Mechanisms of Transient Postseismic Deformation Following the 2001 Mw 7.8 Kunlun (China) Earthquake

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	Mechanisms of Transient Postseismic Deformation Following the 2001 Mw 7.8 Kunlun (China) Earthquake
	Diao, Faqi ; Xiong, Xiong ; Wang, Rongjiang
刊名	Pure and Applied Geophysics
	2011
期号	5 页码:767-779
中文摘要	Using global positioning system (GPS) technology, significant postseismic surface displacements were observed within the first 4 months after the 2001 Mw 7.8 Kunlun earthquake which occurred in China. In this study, we investigated the mechanisms that may have possibly contributed to the postseismic deformations that have been observed. Based on the modeling results, we find that an afterslip model can interpret postseismic displacements in the near field even when the fault plane is extended to the bottom of the crust (similar to 70 km). Models based on the viscoelastic relaxation theory showed a large discrepancy in the spatial pattern of the deformation compared with what has been observed. Thus, we infer that both mechanisms cannot interpret the observed postseismic deformation independently. A combination of afterslip and viscoelastic relaxation can further improve the data fit, especially at sites far from the fault. With maximum afterslip of similar to 0.4 m occurring at a depth of 10 km in the central section, the combined model shows that the estimated afterslip occurred mostly on and below the coseismic rupture plane, as well as on its eastern extension. The estimated moment released by the afterslip in the first 4 months is almost 40% of that released by the coseismic slip. The best-fitting viscoelastic relaxation model shows a "weak" upper mantle with a viscosity of similar to 1.0 X 10(18) Pa s. The combined model also suggests the existence of a lower crust with viscosity larger than 1.0 X 10(18) Pa s, although it cannot be constrained accurately.
原文出处	://WOS:000289805200002
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn//handle/342008/3026]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Diao, Faqi,Xiong, Xiong,Wang, Rongjiang. Mechanisms of Transient Postseismic Deformation Following the 2001 Mw 7.8 Kunlun (China) Earthquake[J]. Pure and Applied Geophysics,2011(5):767-779.
APA	Diao, Faqi,Xiong, Xiong,&Wang, Rongjiang.(2011).Mechanisms of Transient Postseismic Deformation Following the 2001 Mw 7.8 Kunlun (China) Earthquake.Pure and Applied Geophysics(5),767-779.
MLA	Diao, Faqi,et al."Mechanisms of Transient Postseismic Deformation Following the 2001 Mw 7.8 Kunlun (China) Earthquake".Pure and Applied Geophysics .5(2011):767-779.