结果表明，震前的地震活动性表现出一定的异常。
The results show that there are some anomalies in seismicities before the earthquake.
做好震前的准备工作是提高风险管理水平、保证震后应急工作有效性的重要因素。
Doing well preparing work before earthquake strikes is an important factor for advancing level of risk management and ensuring validity of post-disaster emergency.
本文对思茅、普洱地震区1972年——1981年期间，强震前的小震活动图象进行了分析讨论。发现，中强震前有震面积百分比逐渐增高，在达到峰值时往往有强震发生。
In this paper, activity patterns of small earthquakes before strong ones in the Simao-Puer seismic area during 1972-1981 have been analysed and discussed.
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