摘要
几个发生在较大规模拉分区附近的强震或特大地震震中区的构造分析表明:拉分区内部张剪切断层与新活动幅度大的次级走滑断层的交汇部位是强震或特大地震的发生场所。据库仑破裂准则及实验结果,对内部张剪切断层的力学成因机制进行了分析,认为内部张剪切断层是次级走滑断层所夹持的块体在简单剪切作用下,块体内部发育的里氏破裂。并从统计、地质方面的研究结果提出了内部张剪切断层的形成条件。
The analysis on structures of several strong earthquake (Ms≥8)epicentral regios shows; the position, where Internal Tensile Shear Fault(ITSF)intersects with Secondary Strike—slip Fault (SF) with larger displacemental amplitude than another one in a pull—apart basin which consists of both of them), is the place where strongest earthquake (Ms≥8)will occur. Genesis of ITSF is discussed based on Coulomb Shear Failure Criteria and results of Clay Box Shear experiment. The Author suggests that the ITSF is Riedel Shear Fracture within a block which is under simple shearing. Finially, the formational geometric conditions of ITSF are discussed according to statistics, geological and geomorphological research results.
出处
《华北地震科学》
北大核心
1993年第1期11-18,共8页
North China Earthquake Sciences
