| 講演要旨(和文) | | 観測時間15分程度の半径0.6 mの4点アレイデータ463個を用いて2点法の有効性を検討した．具体的には，アレイごとにすべての地震計のペアに2点法を適用し，通常の4点アレイデータにSPAC法を適用した標準的な解析結果との残差の分布を調べた．その結果，約半分のデータについては，5-10Hzの周波数帯域で十分な精度で位相速度が得られることが明らかになった． |
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| | 講演要旨(英文) | | We have examined the feasibility of miniature, short-time two-point microtreomr arrays, by the use of microtremor data from 463 four-point arrays having radius of 0.6 m with observation durations about 15 min. More concretely, we extracted all pairs of seismographs from each four-point array, and applied a two-point array method to each paer. Then we calculated the misfit between the analysis results by a two-point method and those obtained by applying a standard SPAC method to the corresponding four-point array data. It is revealed that about half of the analysis results by a two-point method had an adequate accuracy. |
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