构造环境应力场在确定新疆地震危险区中的应用  

APPLICATION OF TECTONIC AMBIENT STRESS FIELD TO DETERMINING SEISMIC RISK REGION IN XINJIANG

作　　者：陈培善[1] 白彤霞[1] 

机构地区：[1]国家地震局地球物理研究所,北京100081

出　　处：《内陆地震》1998年第1期1-12,共12页Inland Earthquake

摘　　要：基于断裂力学的研究成果和位错理论，提出了断裂力学地震破裂模式，进而推导出了几个从地震波观测资料直接计算震源处构造环境剪应力场量值τ０ 的公式。根据这些公式计算了中国地区中小地震的构造环境剪应力值。结果表明：τ０ 值的大小与分布和大震发生的地点有密切的关系，即剪应力水平较高的地区将容易发生大地震，而剪应力水平较低的地区通常只发生小地震。据此，从１９９２ 年开始，根据环境应力场进行寻找地震危险区的尝试总有效率达７０％ 。把此法用于新疆地区。Based on the research outcome of fracture mechanics and dislocation theory,the seismic rupture model of fracture mechanics is raised,thus deriving several formulae for direct calculation of τ 0,value of tectonic ambient shear stress field.The tectonic ambient shear stress values of moderate minor earthquakes in China are computed in terms of these formulae.The result shows that the value and distribution of τ 0 are closely related with the location of a large earthquake,namely,a large earthquake more easily occurs in an area with high shear stress level,and the inverse is true.According to this knowledge,we have tried to look for seismic risk regions on the basis of ambient stress field since 1992,total effective rate hitting 70 percent. And this method is of same good effects when it is applied to the Xinjiang area.

关 键 词：构造应力场 地震危险区 地震预报 地震破裂模式 

分 类 号：P315.2[天文地球—地震学] P315.7[天文地球—固体地球物理学]