孕震空区的环境应力特征及其机理探讨  

Research on ambient stress characteristics of seismogenic gap and its mechanism

作　　者：李强[1] 徐戈[1] 杨彩霞[1] 

机构地区：[1]江苏省地震局,江苏南京210014

出　　处：《地震》2005年第3期35-42,共8页Earthquake

基　　金：地震科学联合基金项目(103065)

摘　　要：利用地震波资料对几个典型震例孕震空区的环境应力特征进行了研究,并对其机理进行了探讨。研究结果显示,逼近地震的环境应力值高于同时期构成空区的一般性(非主震震源区附近)小震,发生在未来主震震源区及附近小震的环境应力值较高等。上述结果的机理可用坚固体模型来解释。研究结果有助于提高孕震空区的预报效能,进一步提高对地震孕育过程中力学机理的认识。In this paper, the ambient stress characteristics of seismogenic gap from several earthquake examples by using digital earthquake data are studied and its mechanism is discussed. It is indicated that the ambient stress approaching an earthquake is higher than that of usually small earthquakes （not near the focal zone of main earthquake） which form seismogenic gap at same period, and that the ambient stress of the small earthquakes near the focal zone of main earthquake is higher. The mechanism described above can be explained by the hard inclusion model. The conclusion of this research can be of great significance to improve forecast efficiency of seismogenic gap and increase the cognition of mechanic mechanism in the process of earthquake preparation.

关 键 词：地震活动图像 孕震空区 应力 机理 

分 类 号：P315.7[天文地球—地震学]