Accuracy of the water column approximation in numerically simulating propagation of teleseismic pp waves and rayleigh waves
文献类型：期刊论文
| 作者 | Zhou, Yong1,2; Ni, Sidao1; Chu, Risheng1; Yao, Huajian3 |
| 刊名 | Geophysical journal international
 |
| 出版日期 | 2016-08-01 |
| 卷号 | 206期号:2页码:1315-1326 |
| 关键词 | Numerical approximations and analysis Body waves Surface waves and free oscillations Theoretical seismology Wave propagation |
| ISSN号 | 0956-540X |
| DOI | 10.1093/gji/ggw212 |
| 通讯作者 | Ni, sidao(sdni@whigg.ac.cn) |
| 英文摘要 | Numerical solvers of wave equations have been widely used to simulate global seismic waves including pp waves for modelling 410/660 km discontinuity and rayleigh waves for imaging crustal structure. in order to avoid extra computation cost due to ocean water effects, these numerical solvers usually adopt water column approximation, whose accuracy depends on frequency and needs to be investigated quantitatively. in this paper, we describe a unified representation of accurate and approximate forms of the equivalent water column boundary condition as well as the free boundary condition. then we derive an analytical form of the pp-wave reflection coefficient with the unified boundary condition, and quantify the effects of water column approximation on amplitude and phase shift of the pp waves. we also study the effects of water column approximation on phase velocity dispersion of the fundamental mode rayleigh wave with a propagation matrix method. we find that with the water column approximation: (1) the error of pp amplitude and phase shift is less than 5 per cent and 9a degrees at periods greater than 25 s for most oceanic regions. but at periods of 15 s or less, pp is inaccurate up to 10 per cent in amplitude and a few seconds in time shift for deep oceans. (2) the error in rayleigh wave phase velocity is less than 1 per cent at periods greater than 30 s in most oceanic regions, but the error is up to 2 per cent for deep oceans at periods of 20 s or less. this study confirms that the water column approximation is only accurate at long periods and it needs to be improved at shorter periods. |
| WOS关键词 | SPECTRAL-ELEMENT METHOD ; AMBIENT SEISMIC NOISE ; HALF-SPACE ; FINITE-DIFFERENCE ; DISPERSION COMPUTATIONS ; 410-KM DISCONTINUITY ; SOUTHERN CALIFORNIA ; ADJOINT TOMOGRAPHY ; 2-STATION ANALYSIS ; ARRAY TOMOGRAPHY |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000379772500041 |
| 出版者 | OXFORD UNIV PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2374528 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Ni, Sidao |
| 作者单位 | 1.Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan 400077, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Sci & Technol China, Mengcheng Natl Geophys Observ, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Yong,Ni, Sidao,Chu, Risheng,et al. Accuracy of the water column approximation in numerically simulating propagation of teleseismic pp waves and rayleigh waves[J]. Geophysical journal international,2016,206(2):1315-1326. |
| APA | Zhou, Yong,Ni, Sidao,Chu, Risheng,&Yao, Huajian.(2016).Accuracy of the water column approximation in numerically simulating propagation of teleseismic pp waves and rayleigh waves.Geophysical journal international,206(2),1315-1326. |
| MLA | Zhou, Yong,et al."Accuracy of the water column approximation in numerically simulating propagation of teleseismic pp waves and rayleigh waves".Geophysical journal international 206.2(2016):1315-1326. |
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来源：中国科学院大学
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