Based on the representation theorem of seismic energy radiation, in this study, we have quantitatively investigated the effect of free surface on the radiation energy distribution due to a coupling interaction between free surface and near surface finite fault for the reverse earthquake faulting. Corresponding to the finite faulting, a 2-D pseudostatic-reverse-fault-dislocation solution has been used in the calculation of the work done by the seismic response against free surface. The results indicate that, due to a strong coupling interaction between the free surface and near surface fault, the total radiated seismic energy E R is much larger than that radiated only from the fault itself (E F ), especially for the shallow reverse faulting. In convention, E F is commonly used in the estimation of earthquake energy radiation. However, when the fault depth H, the distance between the free surface and top of fault location, increases, the effect of the coupling interaction between the fault and free surface decreases gradually. Therefore, the total radiated energy E R approaches to the E F when the depth H is about 2 times the fault length l. The current study could provide us a partial explanation of the apparent stress discrepancy observed at the far field and near field in the recent large earthquake. Moreover, the current study also has a significant implication of how to quantitatively describe the near fault strong ground motion and associated seismic hazard from the earthquake source energy point of view. energy partitioning, representation theorem, thrust fault, apparent stress, response of surface Radiated seismic energy carried by seismic waves is always one of the most meaningful physical parameters for quantifying earthquakes. Compared with another critical parameter --scalar seismic moment, the radiated seismic energy is directly related to the earthquake rupture process, which is correlative to geometry of faults and interaction between faults and free surface of earthquake [1] . Therefore, precise estimation of the radiated energy becomes more complicated and difficult, and limits our further understanding of the earthquake fault rupture process in a certain situation.Based on the representation theorem of seismic radiated energy partition, the elastic wave energy released during a dynamic rupture on the fault and elastic responses of fault block surrounded by a closed surface S o with a volume V can be represented as if we ignore the fracture energy [2]
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.