| Citation: |
ZHAO Lei, XU WenBin, FANG Nan, LIU JiHong, FENG GuangCai. 2023. Coseismic and early postseismic fault slip model and the seismogenic fault friction properties of the 2021 Qinghai Madoi MW7.3 earthquake. Chinese Journal of Geophysics (in Chinese), 66(3): 1086-1097, doi: 10.6038/cjg2022Q0189
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Coseismic and early postseismic fault slip model and the seismogenic fault friction properties of the 2021 Qinghai Madoi MW7.3 earthquake
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Abstract
Coseismic slip and early post-earthquake afterslip are important ways to observe seismogenic morphology and friction properties of seismogenic faults. We use InSAR data to obtain the coseismic and early postseismic deformation and estimate the fault slip distribution model. The coseismic slip is mainly distributed in the shallow upper crust and shows several shallow slip deficits. The dip in the eastern branches fault is opposite to the western and main segment. We process 4.5 months postseismic deformation based on the N-SBAS method, which accumulates~5 cm displacement in near-field and ~2 cm in far-field. The afterslip distributed in both updip and downdip areas and laterally extended alongside western and eastern ends. The shallow upper crust afterslip fills the shallow slip deficit, and several areas overlap the coseismic slip. The maximum afterslip is ~20 cm in the updip region. The temporal-spatial moment shows rapid afterslip in the shallow upper crust and stable afterslip in the downdip area, which indicates the complex friction properties of the seismogenic fault.
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Keywords:
- Fault model /
- Afterslip distribution /
- Postseismic deformation /
- Friction property
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ZHAO Lei, XU WenBin, FANG Nan, LIU JiHong, FENG GuangCai. 2023. Coseismic and early postseismic fault slip model and the seismogenic fault friction properties of the 2021 Qinghai Madoi MW7.3 earthquake. Chinese Journal of Geophysics (in Chinese), 66(3): 1086-1097, doi: 10.6038/cjg2022Q0189
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Figure 1.
Regional tectonic setting
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Figure 2.
1-D and 2-D posterior probability density distribution plots of the fault geometry parameters
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Figure 3.
The coseismic and postseismic deformation of the Madoi earthquake
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Figure 4.
Time-series of postseismic deformation after the 2021 Madoi earthquake in Sentinel-1 descending orbit
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Figure 5.
Time-series of postseismic deformation after the 2021 Madoi earthquake in Sentinel-1 ascending orbit
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Figure 6.
(a) The optimal dip angle of Seg.1, the cyan star represents the optimal value; (b) The optimal dip angle of Seg.3; (c) The optimal dip angle of Seg.4; (d) The optimal dip angle of jointly inversion of Seg.3 and Seg.4; (e) Coseismic slip distribution of the Madoi earthquake; (f) Postseismic slip distribution of the Madoi earthquake, the blue dots represent the aftershocks, the colored lines represent the rupture surface trace, the red star represents the epicenter
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Figure 7.
Coseismic deformation field of the Madoi earthquake
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Figure 8.
Model coseismic slip parameter uncertainties, the colored lines represent the rupture surface trace, the red star represents the epicenter; (b) Model early afterslip parameter uncertainties; (c) Coseismic static Coulomb stress change; (d) The calculated rate and state friction parameter a-b of the seismogenic fault
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Figure 9.
Postseismic deformation field of the Madoi earthquake
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Figure 10.
The normalized accumulated seismic moment of coseismic, early afterslip and aftershocks with depth; (b) Temporal evolution of early afterslip seismic moment with depth