台湾海峡及其西边地区正常地震动态及危险性特征

本文从地震的时，空分布特征，区域应力场动态，能量释放方式，ｂ值及震群特征６个方面研究了台湾海峡及其西边地区地震活动的正常动态及异常特征。结果表明，具有前兆意义的变化模式表现为区域地震活动在时间，空间及功能方面的有序性变化，即：（ａ）地震空间分布由分散转为集中，形成条带或空区；（ｂ）断裂活动由多组转为单一，应力场趋向一致；（display status

Normal and abnormal behaviour of seismicity in Taiwan Strait and land area to its west

In this paper,the normal and abnormal behaviours of seismicity in the Taiwan Strait and the land area to its west have been studied in terms of the characteristics of seismic space and time distribution,stress field trends,energy release,b value and swarm sequence. The results indicate that the variational pattern of premonitor significance shows the seismicity trend in order in respects of space,time and funtion,i. e., (a) the epicentre tends to concentrate and the band or gap is formed; (b) the fractures turn to monotone; (c) the seismicity level anomaly strengthens and the form of energy release turns to accelerate; (d) b value tendentiously drops, displaying the dropping of energy-dimension; (e) the time distribution of events crowds together; (f) the parameters of earthquake swarms displays abnormal. For earthquake prediction,it will be of significance to study the orientation quantitativety.