抚边河断裂新活动特征的探讨

Discussion on the RecentActiv6Feature of the Fubianhe Fault

抚边河断裂是一条在区域地质图上未标明的隐伏断裂，属小金弧形构造西翼的构造成分。在晚更新世晚期以来，该断裂具有较明显的新活动性，并使抚边河两岸的Ⅱ级阶地不对称，历史上该断裂曾发生过三次中强地震，最大者为１９８９年９月２２日小金６．６级地震，表明具备发生７．ｏ级大震的潜在能力。查明该断裂的新活动特征不但有助于隐伏断裂新活动性研究方法的探索，而且有助于进一步认识川青块体内部弧形构造的发震规律。

The Fubianhe fault,whch is not marked on a regional geological map,is a subsurfacestructure and a part of the west wing of the Xiaojin arcuate structure,The fault has appearedmore obviours activeness and made the third class terrace,along the Fubian river,unsym-metrical since the end of Late Pleistocene Epoch.Three medium-strong earthquakes occurredalong the fault, and the most one is the Sept.22,1989 M6. 6 Xiaojin earthquake,It may beconsidered that the Fubianhe fault has the latent capability of M7.0 earthquake occurring。The recent active feature investigation of the subsurface Fubianhe fault is better either to dis-cover the study method of subsurface fault activeness or to further comprehend the seismo-genic regularity of arcuate structure in the Sichuan-Qinhai block。