５０キロメートルにわたる断層が、最大で３０メートルずれ動いて引き起こされたことが、気象庁の解析で分かりました。
気象庁は２５日の記者会見で、国内や海外で観測された地震計のデータを基に、今回の巨大地震がどのようにして起こったか解析した結果を公表しました。それによりますと、断層の破壊は宮城県沖で始まり、北側の岩手県沖におよそ２００キロ、南側の福島県沖におよそ１５０キロ、それぞれ断層がずれ動きました。その直後、さらに南側の茨城県沖に向けて断層がおよそ１００キロずれ動き、およそ３分間に岩手県沖から茨城県沖の南北４５０キロの断層が最大で３０メートルずれ動いたことで、マグニチュード９．０の巨大地震が引き起こされ、１０メートルを超える大津波が東北の太平洋沿岸を襲ったことが分かりました。気象庁の横田崇地震予知情報課長は「今後も巨大地震やその後の余震などの解析を続け、地震の全体像を明らかにすることで、防災対応に生かしたい」と話しています。

(試譯文)
From the analysis done by the Meteorological Agency, it was understood that the massive earthquake that occurred in the Pacific Ocean north east coast was caused by a shift movement of up to 30 meters happened at the 450-kilometer north to south fault at the bottom of the sea from the Iwate Prefecture offing to the Ibaraki Prefecture offing.

On the 25th the Meteorological Agency at a press conference made public the result of their analysis on how this massive earthquake had happened, based on the seismograph data observed in the country and in foreign countries. According to it, the destruction of the fault started in the Miyagi Prefecture offing; individually the approximately 200-kilo long fault located at the north at the Iwate Prefecture offing, and the approximately 150-kilo long fault at the south at the Fukushima Prefecture offing shifted; immediately after that, the approximately 100-kilo long fault at further south at the Ibaraki Prefecture offing also moved; in about three minutes, this 450-kilo north south fault that started from the Iwate Prefecture offing to the Ibaraki Prefecture offing shifted up to a maximum of 30 meters; it was understood that the massive earthquake of 9.0 magnitude occurred had caused the tsunami that exceeded ten meters which overwhelmed the Pacific Ocean north east coast. Takashi Yokota the director of the Earthquake Prediction Division of the Meteorological Agency said that "In future, I hope to contribute towards disaster prevention and response through continuing analyzing the massive earthquake and the aftershock etc, and through understanding the full image of the earthquake".

According to the experts in Japan, it is a 30-meter shift in the fault that has caused the tsunami.