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Han Jiadong, Yang Jiansi, Wang Weiping. 2019: Relocation of the aftershock sequence of Milin MS6.9 earthquake in 2007 and spatio-temporal variation characteristics of b-value. Acta Seismologica Sinica, 41(2): 169-180. DOI: 10.11939/jass.20180077
Citation: Han Jiadong, Yang Jiansi, Wang Weiping. 2019: Relocation of the aftershock sequence of Milin MS6.9 earthquake in 2007 and spatio-temporal variation characteristics of b-value. Acta Seismologica Sinica, 41(2): 169-180. DOI: 10.11939/jass.20180077
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Relocation of the aftershock sequence of Milin MS6.9 earthquake in 2007 and spatio-temporal variation characteristics of b-value

  • Institute of Geophysics， China Earthquake Administration， Beijing 100081， China

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  • Received Date: June 05, 2018
  • Revised Date: September 13, 2018
  • Available Online: February 24, 2019
  • Published Date: February 28, 2019
    Graphical Abstract
    • Abstract
  • The aftershock sequence of the Milin MS6.9 earthquake in Tibet in 2017 are relocated by double-difference algorithm in this paper. Based on the relocated results, the spatial distribution of b-value in the source region of Milin earthquake is obtained. Combining historical b-value data from previous researches, the temporal distribution of b-value in the studied area is also obtained. The relocation results show that the aftershock sequence of the Milin earthquake are distributed in NE−SE direction along the NE boundary of Indus-Yarlung Tsangpo big-turned suture and Bilu tectonic slice, most aftershocks are concentrated in 3−20 km depth. The temporal distribution of b-value shows before Milin earthquake b-value is lower than that in the year of 2008, indicating that the stress accumulation in the studied area is strong before Milin earthquake. After Milin earthquake, there was a step-rise of b-value, showing the releases of stress, and b-value tended to stable. b-value ranges in 0.52−1.35 in the source region of Milin earthquake, the b-value variation above the depth of 15 km is distributed along the east-west direction, and below 15 km along the NE−SW direction. Therefore, it is deduced that different b-value distribution represents different structure characteristics, i.e., the b-value variation of the shallow area is related to the degree of rupture in the source region, and the b-value variation of deep area reflects the lithology difference of different tectonic units.
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