该理论认为产生震级7-7.5级地震的必要能量来自很久以前在地球地壳积蓄的应力。
The theory suggests that the energy necessary to produce the magnitude 7-7.5 earthquakes came from stored stress built up in the Earth’s crust long ago.
在过去的几个世纪里，仙台沿海地区的俯冲带发生的地震震级最大才达到8级，从未达到过9级，而这次地震释放的能量是8级地震的30倍。
In the past few centuries, the subduction zone off the coast of Sendai has generated earthquakes of up to magnitude 8 or so, but nothing as powerful as a 9, which releases 30 times more energy.
地震本身的大小，用震级表示，根据地震时释放的弹性波能量大小来确定震级，我国一般采用里氏震级。
The size of the earthquake itself, with that magnitude, according to the release of the earthquake wave energy flexibility to determine the size of magnitude, China's general use of the Richter scale.
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