• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 29 Issue 6
Nov.  2016
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Article Contents
WANG Hongwei, WEN Ruizhi, REN Yefei, SONG Jindong. Rapid Rupture Direction Estimation of Kangding Earthquake Using Strong-Motion Recordings[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1138-1146. doi: 10.3969/j.issn.0258-2724.2016.06.013
Citation: WANG Hongwei, WEN Ruizhi, REN Yefei, SONG Jindong. Rapid Rupture Direction Estimation of Kangding Earthquake Using Strong-Motion Recordings[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1138-1146. doi: 10.3969/j.issn.0258-2724.2016.06.013

Rapid Rupture Direction Estimation of Kangding Earthquake Using Strong-Motion Recordings

doi: 10.3969/j.issn.0258-2724.2016.06.013
  • Received Date: 05 Apr 2015
  • Publish Date: 25 Dec 2016
  • An MS6.3 earthquake hit the Kangding County, Sichuan Province on November 22, 2014. Three days later, an MS5.8 aftershock occurred. The source rupture properties of two earthquakes were analyzed and the method for rapidly estimating the source rupture direction was investigated using strong-motion recordings. The grid-search technique was used to seek the optimal source rupture parameters, including the predominant rupture direction and the rupture velocity, which can satisfy the minimum fitting error between the predicted peak ground-motion parameters and the observed ones corrected by the directivity coefficient. The results indicate owing to lack of the strong-motion stations in the northwest of the MS6.3 earthquake epicenter, the non-uniform spatial distribution of the strong-motion recordings results in the bad estimation of the rupture direction. With strong-motion recordings from temporary strong-motion stations, the rupture parameters for the MS5.8 earthquake were well estimated. The MS5.8 earthquake predominantly ruptured in the N320oE direction, accounting for 70%-90% of the total rupture, which is consistent with the fault trend and the aftershock distribution. The rupture velocity of the MS5.8 earthquake is approximately 2.5-2.8 km/s.

     

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