Structural Features of the Central Longmen Mountains and the Wenchuan Earthquake in Sichuan Province, China

详细信息   

• 责任者：Liu Shugen (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Tian Xiaobin
• 刊名：Journal of Chengdu University of Technology
• 出版年：2008
• 卷期：35(4)
• 关键词：大震 ; large earthquakes ; 龙门山断裂带 ; Longmenshan Fracture Zone
• 页码：p.388-397
• 图表：9 illus., 21 refs.
• 分类号：0500
• issnNo：ISSN1671-9727
• isbnNo：CN51-1634/N

摘要

///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, a +0.015 cm/s² residual Bouguer gravity anomaly 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 of the Yingxiu-Beichuan main fault. 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.