【摘要】 利用"八五"、"九五"地震预报攻关研究的成果,对1987年寻乌MS5 5级地震前的地震活动性异常特征进行了再研究,结果表明,此次地震前出现小震活动空区、地震活动"增强—平静"、前兆性震群活动等多项明显的地震活动性异常,这些异常还表现出一些中期向短期过渡的特征,对将来主震的中短期预测具有一定的参考价值。更多还原

【Abstract】 In this paper, based on the results of the earthquake prediction researches in’8th five years plan’ and ’9th five years plan’, the abnormal characteristic of seismicity before the Xunwu earthquake with magnitude MS55 in 1987 is researched again. It is found that there had been some evident abnormities before the earthquake, such as seismicity gaps, strengthening- tranquilizing of the seismic activity, precursor seismic swarms etc. These abnormities showed a feature that they were from medium anomaly to short anomaly. The facts mentioned above are very useful to predict main shock in future.更多还原