Coupling fraction and relocking process of the Longmenshan Fault Zone following the 2008 Mw7.9 Wenchuan earthquake

Zhao, Jun; Ren, Jun; Liu, Jie; Jiang, Zhuoran; Liu, Xiaoxia; Liang, Hongbao; An-fu, Niu; Yue, Chong; Zhengyi, Yuan

doi:10.1016/j.jog.2020.101730

Cited by 26 publications

(20 citation statements)

References 39 publications

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“…3 (1) and S 2 , S 1 and S 2 ). The good correspondence between profiles AA' and DD' shows that the V s model can reflect the change of regional geology to a certain extent.…”

Section: Resultsmentioning

confidence: 98%

“…The detection of urban hidden faults is an essential work for city planning, construction and earthquake disaster reduction especially when urbanization is highly developed and any strong earthquake (e.g. the 2008 magnitude 7.9 Wenchuan earthquake and the 2010 magnitude 7.0 Haiti earthquake) happened in urban areas will cause immeasurable losses 1 – 3 . To study the structure of hidden faults, there are generally two methods, comprehensive active source experiments and passive seismic monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Detection of urban hidden faults using group-velocity ambient noise tomography beneath Zhenjiang area, China

Zheng

Fan

Zhang

et al. 2021

Sci Rep

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The Mufushan-Jiaoshan fault (MJF) is a hidden active fault located on the north side of the Ningzhen Mountain Range and developed along the Yangtze River in Zhenjiang area, China. In this paper, the structure of MJF is detected and studied using group-velocity ambient noise tomography. In the study area (18 km × 25 km), 47 short-period seismic stations were deployed with the average station spacing of about 3 km and 24 days (from 27 February to 22 March 2019) of continuous ambient-noise recordings were collected. And 510 group velocity dispersion curves in the period band 0.5–5 s were extracted using the vertical component data. And then the three-dimensional shear-wave velocity structure was inverted using group dispersion data by the direct surface-wave tomographic method. Our results are consistent with the geological background of the study area, showing that in the depth range of 0.6–1.5 km, the north side of MJF presents a relatively high velocity, and the south side presents a distribution pattern of high and low velocity. While in the depth range of 1.5–2.0 km, the shear-wave velocity (Vs) model is relatively simple with relatively low velocity on the north side and relatively high velocity on the south side. And the gradient zone of Vs may be the location of the main fracture surface of MJF. The good correspondence between the Vs model and the fault structure indicates that the ambient noise tomography method can be used as an effective method for detecting hidden faults in urban environments.

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“…3 (1) and S 2 , S 1 and S 2 ). The good correspondence between profiles AA' and DD' shows that the V s model can reflect the change of regional geology to a certain extent.…”

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Detection of urban hidden faults using group-velocity ambient noise tomography beneath Zhenjiang area, China

Zheng

Fan

Zhang

et al. 2021

Sci Rep

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“…For example, Melnick et al (2017) suggest that, besides static stress changes, the increased locking appears in segments adjacent to the failed asperity due to a combination of viscoelastic mantle relaxation and afterslip-controlled vertical axis rotation in the upper plate. The studies on the Wenchuan-Lushan sequential events on the Longmenshan fault show accelerated healing of asperity in response to an earthquake on the adjacent asperity (Pei et al, 2019;Zhao et al, 2020). Accordingly, the enhanced postseismic compression and the accelerating accumulation of the elastic strain triggered the second event on the nearby asperity (Li et al, 2018).…”

Section: Effects Of the Acceleration On Event Triggeringmentioning

confidence: 99%

Upper plate response to a sequential elastic rebound and slab acceleration during laboratory-scale subduction megathrust earthquakes

Kosari

Rosenau

Ziegenhagen

et al. 2022

Preprint

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“…After the 7.0 Ms Lushan earthquake in 2013, many studies focused on focal mechanisms and rupture processes of seismicity in FBSL (Fang & Hou, 2019;M. Jiang et al, 2017;Zhao et al, 2020). Moreover, some scholars have carried out investigations on magnetic fabrics in the NW and SW of Sichuan Basin; however, these studies mainly discussed the characteristics and significance of Cenozoic structures (Luo et al, 2006(Luo et al, , 2009Luo, Qi, Jia, Wang, & Zeng, 2013) or single fault-related folds (K. Wang, Jia, Luo, Zhang, & Li, 2014)…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of the foreland basin of the southern Longmenshan tectonic belt: New insights from magnetic fabrics

Chen

et al. 2021

Geological Journal

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Multi‐scale intracontinental deformations were developed in response to the tectonic evolution of the southern Longmenshan tectonic belt (LMS) on the eastern margin of the Tibetan Plateau. Detailed studies, including field structural analysis and anisotropy of magnetic susceptibility (AMS), were conducted on sedimentary rocks in the foreland basin of the southern Longmenshan tectonic belt (FBSL) in order to better understand the tectonic evolution of the southern LMS. Field observations show that FBSL deformations are mainly characterized by broad and gentle folds in a NE–SW direction and shallow thrust faults. At least two sedimentary discontinuities and two‐stage deformations occurred after the deposition of Cretaceous strata. Samples of magnetic fabrics from the Qionglai–Changshiba profile were characterized by the triaxial magnetic susceptibility ellipsoids common in sedimentary rocks. The magnetic fabrics of the profile represent a weak deformation that was associated with layer‐parallel shortening before folding and mainly reflect the Mesozoic–Cenozoic NW–SE convergence. There are also the following atypical magnetic fabrics: magnetic foliation that is oblique to the bedding and that was associated with layer‐parallel simple shearing during folding; and magnetic lineation that is to varying degrees oblique to the strike of bedding and represents a superposition of structures. Based on the correlation results of magnetic fabrics for samples of different ages, a tectonic superposition since the Late Indosinian Orogeny was found in FBSL. By combining field structural analysis and magnetic fabrics, it was suggested herein that the FBSL is a propagation product of Mesozoic–Cenozoic deformations of southern LMS to the southeast, which therefore experienced a composite superposition of deformations. This finding provides the basis for a comprehensive understanding of the southern LMS and may shed light on the uplift of the eastern margin of the Tibetan Plateau and the tectonic response of its eastern boundary.

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Coupling fraction and relocking process of the Longmenshan Fault Zone following the 2008 Mw7.9 Wenchuan earthquake

Cited by 26 publications

References 39 publications

Detection of urban hidden faults using group-velocity ambient noise tomography beneath Zhenjiang area, China

Detection of urban hidden faults using group-velocity ambient noise tomography beneath Zhenjiang area, China

Upper plate response to a sequential elastic rebound and slab acceleration during laboratory-scale subduction megathrust earthquakes

Structural analysis of the foreland basin of the southern Longmenshan tectonic belt: New insights from magnetic fabrics

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