Determination of focal depth by two waveformbased methods: A case study for the 2008 Panzhihua earthquake
Zhenjie Wang1, Jiajun Chong1, 2, Sidao Ni3, Barbara Romanowicz2
1 Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei 230026, China 2 Berkeley Seismological Laboratory, 215 McCone Hall, University of California-Berkeley, Berkeley, CA 94720, USA 3 CAS Key Laboratory of Dynamical Geodesy, Institute of Geodesy and Geophysics, Wuhan 430077, China
Determination of focal depth by two waveformbased methods: A case study for the 2008 Panzhihua earthquake
Zhenjie Wang1, Jiajun Chong1, 2, Sidao Ni3, Barbara Romanowicz2
1 Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei 230026, China 2 Berkeley Seismological Laboratory, 215 McCone Hall, University of California-Berkeley, Berkeley, CA 94720, USA 3 CAS Key Laboratory of Dynamical Geodesy, Institute of Geodesy and Geophysics, Wuhan 430077, China
摘要With the 2008 MS6.1 Panzhihua earthquake as a case study, we demonstrate that the focal depth of the main shock can be well constrained with two approaches: (1) using the depth phase sPL and (2) using full waveform inversion of local and teleseismic data. We also show that focal depths can be well constrained using the depth phase sPL with single broadband seismic station. Our study indicates that the main shock is located at a depth of 11 km, much shallower than those from other studies, confirming that the earthquake occurs in upper crust. Aftershocks are located in the depth range of 11–16 km, which is consistent with a ruptured near vertical fault whose width is about 10 km, as expected for an MS6.1 earthquake.
Abstract：With the 2008 MS6.1 Panzhihua earthquake as a case study, we demonstrate that the focal depth of the main shock can be well constrained with two approaches: (1) using the depth phase sPL and (2) using full waveform inversion of local and teleseismic data. We also show that focal depths can be well constrained using the depth phase sPL with single broadband seismic station. Our study indicates that the main shock is located at a depth of 11 km, much shallower than those from other studies, confirming that the earthquake occurs in upper crust. Aftershocks are located in the depth range of 11–16 km, which is consistent with a ruptured near vertical fault whose width is about 10 km, as expected for an MS6.1 earthquake.
基金资助:Joint Seismological Science Foundation of China (No.200808078) and National Natural Science Foundation of China (Nos.40821160549 and 41074032)
通讯作者:
Jiajun Chong
E-mail: jiajunchong@gmail.com
引用本文:
Zhenjie Wang, Jiajun Chong, Sidao Ni, Barbara Romanowicz. Determination of focal depth by two waveformbased methods: A case study for the 2008 Panzhihua earthquake[J]. 《地震学报》英文版, 2011, 24(4): 321-328.
Zhenjie Wang, Jiajun Chong, Sidao Ni, Barbara Romanowicz. Determination of focal depth by two waveformbased methods: A case study for the 2008 Panzhihua earthquake. Earthquake Science, 2011, 24(4): 321-328.
