Accuracy of the moment-tensor inversion of far-field P waves

doi:10.1093/gji/ggz446

IMECH-IR > 流固耦合系统力学重点实验室

	Accuracy of the moment-tensor inversion of far-field P waves
	Kong Y 1; Li M 1; Chen WM(陈伟民)2,4 ; Kang BQ 3
通讯作者	Chen, Weimin(wmchen@imech.ac.cn)
发表期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
	2020
卷号	220 期号:1 页码:248-256
ISSN	0956-540X
摘要	The far-field assumption is widely used and suitable for the moment-tensor inversion in which the source-receiver distance is quite long. However, the description of far field is uncertain and an explicit far-field range is missing. In this study, the explicit far-field range is determined and the errors of moment-tensor solutions produced by the far-field approximation are analysed. The distance, for which the far-field assumption is satisfied and the effect of the near-field term can be ignored, is directionally dependent. For the shear dislocation, in the directions near the nodal lines of the far-field P waves, the far-field distance is heavily dependent on the displacement component used to invert moment tensors. The radial component of displacement, which is parallel to the wave propagation direction, is recommended for the inversion and the corresponding far-field distance is quite short. In the directions far from the nodal lines, the selection of displacement components has little influence on the far-field distance. The maximum far-field distance appears in the directions of the pressure and tensile axes of the source and the value is about 30 wavelengths of radiated waves. Using more receivers (>6) in the moment-tensor inversion can shorten the far-field distance. The effect of the near-field term on the moment-tensor inversion for tensile dislocations and isotropic sources (explosion or implosion) can be ignored. The conclusions obtained in this study are helpful for determining the positions of receivers and evaluating the accuracy of moment-tensor solutions, with far-field assumption being applied in the inversion.
关键词	Inverse theory Bodywaves Earthquake source observations Wave propagation
DOI	10.1093/gji/ggz446
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000506839900016
关键词[WOS]	EARTHQUAKE SOURCE PARAMETERS ; DOUBLE-COUPLE MECHANISMS ; PERIOD SURFACE-WAVES ; NEAR-FIELD ; RAPID-DETERMINATION ; FOCAL MECHANISMS ; DEFORMATION ; CRACKS
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22000000]
项目资助者	Strategic Priority Research Program of the Chinese Academy of Sciences
论文分区	二类
力学所作者排名	1
RpAuthor	Chen, Weimin
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/81311
专题	流固耦合系统力学重点实验室
作者单位	1.Beihang Univ, Sch Aeronaut Sci & Engn, Beijing 100083, Peoples R China; 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 3.Chinese Acad Sci, Technol & Engn Ctr Space Utilizat, Key Lab Space Utilizat, Beijing 100094, Peoples R China; 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Kong Y,Li M,Chen WM,et al. Accuracy of the moment-tensor inversion of far-field P waves[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2020,220,1,:248-256.
APA	Kong Y,Li M,陈伟民,&Kang BQ.(2020).Accuracy of the moment-tensor inversion of far-field P waves.GEOPHYSICAL JOURNAL INTERNATIONAL,220(1),248-256.
MLA	Kong Y,et al."Accuracy of the moment-tensor inversion of far-field P waves".GEOPHYSICAL JOURNAL INTERNATIONAL 220.1(2020):248-256.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Jp2020086.pdf（2405KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览下载