| 講演要旨(和文) | | 2011年4月11日の福島県浜通りの地震で出現した塩ノ平の地震断層に対して，S波反射法，S波屈折法，P波屈折法，表面波探査による極浅部探査を実施した．S波速度0.7km/s以下の低速度ゾーンは，断層の西側で厚く東側で薄い．強い反射面が認められ，堆積層と基盤の境界と考えられる．この反射面は，断層の西側で深く平坦で連続性が良く，断層の東側で浅く凸凹があり，断層付近では階段状を呈する． |
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| | 講演要旨(英文) | | Very shallow seismic surveys were applied to the Shionohira surface earthquake fault which was appeared at the 2011 April 11th Hamadori earthquake in Fukushima Prefecture. They are S wave refraction, S wave reflection, P wave refraction and Surface wave methods. Low S wave velocity zone (under 0.7km/s) is thick to the west of the surface earthquake fault and thin to the east. A strong reflector is recognized and it is considered as a boundary between sediments and basement rock. It is deep, flat and continuous to the west of the fault, shallow and uneven to the east and like steps near the fault. |
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