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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: 地震計鉛直アレー記録の相分解法の改良
Other Titles: An Improvement to the Phase Decomposition Analysis of Seismic Vertical Array Records
Authors: 吉田, 邦一1 Browse this author
Authors(alt): YOSHIDA, Kunikazu1
Issue Date: 19-Mar-2010
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 73
Start Page: 175
End Page: 183
Abstract: I modify a vertical array analysis method that decomposes complex seismograms into body and surface wave time histories that have been proposed by Yoshida and Sasatani(2008). In the previous study, P, S and surface waves at the surface were decomposed by a least-squares method without any weighting. In the present study, the data are weighted by using the maximum amplitude of each spectrum of seismograms. I carried out a numerical test of this method with synthetic vertical array records consisting of vertically incident plane P and S waves and laterally incident plane Love and Rayleigh waves. P, S, Love, and Rayleigh waves were perfectly decomposed for synthetic records without noise. I applied this method to real vertical array records from the Ashigara valley, a moderate-sized sedimentary valley. The array records from an earthquake occurring at the depth of 123 km near the array(epicentral distance of about 31 km)I find small difference between the present weighted and the previous non-weighted estimations.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第73号

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