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Surface Rupture and Co-seismic Displacement Produced by the ms 8.0 wenchuan earthquake of May ^(12)th,2008,Sichuan,China:Eastwards Growth of the Qinghai-Tibet Plateau

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Acta Geologica Sinica(English Edition) 2008年第5期82卷 938-948页

作者： DONG Shuwen ZHANG Yueqiao WU Zhenhan YANG Non MA Yinsheng SHI Wei CHEN Zhengle LONG Changxin AN Meijian Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China

An earthquake of ms 8 struck wenchuan County, western Sichuan, China, on May 12^th, 2008 and resulted in long surface ruptures （〉300 km）. The first-hand observations about the surface ruptures produced by the earthquake in the worst-hit areas of Yingxiu, Beichuan and Qingchuan, ascertained that the causative structure of the earthquake was in the central fault zones of the Longmenshan tectonic belt. Average co-seismic vertical displacements along the individual fault of the Yingxiu-Beiehuan rupture zone reach 2.514 m and the cumulative vertical displacements across the central and frontal Longmenshan fault belt is about 5-6 m. The surface rupture strength was reduced from north of Beichuan to Qingchuan County and shows 2-3 m dextral strike-slip component. The wenchuan thrust-faulting earthquake is a manifestation of eastward growth of the Tibetan Plateau under the action of continuous convergence of the Indian and Eurasian continents.

关键词： ms 8.0 wenchuan earthquake surface ruptures co-seismic displacement eastern Tibet

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Dextral-Slip Thrust Faulting and Seismic Events of the ms 8.0 wenchuan earthquake,Longmenshan Mountains,Eastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2009年第4期83卷 685-693页

作者： WU Zhenhan DONG Shuwen Patrick J. BAROSH ZHANG Zuoheng LIAO Huaijun Institute of Geomechanics CAGS Beijing 100081 China Chinese Academy of Geological Sciences Beijing 100037 China P.J. Barosh ＆ Associates 103 Aaron Ave. Bristol RI 02809 USA China Geological Survey Beijing 100037 China Geological Brigade 316 Chongqing 401147 China

Dextral-slip thrust movement of the Songpan-Garze terrain over the Sichuan block caused the ms 8.0 wenchuan earthquake of May 12, 2008 and offset the Central Longmenshan Fault （CLF） along a distance of -250 km. Displacement along the CLF changes from Yingxiu to Qingchuan. The total oblique slip of up to 7.6 m in Yingxiu near the epicenter of the earthquake, decreases northeastward to 5.3 m, 6.6 m, 4.4 m, 2.5 m and 1.1 m in Hongkou, Beichuan, Pingtong, Nanba and Qingchuan, respectively. This offset apparently occurred during a sequence of four reported seismic events, EQ1-EQ4, which were identified by seismic inversion of the source mechanism. These events occurred in rapid succession as the fault break propagated northeastward during the earthquake. Variations in the plunge of slickensides along the CLF appear to match these events. The Mw 7.5 EQ1 event occurred during the first 0-10 s along the Yingxiu-Hongkou section of the CLF and is characterized by 1.7 m vertical slip and vertical slickensides. The Mw 8.0 EQ2 event, which occurred during the next 10-42 s along the Yingxiu-Yanziyan section of the CLF, is marked by major dextralslip with minor thrust and slickensides plunging 25°-35° southwestward. The Mw 7.5 EQ3 event occurred during the following 42-60 s and resulted in dextral-slip and slickensides plunging 10° southwestward in Beichuan and plunging 73° southwestward in Hongkou. The Mw 7.7 EQ4 event, which occurred during the final 60-95 s along the Beichuan-Qingchuan section of the CLF, is characterized by nearly equal values of dextral and vertical slips with slickensides plunging 45°-50° southwestward. These seismic events match and evidently controlled the concentrations of landslide dams caused by the wenchuan earthquake in Longmenshan Mountains.

关键词： ms 8.0 wenchuan earthquake co-seismic slip slickensides seismic events Central Longmenshan Fault Eastern Tibetan Plateau

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Surface deformation related to the 2008 wenchuan earthquake,and mountain building of the Longmen Shan,eastern Tibetan Plateau

Surface deformation related to the 2008 Wenchuan earthquake,...

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中国科学院地质与地球物理研究所第11届（2011年度）...

作者： Satoshi Okuyama Yoshiki Ninomiya Sarah Wright Geological Survey of Japan AISTTsukuba 305-8567Japan School of Earth Sciences University of MelbourneVictoria 3010Australia

The 12 May 2008 M 8.0 wenchuan earthquake,China,was one of largest continental thrusting events worldwide.Based on interpretations of post-earthquake high-resolution remote sensing images and field surveys,we investigated the geometry,geomorphology,and kinematics of co-seismic surface ruptures,as well as seismic and geologic hazards along the Longmen Shan fold-and-thrust belt.Our results indicate that the wenchuan earthquake occurred along the NE-SW-trending Yingxiu-Beichuan and Guanxian-Anxian faults in the Longmen Shan fold-and-thrust belt.The main surface rupture zones along the Yingxiu-Beichuan and Guanxian-Anxian fault zones are approximately 235 and 72 km in length,respectively. These sub-parallel ruptures may merge at depth.The Yingxiu-Donghekou surface rupture zone can be divided into four segments separated by discontinuities that appear as step-overs or bends in map view.Surface deformation is characterized by oblique reverse faulting with a maximum vertical displacement of approximately 10 m in areas around Beichuan County.earthquake-related disasters(e.g., landslides) are linearly distributed along the surface rupture zones and associated river valleys. The wenchuan earthquake provides new insights into the nature of mountain building within the Longmen Shan,eastern Tibetan Plateau.The total crustal shortening accommodated by this great earthquake was as much as 8.5 m,with a maximum vertical uplift of approximately 10 m.The present results suggest that ongoing mountain building of the Longmen Shan is driven mainly by crustal shortening and uplift related to repeated large seismic events such as the 2008 wenchuan earthquake.Furthermore, rapid erosion within the Longmen Shan fold-and-thrust belt occurs along deep valleys and rupture zones following the occurrence of large-scale landslides triggered by earthquakes.Consequently,we suggest that crustal shortening related to repeated great seismic events,together with isostatic rebound induced by rapid erosion-related unloading,is a key component of the geo

关键词： ms 8.0 wenchuan earthquake Co-seismic oblique reverse faulting Crustal shortening Mountain building Longmen Shan Eastern Tibetan Plateau

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