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Seismicity Analysis of the 2016 Ms5.0 Yunlong Earthquake, Yunnan, China and Its Tectonic Implications

  • Jinzhong Jiang
  • Jiao Li
  • Hong Fu
Article
  • 31 Downloads

Abstract

We relocate earthquakes occurring 1 week before and 1 month after the 2016 Yunlong Ms5.0 earthquake by simultaneously using P (and S) travel times and waveform cross-correlation data in the double-difference relocation algorithm. We then use the well-relocated earthquakes as template events and scan through the continuous waveforms to search for and locate weak events by using the match and locate method. A total of 4602 events are detected by using 660 templates, which is ~ 3 times the number of events listed in the Yunnan Seismic Networks catalogue. Our refined catalogue reveals three stages of seismic activity and energy release processes during the 2016 Yunlong Ms5.0 earthquake sequence. We also refine the focal depths and mechanisms of 12M ≥ 3.0 earthquakes using the broadband waveform modeling method. Both the relocated hypocenters and focal mechanisms of the 12M ≥ 3.0 earthquakes delineate fault strike and dip angles of ~ 200° and ~ 75°, respectively, indicating that the seismogenic fault could be a NNE-striking blind or subfault located between the Weixi-Qiaohou Fault and Lancangjiang Fault. Our results could contribute to better understanding of local seismic hazard evaluations in the vicinity of Yunlong area of Yunnan, China.

Notes

Acknowledgements

This research was supported by the Earthquake Scientific Research of Yunnan Earthquake Agency (grants 201601, 2018ZX01, and C3-201706). Seismic waveform and catalogue data were obtained from Yunnan Seismic Networks. We are grateful to Dr. Miao Zhang for providing the M&L program package, as well as Professor Xinlin Lei for teaching and discussing in the ETAS analysis module. Seismic Analysis Code (SAC) and Generic Mapping Tools (GMT) were used for basic data processing and figure development. We thank Dr. Xin Wang for help in paper writing and revision. We also thank the editor, Dr. Haijiang Zhang, and two anonymous reviewers for constructive comments and suggestions that significantly improved the quality of this paper.

Supplementary material

24_2018_2067_MOESM1_ESM.docx (4.4 mb)
Supplementary material 1 (DOCX 4467 kb)

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Yunnan Earthquake AgencyKunmingChina

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