Source characteristics of the mainshock and aftershocks of the 2019 Changning earthquake sequence: Implications for fluid effects

Dai, Kun; Zheng, Yong; Guo, Rumeng; Xu, Jun

doi:10.1007/s11430-022-1040-4

Cited by 4 publications

(1 citation statement)

References 64 publications

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“…Studies on the seismicity migration (Lei et al., 2020; Meng et al., 2018), focal mechanism (Chu & Sheng, 2023; Dai et al., 2023; Liu & Zahradník, 2020; Sheng et al., 2020; Yi et al., 2020), Coulomb stress changes (Lei et al., 2017), finite fault models (S. Wang et al., 2022), statistical analysis (e.g., b ‐values and ETAS models, etc.) (Sheng et al., 2022; Tan et al., 2023), and numerical simulation (H. Yang et al., 2024; Y. Yang et al., 2023) in southern Sichuan suggested that industrial activities could alter the subsurface fluid state, affect the local crustal stress, accelerate the fracturing of tectonic formations, and finally induce earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Seismological Evidence for the Existence of Long‐Distance Hydrological Channel and Its Implication for Fluid Overpressure in Southern Sichuan, China

Tian,

Wu,

Dai

et al. 2024

Geophysical Research Letters

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Unprecedented levels of seismicity have been seen in southern Sichuan, China, since the large‐scale exploitation of shale gas. Fluid and pore pressure transported through hydrological channel are thought as pivotal elements in the induction of earthquakes. Our high‐resolution tomography results reveal two inclined seismic anomalies featured by low Vs and high Vp/Vs at different depth range. The deeper anomaly extends 15 km from NE to SE and connects the well g048 from 3 km depth to the vicinity of the Ms 4.7 Gongxian earthquake 5.4 km deep, which is hinted to be a hydrological channel inferred from the high fluid overpressure of 28 Mpa calculated from focal mechanism solution. The injection operation of multiple shale gas wells along the channel may potentially accumulate the pore pressure and cause the fault near the end of the channel to reach critical stress state through various mechanisms.

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Section: Introductionmentioning

confidence: 99%

Seismological Evidence for the Existence of Long‐Distance Hydrological Channel and Its Implication for Fluid Overpressure in Southern Sichuan, China

Tian,

Wu,

Dai

et al. 2024

Geophysical Research Letters

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Induced seismicity in the Changning salt mining zone, China, could be driven by the pore-pressure diffusion

Yang,

Guo,

Zhai

et al. 2024

Tectonophysics

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The Source Characteristics of the 2022 Ms 6.1 Lushan Earthquake: An Event That Occurred on the Conjugated Fault of the 2013 Ms 7.0 Lushan Earthquake

Dai¹,

Guo²,

Zou

et al. 2023

Seismological Research Letters

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The 2022 Ms 6.1 Lushan earthquake occurred in the southern segment of the Longmenshan fold-and-thrust belt, Sichuan Province, China, ∼7 km north-northwest of the 2013 Ms 7.0 Lushan earthquake. To understand its source characteristics and interplay with the 2013 Lushan event, we evaluate the 2022 Lushan earthquake in terms of focal mechanism, aftershock relocation, and rupture process. Results show that it is a purely thrust earthquake with a source depth of 14 km and a focal mechanism nodal plane of 29°/51°/80°. The automatic phase picker-based aftershock locus clarifies that the 2022 Lushan earthquake occurred on a blind northeast-trending conjugate fault of the 2013 Lushan earthquake. The finite-fault model constrained by teleseismic waveforms suggests that the high slip is concentrated in an asperity near the epicenter with a peak slip of 42 cm, which is characterized by thrust components. Based on the promotion of postseismic deformation following the 2013 Lushan earthquake and the similarity of the seismotectonic system, we argue that the 2022 Lushan earthquake may be an aftershock of the 2013 Lushan earthquake that occurred on a blind thrust fault.

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Source characteristics of the mainshock and aftershocks of the 2019 Changning earthquake sequence: Implications for fluid effects

Cited by 4 publications

References 64 publications

Seismological Evidence for the Existence of Long‐Distance Hydrological Channel and Its Implication for Fluid Overpressure in Southern Sichuan, China

Seismological Evidence for the Existence of Long‐Distance Hydrological Channel and Its Implication for Fluid Overpressure in Southern Sichuan, China

Induced seismicity in the Changning salt mining zone, China, could be driven by the pore-pressure diffusion

The Source Characteristics of the 2022 Ms 6.1 Lushan Earthquake: An Event That Occurred on the Conjugated Fault of the 2013 Ms 7.0 Lushan Earthquake

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