广西及邻区地震活动特征及异常分析

通过对广西及邻区(以下简称研究区)地震活动的背景,包括研究区地震活动特征、断裂带的分布、主压应力轴方向与强震发生的主体地区、地震活动时空扫描异常特点、强震发生的时间特点进行了分析,说明该地区存在发生中强震的可能。并对2004年广东阳江4.9级2、005年云南文山5.3级、2005年广西平果4.4级地震前的异常进行了分析,说明研究区地震活动特征显著。同时获得了区域中强以上地震前的主要异常指标,对今后地震预测有一定指导意义。

CHARACTERISTICS OF SEISMICITY AND ANOMALIES IN GUANGXI AND ITS NEIGHBORING REGIONS

Back ground of seismic activity in Guangxi and its neighboring regions is analyzed,including characteristics of seismic activity,distribution of fault zones,aspect of chief press axes,main region of strong shocks and time-space anomaly features.The result shows that the moderate earthquakes may be occurred in Guangxi and its neighboring regions.The precursory anomalies of Yangjiang earthquake with M_L4.9 in 2004 in Guangdong province,Wenshan earthquake with(M_L5.3) in 2005 in Yunnan province,Pingguo earthquake with M_L4.4 in 2005 in Guangxi are also analyzed,and the result shows that the characteristics of the seismicity in the studied region are obviously strong,and the main anomaly indexes obtained in the region are helpful to earthquake predition.