Precursors to volcanic eruptions include strong earthquake swarms and rapid ground deformation and typically take place days to weeks before an actual eruption.
火山喷发前兆，包括在实际爆发强震群和快速地面变形，通常发生几天到几周。
Fifth, there appeared trend anomalies of seismometry results and other microscopic precursors, implying that middle-term risk of strong earthquake exists in the determined monitoring region.
五是测震和其它微观前兆趋势性异常出现，说明所圈定监视区的中期强震危险性存在。
Fifth, there appeared trend anomalies of seismometry results and other microscopic precursors, implying that middle-term risk of strong earthquake exists in the determined monitoring region.
五是测震和其它微观前兆趋势性异常出现，说明所圈定监视区的中期强震危险性存在。
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