TY - JOUR
T1 - Source parameters inversion of the 2013 Lushan earthquake by combining teleseismic waveforms and local seismograms
AU - Xie, ZuJun
AU - Jin, BiKai K.
AU - Zheng, Yong
AU - Ge, Can
AU - Xiong, Xiong
AU - Xiong, Cheng
AU - Hsu, HouTze T.
PY - 2013
Y1 - 2013
N2 - On April 20, 2013, a magnitude M s7.0 earthquake occurred in Lushan, Sichuan Province, China, and caused heavy casualties and economic losses. Based on the local broadband waveforms in Sichuan and adjacent provinces regional networks and teleseismic broadband records from IRIS stations, the focal mechanism and the focal depth are determined by the CAP (Cut And Paste) and its upgraded methods, CAPtele and CAPjoint, respectively. The results show that the focal mechanisms and depth from different methods are steady, and the best double couple solution derived from the joint inversion is 210°, 44°, and 91° for strike, dip, and rake angles respectively for one nodal plane and 29°, 46°, and 89° for another with 16 km focal depth and M w6.66 moment magnitude. In order to verify the reliability of the results, a number of tests are performed based on local seismograms with different velocity models. They indicate that there is about 10 degree's fluctuation in focal mechanisms and about 2 km variation in focal depth with a complex velocity structure. Furthermore, inverted by re-sampling the teleseismic waveforms on the basis of epicentral distance, the solutions are consistent with each other, which manifests that the teleseismic records are effective for constraining source parameters of the Lushan earthquake.
AB - On April 20, 2013, a magnitude M s7.0 earthquake occurred in Lushan, Sichuan Province, China, and caused heavy casualties and economic losses. Based on the local broadband waveforms in Sichuan and adjacent provinces regional networks and teleseismic broadband records from IRIS stations, the focal mechanism and the focal depth are determined by the CAP (Cut And Paste) and its upgraded methods, CAPtele and CAPjoint, respectively. The results show that the focal mechanisms and depth from different methods are steady, and the best double couple solution derived from the joint inversion is 210°, 44°, and 91° for strike, dip, and rake angles respectively for one nodal plane and 29°, 46°, and 89° for another with 16 km focal depth and M w6.66 moment magnitude. In order to verify the reliability of the results, a number of tests are performed based on local seismograms with different velocity models. They indicate that there is about 10 degree's fluctuation in focal mechanisms and about 2 km variation in focal depth with a complex velocity structure. Furthermore, inverted by re-sampling the teleseismic waveforms on the basis of epicentral distance, the solutions are consistent with each other, which manifests that the teleseismic records are effective for constraining source parameters of the Lushan earthquake.
KW - CAP method
KW - focal depth
KW - focal mechanism
KW - Lushan earthquake
UR - http://www.scopus.com/inward/record.url?scp=84880834756&partnerID=8YFLogxK
U2 - 10.1007/s11430-013-4640-3
DO - 10.1007/s11430-013-4640-3
M3 - Article
AN - SCOPUS:84880834756
SN - 1674-7313
VL - 56
SP - 1177
EP - 1186
JO - Science China Earth Sciences
JF - Science China Earth Sciences
IS - 7
ER -