Geometric Control on Seismic Rupture and Earthquake Sequence Along the Yingxiu‐Beichuan Fault With Implications for the 2008 Wenchuan Earthquake

Zhang, Lei; Liu, Yajing; He, Changrong; Yu, Hongyu; He, Chuansong

doi:10.1029/2022jb024113

Cited by 6 publications

(1 citation statement)

References 101 publications

(228 reference statements)

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“…(2022) found that fault geometry controlled the rupture propagation of the 2020 Jiashi earthquake. Furthermore, the earthquake cycle simulations also recognized the impact of geometric factors on rupture behaviors (Yu et al., 2018; Zhang et al., 2022b). Therefore, in addition to stress and frictional heterogeneities, fault geometry may also play a important role in the complexity of rupture behavior.…”

Section: Introductionmentioning

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: Introductionmentioning

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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High-resolution seismicity imaging and early aftershock migration of the 2023 Kahramanmaraş (SE Türkiye) MW7.9 & 7.8 earthquake doublet

Ding,

Zhou,

et al. 2023

Earthquake Science

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Earthquake Nucleation and Slip Behavior Altered by Stochastic Normal Stress Heterogeneity

Li,

Niemeijer,

van Dinther

2024

JGR Solid Earth

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In recent laboratory experiments, varying nucleation locations of accelerating slip with changing nucleation lengths were observed. Spatial variations in effective normal stress, due to the controlling influence on fault strength and fracture energy, play an important role. We quantitatively explain how spatially heterogeneous effective normal stresses affect earthquake nucleation and slip behavior. We simulate a meter‐scale laboratory experiment in a numerical earthquake sequence model with stochastically variable normal stresses. We identify five regimes of earthquake nucleation and slip behaviors, controlled by the ratio of the heterogeneity wavelength to the nucleation length . When , full ruptures are observed. Slip rates and recurrence intervals are similar to those on homogeneous faults with comparable averaged normal stress. When , slow slip events and partial ruptures occur frequently and the nucleation length of each earthquake depends on the local stress level. We find locations of nucleation and arrest in both low and high normal stress regions (LSR and HSR, respectively) when and are of the same magnitude. When , earthquakes nucleate in LSRs, and arrest in HSRs. However, HSRs and LSRs switch these roles when . Interestingly, we observe that nucleation migrates from an LSR to its neighboring HSR in one earthquake, when is between the minimum and maximum local nucleation lengths. We observe a large amount of aseismic slip and associated stress drop in the initial LSR, which might be linked to the migration of foreshocks as documented in natural and laboratory observations. This improved understanding of earthquake nucleation is important in estimating the seismic potential of different fault patches for natural and induced seismicity.

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Geometric Control on Seismic Rupture and Earthquake Sequence Along the Yingxiu‐Beichuan Fault With Implications for the 2008 Wenchuan Earthquake

Cited by 6 publications

References 101 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

High-resolution seismicity imaging and early aftershock migration of the 2023 Kahramanmaraş (SE Türkiye) MW7.9 & 7.8 earthquake doublet

Earthquake Nucleation and Slip Behavior Altered by Stochastic Normal Stress Heterogeneity

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Geometric Control on Seismic Rupture and Earthquake Sequence Along the Yingxiu‐Beichuan Fault With Implications for the 2008 Wenchuan Earthquake

Cited by 6 publications

References 101 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

High-resolution seismicity imaging and early aftershock migration of the 2023 Kahramanmaraş (SE Türkiye) MW7.9 & 7.8 earthquake doublet

Earthquake Nucleation and Slip Behavior Altered by Stochastic Normal Stress Heterogeneity

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