Structural model of 2008 Mw 7.9 Wenchuan earthquake in the rejuvenated Longmen Shan thrust belt, China

Jia, Dong; Li, Yiquan; Lin, Aiming; Wang, Maomao; Chen, Wei; Wu, Xiao-Jun; Ren, Zhikun; Zhao, Yao; Luo, Li

doi:10.1016/j.tecto.2009.08.040

Cited by 157 publications

(132 citation statements)

References 47 publications

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“…The wide D-peaks (D w ≈ 250 cm −1 ) and D-peaks lower than the G-peaks in the Raman spectra of the CMVs are comparable to the features of the spectra of the CMs that have experienced a zeolite facies grade metamorphism (Yui et al 1996) or a <250°C grade metamorphism (Rahl et al 2005). This estimated temperature matches the burial depth of the Xujiahe Formation well, which is no more than 8 km in the western Sichuan Basin (Jia et al 2010).…”

Section: Origin Of Cms For the Cmvssupporting

confidence: 68%

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Jiang

Zhang

et al. 2016

Earth Planet Sp

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This paper establishes a reference data set of carbonaceous materials (CMs) from the active fault zone of the Longmen Shan fault belt that ruptured in the 2008 Mw7.9 Wenchuan earthquake and presents an application of these data for studies of both other exhumed carbonaceous-rich fault zones and deep-drilling cores. The CMs distributed in the active fault zone are found as narrow veins and located along the slip surfaces. Microstructural observation shows that the carbonaceous material veins (CMVs) are located along slip surfaces in the fault gouge zones. Some CMVs have a cataclastic fabric, and their branches intrude into voids around the slip surfaces. Raman spectra of the CMVs show a wide (full width at half maximum >200 cm −1 ) D-peak at~1345 cm −1 (defect peak), which is much lower than the O-peak at~1595 cm −1 (ordered peak), indicating a metamorphic temperature of zeolite facies or lower than 250°C. In addition, the stable carbon isotopic compositions (δ 13 C values) of the CMVs, ranging from −23.4 to −26.4‰, are very similar to that of the kerogen collected from the Late Triassic Xujiahe Formation in Sichuan Basin. Given the data at which it may be formed, the Xujiahe Formation is the most likely origin of CMs for the CMVs, and it seems that some CMVs in the fault zone were crushed and intruded into the voids during coseismic events, possibly driven by an enhanced pore fluid pressure. Since graphitization is suggested as an indicator of transient frictional heating in this area, our study providing a reference data set of CMs would help future CM-rich fault-zone research to retrieve seismic signatures presumably occurring in the Longmen Shan fault zone belt.

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Section: Origin Of Cms For the Cmvssupporting

confidence: 68%

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Jiang

Zhang

et al. 2016

Earth Planet Sp

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“…The primary direction of σ H in Yong'an borehole can be defined as NWW direction. Comparing to mode of faulting, global position system (GPS) data related to the Longmenshan region, focal mechanism solution (FMS) of the Wenchuan earthquake (main shock and aftershocks M ≥ 4), and stress database of continental China, it can be stated that the preponderant orientations of σ H in the Yingxiu, Leigu, and Yong'an boreholes are consistent with these geological and geophysical results, although the NNW-SN direction in deep depth in Leigu borehole shows some scatter (Liu et al, 2012;Jia et al, 2010;Xie et al, 2003;Yi et al, 2012). The scatter may be induced by the adjustments of the Longmenshan fault belt after the main shock, the reactivation of pre-existing sub-faults and the NNW trending Minshan fault in this region that are motivated by adjustment of the regional crustal stress field (Yi et al, 2012).…”

Section: Orientations Of σ Hmentioning

confidence: 85%

In-situ stress measurements along the Beichuan-Yingxiu fault after the Wenchuan earthquake

Qin

Chen

et al. 2015

Engineering Geology

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“…Petroleum seismic reflection data [35] indicate that along the southwestern part of the seismogenic fault, the Yingxiu-Beichuan and Guanxian-Anxian faults plunge at different angles, with the former being steep and the latter gentle, they converge at a depth of about 8-10 km. The merged deep fault ramp can reach depths of 18-20 km, as a transition to the inferred main detachment zone ( Figure 4).…”

Section: Rupture Of Two Fault Ramps Change Of Kinematic Properties Omentioning

confidence: 99%

“…Shen et al [34] simulated the attitude change and rupture process of the seismogenic fault using InSAR and GPS data. Jia et al [35] analyzed the relationships between tectonic features of the upper crust of the Longmenshan fault zone and those of the Wenchuan earthquake using petroleum seismic exploration data. These data are of significant importance for the study of deep-seated activity of the seismogenic fault.…”

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confidence: 99%

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Discussion of rupture mechanisms on the seismogenic fault of the 2008 M s8.0 Wenchuan earthquake

Deng

Chen

Zhu

2011

Sci. China Earth Sci.

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The May 12, 2008, M s 8.0 Wenchuan earthquake was the outcome of a recent movement of an active intra-continental thrust fault zone. The seismogenic fault of this earthquake underwent oblique-slip faulting along the central fault and pure thrust faulting along the range-front fault of the Longmenshan fault zone. The former had a steep dip and large vertical displacement, and the latter had a gentle dip and little vertical displacement. The fault zone consisted of compressive double fault ramps rupturing with right-lateral strike-slip components resulting from strain partitioning of a deep oblique slip fault in the brittle zone of the upper crust. The kinematic pattern and rupture mechanisms are complex for the seismogenic fault, as indicated by the geometric pattern of its surface ruptures, the coseismic displacement distribution and focal mechanisms of the main shock and aftershocks. As a tear fault, the NW-trending, left-lateral, strike-slip Xiaoyudong fault zone has accommodated NE-trending displacements with different shortening amounts. However, because of intense compression on the southwestern segment of the seismogenic fault, the left-lateral, strike-slip Xiaoyudong fault also carries a clear compression component. Normal faulting with a strike-slip component controls the formation of a fault-trough along the central fault, which is characterized by thrusting with a strike-slip component and strike-slip with thrusting. The fault-troughs are the product of the interaction of slip and gravity on the seismogenic fault under specific geological and geomorphic conditions. Gravitational force exaggerated the vertical component of fault displacement, which by no means represents the actual maximum vertical displacement of the seismogenic fault. M s 8.0 Wenchuan earthquake, seismogenic fault, rupture mechanism, gravitation, tear fault Citation: Deng Q D, Chen G H, Zhu A L. Discussion of rupture mechanisms on the seismogenic fault of the 2008 M s 8.0

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Structural model of 2008 Mw 7.9 Wenchuan earthquake in the rejuvenated Longmen Shan thrust belt, China

Cited by 157 publications

References 47 publications

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

In-situ stress measurements along the Beichuan-Yingxiu fault after the Wenchuan earthquake

Discussion of rupture mechanisms on the seismogenic fault of the 2008 M s8.0 Wenchuan earthquake

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