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Zhu Y J，Luo Y，Zhao L. 2023. Rupture process of the January 2022 Menyuan，Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms. Acta Seismologica Sinica，45（3）：1−15 doi: 10.11939/jass.20220148
Citation: Zhu Y J，Luo Y，Zhao L. 2023. Rupture process of the January 2022 Menyuan，Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms. Acta Seismologica Sinica，45（3）：1−15 doi: 10.11939/jass.20220148
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Rupture process of the January 2022 Menyuan，Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms

doi: 10.11939/jass.20220148
  • 1.

    Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards，Hebei Xingtai 054000，China

  • 2.

    Key laboratory of Earthquake Prediction，Institute of Earthquake Forecasting，China Earthquake Administration，Beijing 100036，China

  • 3.

    School of Earth and Space Sciences，Peking University，Beijing 100871，China

  • 4.

    Hebei Earthquake Agency，Shijiazhuang 050021，China

  • 5.

    School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230000，China

  • Received Date: 2022-08-16
  • Rev Recd Date: 2022-09-28
    • Available Online: 2022-09-30
    Abstract
  • Based on regional broadband waveform records, we investigate the rupture process of the January 2022 Menyuan MS6.9 earthquake by using the finite fault inversion method, and then combined with the geological knowledge and aftershock relocation results to determine the actual rupture fault., The inversion results show that the Menyuan earthquake occurred on a WNW-trending strike-slip fault. The rupture mainly occurred on both sides of the hypocenter, with a bilateral rupture characteristic. The maximum ruptures on the two sides of the hypocenter occurred at 2 s and 9 s. In terms of rupture scale, the depth of obvious rupture and the length of surface rupture are about 16 km and 20 km, and the maximum slip of 1.5 m occurs at about 6km. The seismic energy is mainly released in the first 15 s. The total seismic moment released is 1.23×1019 N·m, equivalent to MW6.67. The dip angle of the seismogenic fault plane is 84.6°, almost vertical. Due to the large range of rupture, the surface projection of obvious rupture is up to 34 km.

     

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