I think a lot of scientists worldwide wondered whether this particular subduction zone - the Japantrench, the southern part - could ever produce a great earthquake.
我想世界上有很多科学家都想知道这一俯冲带——日本海沟南部——是否会发生一次大型地震。
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The threat of earthquakes are not new to the area - the US Geological Survey reported that the Japantrench has had nine earthquakes of 7 magnitude or greater since 1973.