|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第69号 >
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
| 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) |
| URI: | http://hdl.handle.net/2115/21504 |
| 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
|
|
