龙羊峡周围地区地壳应力场及地震危险性探讨

APPROACH ON CRUSTAL STRESS FIELD AND SEISMIC RISK AROUND THE LONGYANGXIA REGION

本文利用震源机制资料对龙羊峡及附近地区的地壳应力场和构造进行了反演，结果表明，该地区主压应力以北东或北东东方向占优势，构造主要是北西向。同时根据南北带强震时空特征、共和地震序列及青海东部部分震兆资料对该地区的地震危险性做了粗略的估计。

The crustal stress field and the tectonic distribution in the Longyangxia region and its adjacentarea were made a inversion using focal mechanism data in this poper. The results show that the dominant direction of Principal compressive stress is the NE or NEE direction and the tectonic strike is themajor NW direction, moreover, the seismic risk was rough esthated in basis of the time-space charactetistics of strong earthquake in the Notth-South seismic belt, the seismic sequence of Gonghe earthqude and a Part of earthquake precursors in the east of Qinghai