DOI: 10.1002/2014GL060700
论文题名: Spherical harmonic stacking for the singlets of Earth's normal modes of free oscillation
作者: Chao B.F. ; Ding H.
刊名: Geophysical Research Letters
ISSN: 0094-9895
EISSN: 1944-9626
出版年: 2014
卷: 41, 期: 15 起始页码: 5428
结束页码: 5435
语种: 英语
英文关键词: mode splitting
; normal modes
; spherical harmonic stacking
; transverse displacement field
Scopus关键词: Earthquakes
; Experiments
; Harmonic functions
; Frequency domain analysis
; Societies and institutions
; Spheres
; Autoregressive methods
; Mode splitting
; Normal modes
; Research institutions
; Spherical harmonic functions
; Spherical harmonics
; Sumatra-Andaman earthquake
; Transverse displacements
; Complex frequency
; Displacement field
; Frequency domains
; Harmonic analysis
; earthquake event
; frequency analysis
; harmonic analysis
; seismogram
英文摘要: We extend the spherical harmonic stacking (SHS) method of Buland et al. (1979) for the radial (vertical) component in the seismogram to the transverse (horizontal) components of the displacement field. Taking advantage of the orthogonality of the spherical harmonic functions (scalar and vectorial), SHS isolates and accentuates the signals of individual singlets of the Earth's normal modes of free oscillation. We apply the SHS on the broadband Incorporated Research Institutions for Seismology (IRIS) seismograms from up to 97 IRIS seismic stations for the 2004 Sumatra-Andaman earthquake, in experiments targeted to spheroidal as well as toroidal modes - 2S1, 0S3, 2S2, 3S1, 1S3, 0T2, and 0T 3. We report the complete resolution of the singlet frequencies of these multiplets, some for the first time, and estimate the singlets' complex frequencies using the frequency domain autoregressive method of Chao and Gilbert (1980). The latter contain useful information to be used in inversions for the 3-D structure of the Earth's interior. Key Points A new spherical harmonic stacking method to resolve normal mode singlets We demonstrate the successful application of SHS in real experiments Complete resolution of singlets of interest and new findings are reported © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905299847&doi=10.1002%2f2014GL060700&partnerID=40&md5=0569f8b49b218199cf2b56b49aa4b9f7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7159
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Chao B.F.,Ding H.. Spherical harmonic stacking for the singlets of Earth's normal modes of free oscillation[J]. Geophysical Research Letters,2014-01-01,41(15).