書誌事項
- タイトル別名
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- A Three-dimensionally Heterogeneous Structure Model for Seismic Wavefield Simulation in Northwestern Kagoshima Region
- ジシン ハドウ シミュレーション ノ タメ ノ カゴシマケン ホクセイブ ニ オケル 3ジゲン ソクド コウゾウ モデル
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Recently, the dramatic development of computer resources and computational techniques have allowed us to calculate the seismic wavefield in three-dimensionally heterogeneous structure model (3-D model). The construction of more realistic 3-D model is a key to success for strong-motion prevention or source inversion using Green's functions of the 3-D model.<br>The purpose of this study is to construct a 3-D model which has an adequate ability for seismic wavefield simulation. We have constructed the 3-D model in northwestern Kagoshima region of Kyushu island, Japan using all kinds of geophysical and geological data which were well investigated in the study area. The 3-D model consists of six layers with width of 80km, length of 80km and depth of 40km. We estimated a depth for a top of each layer and next assigned P-wave velocity to the top and its gradient for each layer.<br>Using the constructed 3-D model we then simulate the seismic waveforms for two small earthquakes (M4.6, M3.6) by the finite-difference method to assess the ability of the 3-D model for seismic motion simulation with frequency range between 0.1 and 1Hz. These test events are aftershocks of the 1997 Northwestern Kagoshima, Japan, earthquakes, which were well recorded at our stations located on near-field hard rock sites and K-NET (NIED) stations.<br>As the results, it can then be seen that the synthetic waveforms agree with the observed waveforms in these P and S phases. The synthetics calculated using the 3-D model explain the later phases of the observed waveforms much better than the ones obtained by using a conventional 1-D model, which suggests that our 3-D model is suitable for seismic wavefield simulations in this frequency range. The constructed 3-D model can be applied to the strong motion simulations or source inversions using the 3-D Green's functions for large events occurring in this region, such as the mainshocks of the 1997 Northwestern Kagoshima earthquakes (M6.5, M6.3).
収録刊行物
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- 地震 第２輯
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地震 第２輯 57 (3), 365-375, 2005
公益社団法人 日本地震学会
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詳細情報 詳細情報について
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- CRID
- 1390282679282245248
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- NII論文ID
- 40006993251
- 130006787537
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- NII書誌ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL書誌ID
- 7699411
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- JaLC
- NDL
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