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Title: S波コーダ振幅から推測される北海道東部における2次元不均質構造
Other Titles: 2-D Heterogeneous Structure in Eastern Hokkaido Inferred from S-wave Coda Amplification Factors
Authors: TAIRA, Taka'aki1 Browse this author
YOMOGIDA, Kiyoshi2 Browse this author
Authors(alt): 平, 貴昭1
蓬田, 清2
Issue Date: 15-Mar-2006
Publisher: 北海道大学大学院理学研究科地球惑星科学専攻(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: 69
Start Page: 113
End Page: 122
Abstract: We examined 2-D heterogeneous structure in the eastern Hokkaido region, using the S-wave coda amplification factor (CAF) with seismic storong-motion date of Kyoshin Net(K-NET). CAF is defined as the spectral ratio of coda waves among different stations after corrections for source, site, and overall propagation.(i.e,cada-Q) effects. Confirming that code-Q values are nearly independent of both source and station, the site effect at each station was esetimated by the coda-normalization method. The source effect was removed by taking the spectral ratio of S-wave coda among stations for each earthquake. We evaluated the CAF value of each source-station pair for three components,using 95 seismograms for five local earthquakes recorded at 21 stations of K-NET. A map of CAF values at the frequency band of 16 Hz shows a systematic variation, implying that heterogeneities are concentrated at the central area (Shibeccha) in the eastern Hokkaido region, manifested locally as a large degree of scattering.
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69号

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