Effect of real-world frictional strengthening layer near the Earth's free surface on rupture characteristics with different friction laws: Implication for scarcity of supershear earthquakes

Cui, Zefei; Zhu, Shoubiao

doi:10.1016/j.tecto.2022.229447

Cited by 3 publications

(1 citation statement)

References 120 publications

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“…The large surface slip in some fault segments of the kinematic inversion results indicate that lateral variations in friction condition may exist at the shallow part of the fault, some fault segments may exhibit weak velocity-strengthening behavior (the value of the constitutive parameter (a-b) in the velocity-weakening friction law is small) or even behave as velocity-weakening. Such fault segments enable the supershear transition and lead to sustained supershear propagation (Cui & Zhu, 2022). Thus, the daughter crack can generate at the first asperity in the eastern segment due to the stress concentrations and sustainedly propagate on fault.…”

Section: Possible Mechanism Of Supershear Rupturementioning

confidence: 99%

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Wen,

Cai,

et al. 2024

JGR Solid Earth

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The 2021 MW 7.4 Maduo event occurred within the Bayan Har block in eastern Tibet, which provides an opportunity to investigate the stress conditions and rheology of faults within the block. Here, we perform dynamic rupture simulations based on the finite element method to explore the physical conditions underlying this earthquake and the factors that controlled the rupture process. We construct the model with a nonplanar fault inferred from the Interferometric Synthetic Aperture Radar (InSAR) data and aftershocks sequence relocation. Our dynamic model is controlled by slip‐weakening friction law with initial stress on fault resolved from a uniform regional stress field. The preferred model produces an average slip of ∼2.2 m with a maximum slip of ∼4.0 m. There are three asperities distributed along the strike, which have captured the main features of the Maduo event. The simulation results are consistent with the static GPS coseismic surface displacements, InSAR data, and displacement waveforms recorded by high‐rate GNSS stations. By comparing the results with the planar fault model and rotated stress fields, we find that the fault geometry and regional stress field are the primary factors that control the rupture process of the event. Moreover, we infer that the unfavorable orientation and fault bend lead to minor slips on the branch fault. Furthermore, we investigate the potential mechanisms of supershear rupture on the eastern fault segment.

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Section: Possible Mechanism Of Supershear Rupturementioning

confidence: 99%

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Wen,

Cai,

et al. 2024

JGR Solid Earth

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Contemporary crustal strain rates derived from GPS measurements in southwestern China

Zhu

2025

Journal of Asian Earth Sciences

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Present-day crustal deformation based on GPS measurements in southeastern Tibetan Plateau: implications for geodynamics and earthquake hazard

Zhu

2023

Geomatics, Natural Hazards and Risk

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Effect of real-world frictional strengthening layer near the Earth's free surface on rupture characteristics with different friction laws: Implication for scarcity of supershear earthquakes

Cited by 3 publications

References 120 publications

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Contemporary crustal strain rates derived from GPS measurements in southwestern China

Present-day crustal deformation based on GPS measurements in southeastern Tibetan Plateau: implications for geodynamics and earthquake hazard

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Effect of real-world frictional strengthening layer near the Earth's free surface on rupture characteristics with different friction laws: Implication for scarcity of supershear earthquakes

Cited by 3 publications

References 120 publications

Dynamic Rupture of the 2021 MW 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Dynamic Rupture of the 2021 MW 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Contemporary crustal strain rates derived from GPS measurements in southwestern China

Present-day crustal deformation based on GPS measurements in southeastern Tibetan Plateau: implications for geodynamics and earthquake hazard

Contact Info

Product

Resources

About

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry

Dynamic Rupture of the 2021 M_W 7.4 Maduo Earthquake: An Intra‐Block Event Controlled by Fault Geometry