| 講演要旨(和文) | | 2011年東北地方太平洋沖地震(Mw 9.0)では，1.5〜5秒の長周期地震動が品川・川崎の東京湾沿岸部で観測された．特に，東京湾沿岸部に近い地震観測点では，2〜3.5秒の周期帯域で100 cm/sを超える大きな速度応答が観測された．そこで，本研究では，東京湾沿岸部のS波速度構造を理解することを目的に，その地域の6サイトに於いてアレー微動観測を実施した．結果として，Vs 150 m/sとVs400 m/s程度の低速度層が品川・川崎の東京湾沿岸部に厚く堆積していることが分かった． |
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| | 講演要旨(英文) | | During the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0), large ground motions for a period of 1.5 to 5 seconds were observed in the Tokyo Bay area of Shinagawa to Kawasaki. Especially near the coast of Tokyo Bay, velocity responses of larger than 100 cm/s were observed for a period of 2 to 3.5 seconds. To understand S-wave velocity profiles, therefore, we carried out array microtremor observations at 6 sites in this area. As a result, thick soft-soil deposits with S-wave velocity of Vs 150 m/s and Vs 400 m/s were estimated in the Tokyo Bay of Shinagawa to Kawasaki. |
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