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2015年发生在智利Coquimbo的M_w8.3级地震是一个典型的俯冲带地震,其大小、破裂滑移分布与利用震间期GPS观测得到的智利南部俯冲带闭锁模型一致.利用反投影方法得到的破裂过程初步解显示,这次地震的破裂由震中(约25 km深)向浅部传播,并且这次地震破裂的能量辐射与频率明显相关,与2010年发生在Coquimbo地震破裂南部约50 km的M_w8.8级地震的观测结果一致,表明这部分俯冲带的断层性质随深度存在着系统变化.这次2015年8.3级地震的震前及同震观测资料将对地震破裂动力学的数值模拟提供一个难得的模型约束信息.
The M_w8.3 earthquake, which occurred in Coquimbo, Chile in 2015, is a typical subduction zone earthquake whose size and fracture slip distribution is in accordance with the model of the southern Chile subduction zone closure observed by GPS in the inter-seismological period.Using the backprojection method, The initial solution of the rupture process shows that the earthquake ruptured from the epicenter (about 25 km deep) to the shallow part, and the energy radiation of this earthquake rupture was obviously related to the frequency. Compared with the frequency of about 50 km in the southern part of the Coquimbo earthquake rupture in 2010 The observations of the M_w.8.8 earthquake are consistent with each other, indicating that there is systematic variation with depth of the fault properties in this part of the subduction zone. The pre-earthquake and coseismic observations of the 8.3-magnitude earthquake in 2015 will provide numerical simulation of earthquake rupture dynamics A rare model constraint information.