Complex strike-slip faulting during the 2021 Mw7.4 Maduo earthquake

Wei, Guoguang; Chen, Kejie; Lyu, Mingzhe; Gong, Wenzheng; Dal Zilio, Luca; Ye, Lingling; Tu, Hongwei

doi:10.1038/s43247-023-00980-6

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…Inversions of geodetically ground displacements are exclusively capable of determining the most plausible fault geometry at depth (Bagnardi & Hooper, 2018; Wei, Chen, Lyu, et al, 2023; Wei, Chen, & Meng, 2023). In this study, the seismogenic fault geometry is estimated through a fully Bayesian inversion of the co‐seismic ground displacements, informed by the interferometric synthetic aperture radar (InSAR) approach.…”

Section: Introductionmentioning

confidence: 99%

The 2023 Mw 6.8 Morocco Earthquake: A Lower Crust Event Triggered by Mantle Upwelling?

Huang,

Wei,

Chen

et al. 2024

Geophysical Research Letters

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A M6.8 earthquake struck the High Atlas Mountains in Morocco on 8 September 2023, ending a 63‐year seismic silence. We herein attempt to clarify the seismogenic fault and explore the underlying mechanism for this seismic event based on multiple data sets. Utilizing probabilistic Bayesian inversion on interferometric radar data, we determine a seismogenic fault plane centered at a depth of 26 km, striking 251° and dipping 72°, closely aligned with the Tizi n’Test fault system. Given a hypocenter at the Moho depth, the joint inversion of radar and teleseismic data reveals that the rupture concentrates between depths of 12 and 36 km, offsetting the Mohorovičić discontinuity (Moho) at ∼32 km. Considering a strong link between magma activity and failure in lower crust, we propose that the triggering of the earthquake possibly was mantle upwelling that also supports the high topography.

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Section: Introductionmentioning

confidence: 99%

The 2023 Mw 6.8 Morocco Earthquake: A Lower Crust Event Triggered by Mantle Upwelling?

Huang,

Wei,

Chen

et al. 2024

Geophysical Research Letters

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Source parameter inversion of the 2021 MW7.4 Maduo earthquake and stress transfer in the eastern Bayan Har block

Wang,

Xu,

Zhang

et al. 2024

Advances in Space Research

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A simple weighting method for inverting earthquake source parameters using geodetic multisource data under Bayesian algorithm

Xi,

Wang,

Zhao

et al. 2024

Geophysical Journal International

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Summary More accurate inversion of source fault geometry and slip parameters under the constraint of the Bayesian algorithm has become a research hotspot in the field of geodetic inversion in recent years. In nonlinear inversion, the determination of the weight ratio of the joint inversion of multi-source data is more complicated. In this context, this paper proposes a simple and easily generalized weighting method for inversion of source fault parameters by joint geodetic multi-source data under the Bayesian framework. This method determines the relative weight ratio of multi-source data by RMSE (Root Mean Square Error) value and can be extended to other nonlinear search algorithms. To verify the validity of the method in this paper, this paper first sets up four sets of simulated seismic experiment schemes. The inversion results show that the joint inversion weighting method proposed in this paper has a significant decrease in the large residual value compared with the equal weight joint inversion and the single data source joint inversion method. The east-west deformation RMSE is 0.1458 mm, the north-south deformation RMSE is 0.2119 mm, and the vertical deformation RMSE is 0.2756 mm. The RMSE of the three directions is lower than that of other schemes, indicating that the proposed method is suitable for the joint inversion of source parameters under Bayesian algorithm. To further verify the applicability of the proposed method in complex earthquakes, the source parameters of the Maduo earthquake were inverted using the method of this paper. The focal depth of the inversion results in this paper is closer to the focal depth released by the GCMT agency. In terms of strike angle and dip angle, the joint inversion in this paper is also more inclined to the GCMT results. The joint inversion results generally conform to the characteristics of left-lateral strike-slip, which shows the adaptability of this method in complex earthquakes.

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Complex strike-slip faulting during the 2021 Mw7.4 Maduo earthquake

Cited by 3 publications

References 57 publications

The 2023 Mw 6.8 Morocco Earthquake: A Lower Crust Event Triggered by Mantle Upwelling?

The 2023 Mw 6.8 Morocco Earthquake: A Lower Crust Event Triggered by Mantle Upwelling?

Source parameter inversion of the 2021 MW7.4 Maduo earthquake and stress transfer in the eastern Bayan Har block

A simple weighting method for inverting earthquake source parameters using geodetic multisource data under Bayesian algorithm

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