溧阳上沛附近浅层物化探探测隐伏断层

DETECTING EPI-TECTONIC WITH GEOPHISICAL AND GEOCHEMICAL TECHNIQUES IN THE EPICENTRAL AREA OF LIYANG EARTHQUAKES

本文基于溧阳震中区精密磁测和a径迹测量结果,探测出茅山东侧断陷盆地内发育北北东向上沛—上姚和北北西向上沛—平桥两组断裂.结合区内地震地质资料综合分析认为:两组断裂可能为茅东断裂带的分支断裂,两次地震余震三度空间分布表明茅东断裂带及其茅东断陷盆地构成溧阳两次地震的孕震构造,而两组断裂交汇破裂与茅东断裂带主破裂在深处的沟通是溧阳地震发生的直接原因.

The epi-tectonie was detected with precise geomagnetic sounding and α-track surveling techniques in the eplcentral area of Liyang earthquakes of Sangpai district.The results abtained with above mentionded show that there are two group faults in the Eastern basin of Maoshan fault,namely Sangpai-Sangyao fault (NNE-striking) and Sangpai-Pinqiao fault (NNW-striking). The authors suggest that both group faults may be the blind branch faults of the Eastern fault zone of Maoshan. The discovery of blind faults in epicentral area is useful to probe the occurrence causes of Liyang earthquakes.