Study on Evaluation of Occurrence Area of Secondary Fault by the Elastic Theory of Dislocations

Abstract

Predicting the location of surface faults is essential for countermeasures against surface fault displacement. However, it is difficult to estimate the location of secondary faults that accompany earthquake fault activity. Because the secondary faults are caused by the rupture of the rock mass near the ground surface, it is possible to estimate the secondary fault activity by evaluating the seismic stress of the rock mass in shallow areas. In this paper, we have evaluated the area of occurrence of the secondary faults using the local safety factor, which is defined by the ratio of stress to strength, calculated by the elastic theory of dislocations.