Present-day fault kinematic around the eastern Himalayan Syntaxis and probable viscoelastic relaxation perturbation following the 1950 Mw 8.7 Assam earthquake

Li, Shuiping; Tao, Tingye; Gao, Fei; Qu, Xiaochuan; Zhu, Yongchao; Huang, Jianwei

doi:10.1016/j.jseaes.2022.105396

Cited by 2 publications

(1 citation statement)

References 89 publications

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“…c is a scalar offset between the observed velocity and model prediction corresponding to a choice of reference frame. We estimated the best-fit values for three model parameters (V s , D, and c) using a Bayesian Markov Chain Monte Carlo (MCMC) sampler [47][48][49]. The random walks of a given number of walkers are adopted by the Bayesian method to obtain the posterior probability distribution of the parameters based upon known prior constraints.…”

Section: D Velocity Field and Modeling Approachmentioning

confidence: 99%

Source Model of the 2023 Turkey Earthquake Sequence Imaged by Sentinel-1 and GPS Measurements: Implications for Heterogeneous Fault Behavior along the East Anatolian Fault Zone

Li,

Wang,

Tao

et al. 2023

Remote Sensing

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On 6 February 2023, a devastating doublet of earthquakes with magnitudes of Mw 7.8 and Mw 7.6 successively struck southeastern Turkey near the border of Syria. The earthquake sequence represents the strongest earthquakes in Turkey during the past 80 years and caused an extensive loss of life and property. In this study, we processed Sentinel-1 and GPS data to derive the complete surface displacement caused by the earthquake sequence. The surface displacements were adopted to invert for the fault geometry and coseismic slip distribution on the seismogenic faults of the earthquake sequence. The results indicate that the coseismic rupture of the Turkey earthquake sequence was dominated by left-lateral strike slips with a maximum slip of ~10 m on the East Anatolian Fault Zone (EAFZ) and the Sürgü fault (SF). Significant surface ruptures are recognized based on the geodetic inversion, which is consistent with the analysis of post-earthquake satellite images. The cumulative released moment of the two earthquakes reached 9.62 × 1020 Nm, which corresponds to an event of Mw 7.95. Additionally, the interseismic fault slip rates and locking depths along the central and western segments of the EAFZ were estimated using the high-resolution long-term velocity field. The results reveal significant lateral variations of fault slip rates and locking depths along the central and western segments of the EAFZ. Generally, the estimated fault locking zone showed good spatial consistency with the coseismic fault rupture of the Mw 7.8 shock on the EAFZ. The static coulomb failure stress (CFS) change due to the Mw 7.8 earthquakes suggests that the subsequent Mw 7.6 event was certainly promoted by the Mw 7.8 shock. The stress transfers from the fault EAFZ to the fault SF were realized by unclamping the interface of the fault SF, which significantly reduces the effective normal stress on the fault plane. Large CFS increases in the western Puturge segment of the EAFZ, which was not ruptured in the 2020 Mw 6.8 and the 2023 Mw 7.8 earthquakes, highlight the future earthquake risk in this fault segment.

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Section: D Velocity Field and Modeling Approachmentioning

confidence: 99%

Source Model of the 2023 Turkey Earthquake Sequence Imaged by Sentinel-1 and GPS Measurements: Implications for Heterogeneous Fault Behavior along the East Anatolian Fault Zone

Li,

Wang,

Tao

et al. 2023

Remote Sensing

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Indian Crustal Front beneath Tibet Inferred from Seismic Anisotropy

Zhang,

Bao,

et al. 2024

Seismological Research Letters

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Postcollisional downgoing of the Indian plate has absorbed large amounts of the Cenozoic India–Asia convergence and is a key process governing the Tibetan Plateau’s evolution and growth; however, to date, whether the Indian slab is currently subducting or underthrusting is still controversial. Here, we present new constraints on the nature of seismic anisotropy within the crust of the eastern Lhasa terrane and the adjacent areas by exploiting the splitting phenomenon of P-to-S converted phases from the Moho. A crustal seismic anisotropy dataset in the main collisional belt of Tibet is then assembled by incorporating the newly obtained and published measurements. Our results highlight the systematic changes in preferred orientation of deep-crust anisotropic minerals along the perpendicular direction of the Himalayan arc, with a sharp northward transition from convergence-parallel to orogen-parallel directions occurring at ∼450 to 500 km north of the Main Frontal thrust. The latter observation provides an estimate of the northern frontier of the Indian lower crust from the perspective of seismic anisotropy and indicates overall and long-distance underthrusting of the Indian plate under Tibet.

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Present-day fault kinematic around the eastern Himalayan Syntaxis and probable viscoelastic relaxation perturbation following the 1950 Mw 8.7 Assam earthquake

Cited by 2 publications

References 89 publications

Source Model of the 2023 Turkey Earthquake Sequence Imaged by Sentinel-1 and GPS Measurements: Implications for Heterogeneous Fault Behavior along the East Anatolian Fault Zone

Source Model of the 2023 Turkey Earthquake Sequence Imaged by Sentinel-1 and GPS Measurements: Implications for Heterogeneous Fault Behavior along the East Anatolian Fault Zone

Indian Crustal Front beneath Tibet Inferred from Seismic Anisotropy

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