DOI: 10.1002/grl.50147
论文题名: Estimating the effect of Earth elasticity and variable water density on tsunami speeds
作者: Tsai V.C. ; Ampuero J.-P. ; Kanamori H. ; Stevenson D.J.
刊名: Geophysical Research Letters
ISSN: 0094-9319
EISSN: 1944-9050
出版年: 2013
卷: 40, 期: 3 起始页码: 492
结束页码: 496
语种: 英语
英文关键词: elasticity
; tsunami
; variable density
Scopus关键词: Compressibility
; Elastic deformation
; Elasticity
; Speed
; Arrival time
; Compressibility correction
; Elastic effects
; First-order
; Shallow-water
; Tsunami waves
; Variable density
; Water density
; Tsunamis
; correction
; deformation
; Earth
; elasticity
; seawater
; shallow water
; tsunami
英文摘要: The speed of tsunami waves is typically calculated using the shallow-water approximation over a rigid-body Earth. Recent comparisons of tsunami arrival times from the 11 March 2011 tsunami suggest, however, that the standard formulation has errors around the 1% level, and it has been suggested that the elasticity of the Earth can explain the discrepancy. While previous work has indeed shown that such elastic deformation can modify tsunami speeds, the effect has been neglected partly due to the difficulty in understanding how large this elastic effect is. Here, we remedy this by providing a new derivation and expression for how to incorporate the first-order effect that solid Earth elasticity and ocean water compressibility have on tsunami speeds. This result is shown to agree approximately with previous theory and helps to explain observed timing discrepancies from the 11 March 2011 tsunami. The dispersive elastic correction and the non-dispersive compressibility correction together may account for the majority of the observed discrepancy. Key Points Elastic deformation of the Earth has a significant effect on tsunami speeds Variable water density has a significant effect on tsunami speeds The two effects account for most of the discrepancy in tsunami arrival times ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878181832&doi=10.1002%2fgrl.50147&partnerID=40&md5=975e10d93c930f49d11faa34f34fca53
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6583
Appears in Collections: 气候减缓与适应
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作者单位: Seismological Laboratory, MS 252-21, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, United States
Recommended Citation:
Tsai V.C.,Ampuero J.-P.,Kanamori H.,et al. Estimating the effect of Earth elasticity and variable water density on tsunami speeds[J]. Geophysical Research Letters,2013-01-01,40(3).