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。
Precursors to volcanic eruptions include strong earthquake swarms and rapid ground deformation and typically take place days to weeks before an actual eruption.
伽师强震群的破裂断层面为北东向，与震源深度梯度变化带、地壳接触变形梯度变化带、等烈度线以及地震扩展方向吻合；
The rupture surface is to NNE, similar to gradient belt of focal depth, gradient belt of crustal deformation, isoseisms and extended direction of earthquakes.
华南地区在中强震发生前有4级左右地震频繁活动和小震群频发的特点。
Before the moderately strong earthquakes in the region there are frequent seismic activity with magnitude of 4 or so and small earthquake swarms.
最后，简要叙述了震群发生过程中根据震群特征作出的无强震预报，及由此得到的良好社会经济效果。
Lastly, a brief account has been given on a non-strong earthquake prediction made in the light of swarm characteristics during the time, and on its satisfactory social and economic results afterward.
最后，简要叙述了震群发生过程中根据震群特征作出的无强震预报，及由此得到的良好社会经济效果。
Lastly, a brief account has been given on a non-strong earthquake prediction made in the light of swarm characteristics during the time, and on its satisfactory social and economic results afterward.
应用推荐