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	Seismic ground motion amplification in a 3D sedimentary basin: the effect of the vertical velocity gradient
	Qin, Yanfang ; Wang, Yanbin ; Takenaka, Hiroshi ; Zhang, Xianbing
	2012
关键词	ground motion amplification seismic wave propagation sedimentary basin velocity gradient parallel computing FINITE-DIFFERENCE METHOD 1999 CHI-CHI WAVE PROPAGATION HETEROGENEOUS MEDIA FOURIER METHOD TAIPEI BASIN SV-WAVE EARTHQUAKE SIMULATIONS SEISMOGRAMS
DOI	10.1088/1742-2132/9/6/761
英文摘要	Ground motion amplification in sedimentary basins has been observed in some moderate or large earthquakes, such as the 1994 Northridge and 1999 Chi-Chi event. Many numerical studies with simplified 2D models have shown significant effects of the vertical velocity gradient of sediment on basin amplification. However, we need to consider a more realistic 3D model and solve wave equations with 3D numerical methods in order to improve our understanding of basin amplification. In this study, we extend a 2D pseudospectral and finite difference hybrid method to a 3D case and investigate the effects of the vertical velocity gradient for a 3D basin model. Numerical simulations were performed for four basin models with increasing vertical velocity gradients on a PC cluster using 64 processors for 67 108 864 discretized grids. The results show that the vertical velocity gradient enhances basin amplification through strong secondary surface waves and basin trapped waves. The 3D geometry of the basin causes a wave-front focusing effect that contributes significantly to a localized strong amplification with the maximum peak ground velocity in the basin. The results of this study suggest that it is important to consider the detailed properties of sedimentary basins in seismic ground motion studies.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312213500014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; SCI(E); 4; ARTICLE; 6; 761-772; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311118]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Qin, Yanfang,Wang, Yanbin,Takenaka, Hiroshi,et al. Seismic ground motion amplification in a 3D sedimentary basin: the effect of the vertical velocity gradient[J],2012.
APA	Qin, Yanfang,Wang, Yanbin,Takenaka, Hiroshi,&Zhang, Xianbing.(2012).Seismic ground motion amplification in a 3D sedimentary basin: the effect of the vertical velocity gradient..
MLA	Qin, Yanfang,et al."Seismic ground motion amplification in a 3D sedimentary basin: the effect of the vertical velocity gradient".(2012).

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