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LI Zhicai, DING Kaihua, ZHANG Peng, WEN Yangmao, ZHAO Lijiang, CHEN Jianfeng. Coseismic Deformation and Slip Distribution of 2021 Mw 7.4 Madoi Earthquake from GNSS Observation[J]. Geomatics and Information Science of Wuhan University, 2021, 46(10): 1489-1497. DOI: 10.13203/j.whugis20210301
Citation: LI Zhicai, DING Kaihua, ZHANG Peng, WEN Yangmao, ZHAO Lijiang, CHEN Jianfeng. Coseismic Deformation and Slip Distribution of 2021 Mw 7.4 Madoi Earthquake from GNSS Observation[J]. Geomatics and Information Science of Wuhan University, 2021, 46(10): 1489-1497. DOI: 10.13203/j.whugis20210301
shu

Coseismic Deformation and Slip Distribution of 2021 Mw 7.4 Madoi Earthquake from GNSS Observation

  • 1.

    Geodesy Datum Department, National Geomatics Center of China, Beijing 100830, China

  • 2.

    School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China

  • 3.

    School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

  • 4.

    Qinghai Institute of Basic Surveying and Mapping, Xining 810001, China

  • 5.

    China Mobile Intelligent Mobility Network Co. Ltd, Shanghai 201206, China

Funds: 

The National Natural Science Foundation of China 41774011

The National Natural Science Foundation of China 41874011

The National Natural Science Foundation of China 41804038

the National Key Research and Development Program of China 2016YFB0501405

More Information
  • Author Bio:

    LI Zhicai, PhD,senior engineer, specializes in GNSS data processing and geodesy inversion. E-mail: zcli@ngcc.cn

  • Corresponding author:

    ZHANG Peng, PhD, senior engineer, E-mail: zhangpeng@ngcc.cn

  • Received Date: June 07, 2021
  • Published Date: October 04, 2021
    Graphical Abstract
    • Abstract
  •   Objectives  At 2:00 on May 22, 2020 (UTC+8), an Mw 7.4 earthquake struck Madoi County, Qinghai Province, China. The earthquake occurred in the unattended area of the Qinghai Tibet Plateau, with less injuries and building damage, but caused obvious surface rupture.
      Methods  9 high frequency continuously operating reference stations(CORS) data with 1 Hz sampling rate were collected near the epicenter, and the co-seismic deformation was derived from high frequency observation data with 1 hour before and after the earthquake based on precise point positioning with ambiguity resolution(PPP-AR). The low frequency data with 30 s sampling of 12 CORS around Madoi County were collected before and after the earthquake within 3 days to solve for the permeant co-seismic deformation based on the non-differential precise point positioning(PPP).
      Results  The comparison between these two kinds of co-seismic deformation illustrates that the co-seismic deformation from the high frequency (1 Hz) data is slightly smaller than that of the low frequency (30 s) data. The maximum observed global navigation satellite system(GNSS) co-seismic displacement is about 0.6 m.Further, the fault geometry and slip distribution of the earthquake were inverted based on the permanent co-seismic deformation.
      Conclusions  The inversion results indicate that the Madoi earthquake is a typical left-lateral strike slip event (rake angle: -10.90°), with a strike of 278.49°and dip angle of 64.38°. The rupture length is about 138.72 km. The slip distribution reveals that more than 3 m slip is mainly concentrated in the eastern asperity with the depth of less than 18 km with the maximum slip of 4.2 m. The geodetic seismic moment is about 1.85×1020 Nm, equivalent to Mw 7.45, which is slightly larger than the result of United States Geological Survey(USGS) from seismic waves.
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    • References (34)
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