台湾海峡7.3级地震及其震后地震趋势研究

通过对台海海峡７．３级地震序列研究表明，该地震是一次板内的主－余震型地震，震源机制解确定此次地震是ＮＷ走向断裂的走滑正断层错动；震区地震构造背景和震前的地震活动异常图像与我国东南沿海成一体性，表明属于我国东南涡海地震带的地震活动震前出现多项地震学异常。震兆演化过程存在明显的阶段性，本次地震有一寂的可预测性，根据地震活动分幕结果，认为近期东南沿海的一系列中强震活动属于该带第五活跃幕的地震群体活动并预

STUDY OF THE TAIWAN STRAITS EARTHQUAKE M=7.3 AND THE POST-EARTHQUAKE TENDENCY

The study on sequence of the Taiwan Straits earthquake with M= 7.3 and the fea-tures of source fracture shows that it is an intraplate mainshock-aftershocksequence. The focal mechanism solution determines that the shock represents astrike-slip normal fault dislocation along the northwest-strike. The seismotectonicbackground in the earthquake region and the anomaly pattern of pre-earthquakeseismicity are similar to those in the south-eastern coast of Chinas, so this shock be-longs to the earthquake activity of the Chinese southeast coast earthquake belt. Manyitems of seismological anomalies occurred before this shock, and the process of devel-opment of seismic precursors presented clear stages. This earthquake shows a certainpredictability. According to the division of seismicity episodes, this paper states that aseries of strong earthquakes recently occurred in the southeast coast, which belonged togroup seismicity of 5th active episode in the seismic belt. It is expected that, in thesoutheast coast the moderate-strong seismicity will continue till the end of this century.