Coseismic reverse- and oblique-slip surface faulting generated by the 2008 Mw 7.9 Wenchuan earthquake, China

Xu, Xiwei; Xu, Wen; Yu, Guihua; Chen, Guihua; Klinger, Yann; Hubbard, Judith; Shaw, John H.

doi:10.1130/g25462a.1

Cited by 722 publications

(760 citation statements)

References 12 publications

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“…The LMS fault system, which marks the border of the Songpan-Ganzi block of eastern Tibet and the Sichuan block of the Yangtze craton, is dominated by dextral strike-slip and has a significant thrust component (Burchfiel et al, 1995;. The 12 May 2008 Wenchuan earthquake, characterized by a crustal shortening of 8.5 m and an uplift of 7.5 m, confirms the view that the east Tibetan escape flow is responsible for the high topography in this region (Xu et al 2009). …”

Section: Introductionmentioning

confidence: 62%

Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin

Zhang

Yuan

Chen

et al. 2010

Earth and Planetary Science Letters

203

137

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GPS displacement vectors show that the crust in east Tibet is being squeezed in an easterly direction by the northward motion of the Indian plate, and the Sichuan Basin is resisting this stream and redirecting it mainly towards Indochina. The Longmen Shan, containing the steepest rise to the high plateau anywhere in Tibet, results from the strong interaction between the east Tibetan escape flow and the rigid Yangtze block (Sichuan Basin), but the kinematics and dynamics of this interaction are still the subject of some debates. We herein present results from a dense passive-source seismic profile from the Sichuan Basin into eastern Tibet in order to study the deep structure of this collision zone. Using P and S receiver function

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Section: Introductionmentioning

confidence: 62%

Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin

Zhang

Yuan

Chen

et al. 2010

Earth and Planetary Science Letters

203

137

View full text Add to dashboard Cite

show abstract

“…In addition, the last three subevents with strike-slip faulting required a larger dip angle (~55°), compared with those with the thrust faulting (cf. Shen et al 2009;Xu et al 2009a). Table 1 shows the latter strike-slip ruptures with slightly normal faulting, which are different from the previous source rupture models (e.g., Wang et al 2008;Shen et al 2009;Nakamura et al 2010).…”

Section: Discussionmentioning

confidence: 70%

“…The location of mechanism transformation is near the town of Beichuan (Fig. 1), where field surveys also denoted the change in fault status (Liu-Zeng et al 2009;Xu et al 2009a). The multiple-event analysis from this study is also comparable with the work of Wen et al (2012), using the EGF deconvolution to reveal the time in change of faulting mechanism is ~35 sec.…”

Section: Discussionmentioning

confidence: 99%

“…Field surveys identified an obvious surface rupture terminating near the town of Shikan (also see Fig. 1) (Liu-Zeng et al 2009;Xu et al 2009a). Ji and Hayes (2008) and Nishimura and Yagi (2008) first reported source rupture models for the 2008 Wenchuan earthquake from body-wave inversions and was comparable with others (e.g., Hashimoto et al 2010;Nakamura et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Multiple Event Analysis of the 2008 Mw 7.9 Wenchuan Earthquake: Implications for Variations in Radiated Seismic Energy During Faulting

Hwang¹

2013

Terr. Atmos. Ocean. Sci.

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A forward modeling of P-waves for the 2008 Wenchuan earthquake revealed at least seven sub-events that occurred during faulting with the largest event (i.e., the third sub-event) located at a position ~50 km northeast of the epicenter. Simulations of P-waves showed that it would be more appropriate to model the P-waves using thrust faulting for the first three sub-events and using strike-slip faulting for the last four. In other words, the faulting for the 2008 Wenchuan earthquake was composed substantially of two mechanisms; the former was a thrust faulting and the latter was a strike-slip rupture. The mechanical transition was near the town of Beichuan, ~100 km northeast of the epicenter. Variations in radiated seismic energy (E S ) showed the largest E S released from the fourth sub-event. Results also indicated remarkable distinctions between E S and E S0 (called the available energy). On the whole, the total E S , which was higher than E S0 estimated from static stress drop, suggested that the earthquake should be interrupted by a stress model of abrupt-locking. Further, the former thrust faulting released a relatively lower amount of E S than the latter strike-slip event. Orowan's stress model, i.e., E S ≈ E S0 , can specify former thrust ruptures implying a high rupture velocity. Because E S > E S0 for latter strike-slip ruptures, a stress model of abrupt-locking, implying higher dynamic stress drop and lower friction during an earthquake, can account for the feature of the latter ruptures. This might suggest that the 2008 Wenchuan earthquake should have a high rupture velocity, perhaps approaching the crustal Swave velocity or even higher.

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“…The 2008 Wenchuan earthquake (the mainshock of the 2008 WES) is considered to be initiated on YingxiuBeichuan fault and then propagated northeastward on a surface rupture zone of about 220 km long on the YingxiuBeichuan-Qingchuan fault and 70 km long on the AnxianGuanxian-Jiangyou fault (Lin et al 2009;Liu-Zeng et al 2009Xu et al 2009). These faults were relatively quiescent in seismicity (Loveless and Meade 2011;Meade 2007).…”

Section: Introductionmentioning

confidence: 99%

Focal Mechanism Solutions of the 2008 Wenchuan earthquake sequence from P-wave polarities and SH/P amplitude ratios: new results and implications

Tian

Ning

Yu³

et al. 2013

Earthq Sci

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The 2008 Wenchuan earthquake, a major intraplate earthquake with M w 7.9, occurred on the slowly deforming Longmenshan fault. To better understand the causes of this devastating earthquake, we need knowledge of the regional stress field and the underlying geodynamic processes. Here, we determine focal mechanism solutions (FMSs) of the 2008 Wenchuan earthquake sequence (WES) using both P-wave first-motion polarity data and SH/P amplitude ratio (AR) data. As P-wave polarities are more reliable information, they are given priority over SH/

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Coseismic reverse- and oblique-slip surface faulting generated by the 2008 Mw 7.9 Wenchuan earthquake, China

Cited by 722 publications

References 12 publications

Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin

Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin

Multiple Event Analysis of the 2008 Mw 7.9 Wenchuan Earthquake: Implications for Variations in Radiated Seismic Energy During Faulting

Focal Mechanism Solutions of the 2008 Wenchuan earthquake sequence from P-wave polarities and SH/P amplitude ratios: new results and implications

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