Based on this, the comprehensive prediction indexes before the moderately strong earthquakes in Shanxi area were analyzed.
在此基础上，对山西地区中强地震前的综合预报指标进行了研究。
Before the moderately strong earthquakes in the region there are frequent seismic activity with magnitude of 4 or so and small earthquake swarms.
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。
The result shows that there are obviously anomaly zones of a value with better prediction ability, in mid term of 2 ~ 3 years before most moderately strong earthquakes.
结果表明：绝大部分中强以上地震前2 ~ 3年，在未来震中周围出现较大范围的A值中期异常区域，有很好的预报效果。
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