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.

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。

youdao

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.

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。

youdao