second-order fault meaning in English

次级断层

Having analyzed preliminarily formation mechanism of these common characteristics of anomaly , it concludes that : these are results , controlled by basically united tectonic stress field of large - range , caused by stress - strain accumulation and certain phase strong earthquakes , according to deformation difference brought about in tectonic position along the boundary zone and within second - order faults of active blocks resulted from unstable and inharmonious features for movement of block system at different levels and deformation of boundary
分析这些异常共性特徵的形成机制，初步认为：是在基本统一的大区域构造应力场控制下，不同层次块体系统运动及其边界带变形的非平稳、非协调性，在活动地块边界地带和地块内部次级断裂构造部位产生变形差异而导致应力-应变积累、孕育强震到一定阶段的结果。