Migration of the seismic activity is found before a big event.
发现了大震前地震活动性的迁移。
Seismic activity of the Eurasian belt was basically calm during this quarter.
亚欧带本季度地震活动基本平静。
Seismic activity is one of the prime early warning signals of volcanic hazard.
地震活动是火山喷发的主要前兆之一。
Seismic activity is one of the prime early warning signals of volcanic hazard.
地震活动是火山喷发的主要前兆之一。
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