1992年4月23日缅甸6.7、6.9级地震的近场异常变化特征

本文通过对１９９２年４月２３日缅甸６．７、６．９级地震前近场区异常研究，发现该地震在澜沧、耿马地震后，中小地震区域活动水平一直较高，表现为地震频度和应变释放一直较同，并形成了地震空区。震前３个月开始，震源区的频度增加，应变释放加速显著，近场区的短期前兆异常也较突出。笔者对这些特征进行了一定剖析。

ANOMALOUS VARIATION OF NEAR FIELD ON EARTHQUAKES WITH M=6.7 AND 6.9 OCURRED ON APRIL 23 OF 1892 IN BURMA

The anomalous study of near field region before the M=6.7 and 6.9 earthquakes on Apr. 23, 1992 in Burma shows that moderate-small earthquakes had constant high level within the near field region after the Lancang-Gengma earthquakes which displayed high frequency and strain release, forming seismic gaps. Three months before the earthquakes frequency increased and strain release obviously accelerated in the source region, and short-term precursory anomalies was also protruding in the near field region. The authors have analysed those features to some extent.