Relocation of the mainshock and aftershock sequences of MS7.0 Sichuan Lushan earthquakeReport as inadecuate

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Chinese Science Bulletin

, Volume 58, Issue 28–29, pp 3451–3459

First Online: 27 July 2013Received: 07 June 2013Accepted: 24 June 2013DOI: 10.1007-s11434-013-6000-2

Cite this article as: Fang, L., Wu, J., Wang, W. et al. Chin. Sci. Bull. 2013 58: 3451. doi:10.1007-s11434-013-6000-2


The mainshock of April 20, 2013 Sichuan Lushan MS7.0 earthquake was relocated using a 3-D velocity model. Double difference algorithm was applied to relocate aftershock sequences of Lushan earthquake. The locations of 2405 aftershocks were determined. The location errors in E-W, N-S and U-D direction were 0.30, 0.29 and 0.59 km on average, respectively. The location of the mainshock is 102.983°E, 30.291°N and the focal depth is 17.6 km. The relocation results show that the aftershocks spread approximately 35 km in length and 16 km in width. The dominant distribution of the focal depth ranges from 10 to 20 km. A few earthquakes occurred in the shallow crust. Focal depth profiles show fault planes dip to the northwest, manifested itself as a listric thrust fault. The dip angle is steep in the shallow crust and gentle in the deep crust. Although the epicenters of aftershocks distributed mainly along both sides of the Shuangshi-Dachuan fault, the seismogenic fault may be a blind thrust fault on the eastern side of the Shuangshi-Dachuan fault. Earthquake relocation results reveal that there is a southeastward tilt aftershock belt intersecting with the seismogenic fault with y-shape. We speculate it is a back thrust fault that often appears in a thrust fault system. Lushan earthquake triggered the seismic activity of the back thrust fault.

KeywordsLushan earthquake aftershock sequence earthquake location double difference location Longmenshan fault This article is published with open access at

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Author: LiHua Fang - JianPing Wu - WeiLai Wang - ZuoYong Lü - ChangZai Wang - Ting Yang - Yan Cai


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