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Jiang Z Q，Yang Y H，Chen Q，Xu Q，Xu L，Huang X M. 2022. Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake. Acta Seismologica Sinica，44（3）：452−466. DOI: 10.11939/jass.20200140
Citation: Jiang Z Q，Yang Y H，Chen Q，Xu Q，Xu L，Huang X M. 2022. Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake. Acta Seismologica Sinica，44（3）：452−466. DOI: 10.11939/jass.20200140
shu

Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake

  • 1.

    Faculty of Geosciences and Environmental Engineering，Southwest Jiaotong University，Chengdu 611756，China

  • 2.

    State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu 610059，China

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  • Received Date: August 17, 2020
  • Revised Date: December 14, 2020
  • Available Online: December 05, 2021
  • Published Date: June 26, 2022
    Graphical Abstract
    • Abstract
  • In this study, a set of radar images acquired by the Sentinel-1 satellite that covers the interested seismically-effected area were collected. The time-series surface deformation of the 283-day time span after the 2017 Sarpol Zahab, Iran, MW7.3 earthquake was extracted by using small baseline subset technique, then the two-step procedure inversion is carried out to obtain the afterslip distribution. In order to analyze the triggering effects of the 2017 strong earthquake and its post-seismic faulting on the 2018 Javanrud MW6.0 earthquake, the coseismic deformation field covering the whole MW6.0 earthquake region was obtained by using differential interferometry technique, and the inversion results of seismogenic fault parameters were used as receiving fault parameters for stress calculation. The results show that the post-seismic deformation of the Sarpol Zahab earthquake is mainly dominated by the afterslip effect. 283 days after the earthquake, the accumulative slip of the after-slip model reaches up to 0.7 m. The coseismic source model of the Javanrud MW6.0 earthquake indicates that the seismogenic fault strike is 355.6°, the dip angle is 89.4°, and the rupture of coseismic fault is characterized by the right-lateral strike-slip together with some normal dip-slip component. Moreover, the calculated Coulomb stress change suggests that the MW7.3 earthquake and its afterslip have triggering effect on the subsequent Javanrud MW6.0 earthquake, and the occurrence of Javanrud earthquake could also be contributed by the regional plate activity.
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