| 講演要旨(和文) | | 仙台市新長町の鉄道地震検知点における浅部から深部までの地下速度構造を把握することを目的に，半径数10〜数100mのアレー微動観測を複数回実施した．広帯域の周波数帯に対して400m/s〜3km/s程度のレイリー波位相速度が得られ，逆解析結果より深さ600m程度にVs 3km/s以上の地震基盤面があることが推定された．また地震検知点で収録された中規模地震データを利用して，P波からS波を推定する手法（津野・宮腰，2019）の適用性を検証した． |
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| | 講演要旨(英文) | | To understand subsurface structure from shallow to deep parts at the railway seismic station located in Shin-Nagamachi, Sendai, we performed array measurements of microtremors with a radius of several tens to several hundreds of meters. As a result, Rayleigh wave phase velocities of 400 to 3,000 m/s were obtained, and a seismic bed rock with Vs 3,000 m/s or more at a depth of about 600 m was estimated in the inversion analysis. We, also, verified the applicability of the method for estimating S-waves from P-waves using the on-site P-wave EEW technique. |
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