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Journal of Seismology

, Volume 22, Issue 3, pp 805–814 | Cite as

Joint inversion of GNSS and teleseismic data for the rupture process of the 2017 Mw6.5 Jiuzhaigou, China, earthquake

  • Qi Li
  • Kai Tan
  • Dong Zhen Wang
  • Bin Zhao
  • Rui Zhang
  • Yu Li
  • Yu Jie Qi
Original Article
  • 188 Downloads

Abstract

The spatio-temporal slip distribution of the earthquake that occurred on 8 August 2017 in Jiuzhaigou, China, was estimated from the teleseismic body wave and near-field Global Navigation Satellite System (GNSS) data (coseismic displacements and high-rate GPS data) based on a finite fault model. Compared with the inversion results from the teleseismic body waves, the near-field GNSS data can better restrain the rupture area, the maximum slip, the source time function, and the surface rupture. The results show that the maximum slip of the earthquake approaches 1.4 m, the scalar seismic moment is ~ 8.0 × 1018 N·m (Mw ≈ 6.5), and the centroid depth is ~ 15 km. The slip is mainly driven by the left-lateral strike-slip and it is initially inferred that the seismogenic fault occurs in the south branch of the Tazang fault or an undetectable fault, a NW-trending left-lateral strike-slip fault, and belongs to one of the tail structures at the easternmost end of the eastern Kunlun fault zone. The earthquake rupture is mainly concentrated at depths of 5–15 km, which results in the complete rupture of the seismic gap left by the previous four earthquakes with magnitudes > 6.0 in 1973 and 1976. Therefore, the possibility of a strong aftershock on the Huya fault is low. The source duration is ~ 30 s and there are two major ruptures. The main rupture occurs in the first 10 s, 4 s after the earthquake; the second rupture peak arrives in ~ 17 s. In addition, the Coulomb stress study shows that the epicenter of the earthquake is located in the area where the static Coulomb stress change increased because of the 12 May 2017 Mw7.9 Wenchuan, China, earthquake. Therefore, the Wenchuan earthquake promoted the occurrence of the 8 August 2017 Jiuzhaigou earthquake.

Keywords

Jiuzhaigou earthquake GNSS Earthquake rupture process Earthquake hazard 

Notes

Acknowledgments

Most of the figures were plotted using the Generic Mapping Tools (GMT) open-source collection of computer software tools, which is developed and maintained by Paul Wessel and Walter H. F. Smith. We acknowledge helpful comments and suggestions provided by two anonymous reviewers which improved the content of this paper.

Funding information

This research was supported by the Director Foundation of Institute of Seismology, China Earthquake Administration (Grant Nos. IS201116013, IS201506220), and National Natural Science Foundation of China (Grant Nos. 40974012, 41304019).

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Qi Li
    • 1
  • Kai Tan
    • 1
  • Dong Zhen Wang
    • 1
  • Bin Zhao
    • 1
  • Rui Zhang
    • 2
  • Yu Li
    • 2
  • Yu Jie Qi
    • 1
  1. 1.Key Laboratory of Earthquake Geodesy, Institute of SeismologyChina Earthquake AdministrationWuhanChina
  2. 2.National Earthquake Infrastructure ServiceChina Earthquake AdministrationBeijingChina

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