Man-madeearthquake is one of the important methods to investigate deep crustal tectonics.
人工地震是研究深部构造的重要方法之一。
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All of them took place at the Punggye-ri site, the same area where several monitoring agencies detected man-madeearthquake activity on Wednesday morning.
这三次核试验都是在丰溪里核试验场进行的。星期三上午,几个监督机构都在该地区监测到了人为地震活动。
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Before the disaster, I thought I was a brave man. The earthquakemade me realize the truth.