IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2012  > Vol9 No.3
The Origin of the 2008 Wenchuan Earthquake Determined by the Analysis on the Active Longmenshan Nappe in Terms of Rockmass Mechanics
YAN Zhixin; MA Guozhe; YUAN Binxiang; NIU Fujun
Corresponding AuthorMA Guozhe
2012-06
Source PublicationJournal of Mountain Science
Volume9Issue:3Pages:395-402
AbstractOn 12 May 2008, the magnitude 8.0 Wenchuan Earthquake occurred along the Longmen Shan nappe, Sichuan, China. This devastating earthquake led to a heavy death toll of greater than 80,000. The seismic origin of this earthquake is currently hotly debated. We suppose that it is a special type of intraplate earthquake called an active-nappe-type earthquake. Using a holistic methodology, incorporating rockmass structure cybernetics and Byerlee’s law, we present a comprehensive study on the geological origin of macroseisms in the Longmen Shan area and the seismic origin of the 2008 Wenchuan earthquake. Previous studies of neotectonic activity indicate that the Longmen Shan nappe moves at a rate of 1~3 mm/yr, due to horizontal compressive stress from the Tibetan Plateau. The difference between movement rates in the Bayankala block, Longmen Shan nappe and Sichuan Basin cause slow shear stress and strain accumulation in the Longmen Shan nappe. It is exhibited a relatively simple linear relations for the shear strength and the buried depth of the structural planes, and the detachment layer of the nappe has a higher shearing-sliding strength compared to the overlying fault planes and the underlying ductile shear belts, thus making it more prone to stick-slip deformation. Therefore, the detachment layer was the main section responsible for the Wenchuan earthquake. The initial rupture burst in the detachment layer under the YingxiuBeichuan fault, the rupture area nearly 1.4454 × 104 km2encompassed the cross point of the Yingxiu and the Anxian–Guanxian faults with the detachment layer, then caused the YingxiuBeichuan and Anxian–Guanxian faults took an active part in this earthquake, so this earthquake might consist of three chain-like earthquake stages, totally increasing the duration of this earthquake an unusually large amount, to 120 s. The focal depth spanned range of 1020kmconsistent with the observed result of this focal depth by several agencies.
KeywordActive Nappe Rockmass Structure Cybernetics Shear-slip Failure Wenchuan Earthquake Seismicorigin
DOI10.1007/s11629-009-2256-z
Indexed BySCI
Language英语
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5108
CollectionJournal of Mountain Science_Journal of Mountain Science-2012_Vol9 No.3
Corresponding AuthorMA Guozhe
Recommended Citation
GB/T 7714
YAN Zhixin,MA Guozhe,YUAN Binxiang,et al. The Origin of the 2008 Wenchuan Earthquake Determined by the Analysis on the Active Longmenshan Nappe in Terms of Rockmass Mechanics[J]. Journal of Mountain Science,2012,9(3):395-402.
APA YAN Zhixin,MA Guozhe,YUAN Binxiang,&NIU Fujun.(2012).The Origin of the 2008 Wenchuan Earthquake Determined by the Analysis on the Active Longmenshan Nappe in Terms of Rockmass Mechanics.Journal of Mountain Science,9(3),395-402.
MLA YAN Zhixin,et al."The Origin of the 2008 Wenchuan Earthquake Determined by the Analysis on the Active Longmenshan Nappe in Terms of Rockmass Mechanics".Journal of Mountain Science 9.3(2012):395-402.
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