利用区域宽频带数据反演鲁甸MS6.5级地震震源破裂过程

Translated title of the contribution: Rupture process of MS6.5 Ludian earthquake constrained by regional broadband seismograms

Cheng Li Liu, Yong Zheng*, Xiong Xiong, Rui Fu, Bin Shan, Fa Qi Diao

*Corresponding author for this work

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Based on the finite fault inversion method, we investigated the rupture process of the 3 August 2014 Ludian MS6.5 earthquake by regional broadband data provided by China Earthquake Administration. The inversion results indicate that the Ludian earthquake occurred on NNW oriented sinistral strike-slip fault, and most of the rupture slips concentrated in the upper left side of the hypocenter with the peak slip of about 0.7 m. The results show that the rupture slip of this earthquake initiated from 11 km and propagated quickly to the shallower depth, and probably could touch the ground surface with a rupture length of 10 km. The total seismic moment released by the whole fault is 1.97×1018 N·m, which is equivalent to magnitude of Mw6.1, and most energy released at the first 15 s. Comparing with ordinary earthquakes, four obvious characteristics can be observed from the Ludian earthquake: (1) The majority of the rupture slips concentrated in the shallow depth (less than 10 km) and the maximum slip occurred at the depth of 3 km, and the rupture could be close to the ground surface, thus the shaking of the ground is very strong. (2) The stress drop is very high. Based on our model, the magnitude of the associated static stress drop of the Ludian earthquake is ~ 2.8 MPa. (3) The fault rupture of the earthquake propagated with a higher velocity, and expands to the surface at a speed of more than 2.5 km·s-1. (4) The mainshock may ruptured a conjugate fault system. These four characteristics might be the main reasons why this earthquake caused massive human casualties and property losses.

Original languageChinese
Pages (from-to)3028-3037
Number of pages10
JournalChinese Journal of Geophysics
Volume57
Issue number9
DOIs
Publication statusPublished - 1 Sep 2014
Externally publishedYes

Keywords

  • Finite fault
  • Ludian earthquake
  • Regional broadband data
  • Rupture process

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