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Structural features of the central Longmen Mountains and the Wenchuan earthquake in Sichuan,China

LIU Shu-gen,TIAN Xiao-bin,LI Zhi-wu,SUN Wei,GUO Bing,LIU ShunState Key Laboratory of Oil And Gas Reservoir Geology and Exlpoitation,Chengdu University of Technology,Chengdu 610059,China  
The central Longmen Mountains has special structural features and lithospheric structure based on field geology,drilling data and geophysical data.The central Longmen Mountains has the fastest uplift rate and highest uplift scope in ~10 Ma.The central-northern parts of Longmen Mountains have weaker tectonic activities than the southern part during Himalayan period.There is a high resistive anomalous body(10 000 Ω·m),a +0.015 cm/s2 residual Bouguer gravity anomaly(60 km×60 km~120 km ×120 km) and a positive isostatic gravity anomaly in the central Longmen Mountains.Comparing the distribution features of the epicenters of the Wenchuan main and aftershocks and the structural features in Longmen Mountains,the hypocenters of the Wenchuan main and aftershocks are located in the active footwall(on the Yangtze Block) of the Yingxiu-Beichuan main fault.The footwall subducts to the eastern Himalaya plateau margin with sinistral strike-slip.The Wenchuan earthquake occurred as a result of the synthesis of the L-type subduction of Yangtze Block,the clockwise rotation of Sichuan Basin and the thrust and uplift in Qinghai-Tibet Plateau.The Wenchuan earthquake is probably a new-typed tectonic earthquake locating on the margin of a stiff block.The authors suggest that more attention should be paid to the gravity field on the margins of main blocks in our country,especially the residual Bouguer gravity anomaly and isostastic gravity anomaly.
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