1995～1996年云南三次强震前地震活动的年度异常

通过对地震活动年度预报指标的研究，发现１９９４年云南地区的地震活动异常突出。不仅频度，能量，ｂ值，小震调制比，响应比等常规的地震学参量有异常，而且地震波速比，尾波持续时间比，振幅比和高剪切应力值等均出现异常，异常项目多且幅度大，已具备了强震发生的条件，异常在空间分布上尤以滇西南地区集中，次为滇西北。这些异常为判定１９９５～１９９６年云南三次强震的发生提供了重要依据。

Annual anomalies of seismicity before the three strong earthquakes from 1995 to 1996 in Yunnan

Study on seismicity annual index has found prominent seismicity anomalies in 1994 in Yunnar which not only included conventional seismological items, such as frequency, energy, b value, modulation ratio for small earthquake and response ratio, but also involved seismic wave velocity, continuous the ratio of code wave, amplitude ratio and high shear stress value. The anomalies with multiple items and great extent indicated earthquake would occur. The anomalies in space distribution first were concentrated in the Southwest Yunnan, Second in the Northwest Yunnan. These anomalies provided an important basis for judging the Strong earthquakes occurred in 1995 in Yunnan.