Solution of Green function from a moving line source and the radiation energy analysis : A simplified modeling of seismic signal induced by high-speed train

doi:10.6038/cjg2019M0654

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院油气资源研究重点实验室

	Solution of Green function from a moving line source and the radiation energy analysis : A simplified modeling of seismic signal induced by high-speed train
	Cao Jian 1,2,3; Chen JingBo 1,2,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2019-06-01
卷号	62 期号:6 页码:2303-2312
关键词	Green function High-speed train Half and full space Frequency-spectrum feature Radiation directivity
ISSN号	0001-5733
DOI	10.6038/cjg2019M0654
英文摘要	In exploration seismology, a controlled seismic source, such as dynamite or vibroseis, is used to send elastic waves into the Earth, where each medium discontinuity interface reflects a portion of wave energy back to the surface and allows the rest to transmit through the interface. This physical process can be modelled in mathematics. The controlled seismic source is represented by a body force acting at a particular point of the medium, and Green function describes the propagation of elastic waves induced by this unit impulse body force within a full-space or half space medium. They formed the most important theoretical bases of exploration seismology. Nowadays, the moving high-speed train can also be viewed as another controlled seismic source due to its length, travel speed and weight are fixed and can be measured easily. To use this source for estimating the properties of the Earth's subsurface, we need to study the characteristic of elastic waves induced by it. In this paper, we regard the moving high-speed train as a moving line source to simplify the modeling process and present its Green function in the half space and full space, respectively. By analyzing the far-field term of Green function in the full space asymptotically, the characteristics of frequency and radiation directivity for this moving line source are shown. In addition, to evaluate the feasibility of modeling the high-speed train by a moving line source, a comparison between the real data and synthetic data in the near field is also performed, where the synthetic data are obtained by the finite-difference method with the stress-free condition since the proposed half-space Green function is too complex to be calculated analytically. These results will contribute to the study and utilization of seismic signal generated by the high-speed train.
WOS关键词	FREE-SURFACE ; PROPAGATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000470821500028
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92537]
专题	地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者	Cao Jian
作者单位	1.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Joint Res Grp High Speed Rail Seismol, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cao Jian,Chen JingBo. Solution of Green function from a moving line source and the radiation energy analysis : A simplified modeling of seismic signal induced by high-speed train[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(6):2303-2312.
APA	Cao Jian,&Chen JingBo.(2019).Solution of Green function from a moving line source and the radiation energy analysis : A simplified modeling of seismic signal induced by high-speed train.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(6),2303-2312.
MLA	Cao Jian,et al."Solution of Green function from a moving line source and the radiation energy analysis : A simplified modeling of seismic signal induced by high-speed train".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.6(2019):2303-2312.