| 講演要旨(和文) | | 笠松ほか(2015)の二次元地下構造推定法の適用範囲を調べるために，ラブ波伝播の二次元性を仮定できる盆地端部からの距離と周期の関係を観測記録の水平オービットの長軸方位に基づいて調べた．短周期側ほど二次元性が成り立つ距離は短くなり，周期6秒程度以上は距離70km弱以上，周期2〜5秒は40〜60km程度，周期1秒以下は距離10km以下と急激に狭くなることが分かった． |
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| | 講演要旨(英文) | | To clarify the coverage range of the waveform inversion method to estimate a 2-D structure of deep sedimentary layers proposed by Kasamatsu et al.(2015), we investigated a relations of distances from a basin edge and periods that can be assumed for the 2-D propagation of Love wave in the inversion. We found that the distances in the valid assumption of 2-D propagation are short in the side of short periods. The distances for the Love waves at periods over 6s are more than 70km, while those for the periods from 2s to 5s are around 40-60km. The Love waves at periods shorter than 2s propagate two-dimensionally within 10km. |
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