Three-dimensional seismic velocity structure in the Sichuan basin, China

doi:10.1002/2015JB012644

CORC > 北京大学 > 地球与空间科学学院

	Three-dimensional seismic velocity structure in the Sichuan basin, China
	Wang, Maomao ; Hubbard, Judith ; Plesch, Andreas ; Shaw, John H. ; Wang, Lining
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2016
关键词	seismic velocity structure three-dimensional modeling sonic logs seismic reflection profile seismic hazard Sichuan basin LOS-ANGELES BASIN 20 APRIL 2013 LONGMEN SHAN LUSHAN EARTHQUAKE TIBETAN PLATEAU SEDIMENTARY EVOLUTION SOUTHERN CALIFORNIA SOUTHWESTERN CHINA WESTERN SICHUAN SITE CONDITIONS
DOI	10.1002/2015JB012644
英文摘要	We present a new three-dimensional velocity model of the crust in the eastern margin of the Tibetan Plateau. The model describes the velocity structure of the Sichuan basin and surrounding thrust belts. The model consists of 3-D surfaces representing major geologic unit contacts and faults and is parameterized with V-p velocity-depth functions calibrated using sonic logs. The model incorporates data from 1166 oil wells, industry isopach maps, geological maps, and a digital elevation model. The geological surfaces were modeled based on structure contour maps for various units from oil wells and seismic reflection profiles. These surfaces include base Quaternary, Mesozoic, Paleozoic, and Proterozoic horizons. The horizons locally exhibit major offsets that are compatible with the locations and displacements of important faults systems. This layered, upper crustal 3-D model extends down to 10-15km depth and illustrates lateral and vertical variations of velocity that reflect the complex evolution of tectonics and sedimentation in the basin. The model also incorporates 3-D descriptions of V-s and density for sediments that are obtained from empirical relationships with V-p using direct measurements of these properties in borehole logs. To illustrate the impact of our basin model on earthquake hazards assessment, we use it to calculate ground motions and compare these with observations for the 2013 Lushan earthquake. The result demonstrates the effects of basin amplification in the western Sichuan basin. The Sichuan CVM model is intended to facilitate fault systems analysis, strong ground motion prediction, and earthquake hazards assessment for the densely populated Sichuan region.; Harvard China Fund; SCI(E); ARTICLE; maomaowang@fas.harvard.edu; 2; 1007-1022; 121
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438688]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wang, Maomao,Hubbard, Judith,Plesch, Andreas,et al. Three-dimensional seismic velocity structure in the Sichuan basin, China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2016.
APA	Wang, Maomao,Hubbard, Judith,Plesch, Andreas,Shaw, John H.,&Wang, Lining.(2016).Three-dimensional seismic velocity structure in the Sichuan basin, China.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH.
MLA	Wang, Maomao,et al."Three-dimensional seismic velocity structure in the Sichuan basin, China".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2016).