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<p>Based on the earthquake catalog and waveform data recorded by Yunnan Seismic Networks (YSN) within one year before And after the 2018 Tonghai <i>M</i>s5.0 earthquake sequence, we obtain locations of a total of 667 template events by simultaneously using double-difference earthquake locating method And waveform cross-correlation Analysis. Using the relocated events as templates, an earthquake catalog containing 2851 earthquakes within a two-year timescale in the Tonghai earthquake source area was obtained based on the Match and Location method. The number of earthquakes in the new catalog was approximately five times that of the template events and three times that of the events in the YSN catalog. We conduct analyses of the spatiotemporal characteristics of seismic activity in the Tonghai area for two catalogs. Moreover, the cascading model may dominate the nucleation process of the <i>M</i>s5.0 mainshock due to the absence of aseismic slip and fluid diffusion in the source area before the mainshock. Comprehensive analyses of the aftershock distribution, decay rate, and the type of earthquake sequence inferred that the seismogenic structure of this earthquake is a relatively simple and geometrically straightforward secondary fault in the western branch of the southern segment of the Xiaojiang Fault Zone.</p>

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Seismicity in the Source Area of the 2018 Tonghai Ms5.0 Earthquake in Yunnan, China, and its Nucleation Mechanism

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Jinzhong Jiang,
  • Jiao Li,
  • Yan Zhang,
  • Guangming Wang,
  • Shuai Zhang,
  • Yuan Yao,
  • Dingchang Zheng,
  • Huidong Gu

摘要

Based on the earthquake catalog and waveform data recorded by Yunnan Seismic Networks (YSN) within one year before And after the 2018 Tonghai Ms5.0 earthquake sequence, we obtain locations of a total of 667 template events by simultaneously using double-difference earthquake locating method And waveform cross-correlation Analysis. Using the relocated events as templates, an earthquake catalog containing 2851 earthquakes within a two-year timescale in the Tonghai earthquake source area was obtained based on the Match and Location method. The number of earthquakes in the new catalog was approximately five times that of the template events and three times that of the events in the YSN catalog. We conduct analyses of the spatiotemporal characteristics of seismic activity in the Tonghai area for two catalogs. Moreover, the cascading model may dominate the nucleation process of the Ms5.0 mainshock due to the absence of aseismic slip and fluid diffusion in the source area before the mainshock. Comprehensive analyses of the aftershock distribution, decay rate, and the type of earthquake sequence inferred that the seismogenic structure of this earthquake is a relatively simple and geometrically straightforward secondary fault in the western branch of the southern segment of the Xiaojiang Fault Zone.