芜湖长江大桥桥位地壳活动及地震危险性评价

在芜湖长江大桥场地地震安全评价工作中，通过构造地貌，主要断裂活动性和断错物质微观运动特性标志等方面系统研究，结合地震活动时空特征分析，对该大桥及邻区地壳活动性进行了综合评价。研究结果表明，中生代一新生代早期，研究区地壳活动强烈，新生代晚期以来活动强度明显减弱，以块体之间差异升降为其主要活动特性，地壳能量是以小震方式断续释放，桥位所在地属相对稳定地段，适宜于构建芜湖长江大桥这一特大型工程，该研究为弱震区活动习性和地震危险性评价提供了一范例。

EVALUATION OF CRUSTAL ACTIVE BEHAVI0UR AND SEISMIC HAZARD IN BRIDGE L0CAT10N OF WUHU CHANGJIANG BRIDGE

During seismic safty evaluation of Wuhu Changjiang Bridge,by means 0f studying totectonic landf0rm,main faults activity,micr0sc0pic sliding behaviour of fault materials andtime-space character of seismic activity, the authors have evaluated synthetically tocrustal active behaviour in Wuhu Changjiang Bridge and its neighboring areas Mz-EarlyKzsince Late-Kz, and f0und the crustal main active character is abviously weaker,sl0wchanges and up-d0wn the crustal main active character,the crustal energies are releasedslowly as small-earthquakes. The place located the bridge is relative stable area,which isfit to build the large bridge. It is put f0rword 'an example for researching to crustal activityand seismic hazard in weak seismic area.