| 講演要旨(和文) | | 横須賀市における三浦半島北断層群の詳細な分布と地下構造形態を明らかにすることを目的として精密重力探査を実施した．三浦半島北断層群は衣笠断層・北武断層・武山断層によって構成される活断層群であり，地質や構造形態を知るための様々な調査が行われてきた．本研究では，神奈川県(2001)の反射法地震探査測線において重力探査を実施し密度構造解解析を行うことで，詳細な地下構造形態を知ることができると考え調査を行なった．解析にはフォワード法を用い，神奈川県(2001)の反射法地震探査の結果を初期条件とした．結果として，北武断層や衣笠断層の下部における向斜・背斜構造や，北武派生断層の下部における基盤の落差を伴う構造を推定できた． |
|
|
| | 講演要旨(英文) | | We conducted a high resolution gravity survey to reveal the subsurface structures of Miura Peninsula Active Fault Zone in the Yokosuka City. The fault zone, that constitute of the Kinugasa fault, the Kitatake fault and the Takeyama fault, have been a lot of investigation for reveal tectonics and geological feature. We can expect to reveal the detailed subsurface structure of the fault zone by conducting a gravity survey include the seismic reflection survey line in Yokosuka City by Kanagawa Pref. (2001). In this paper, 2-D with a reference density structure model, based on interpretation of basement layer by Kanagawa Pref.(2001), was analyzed by using a forward modeling method. As a result, we infer the existence of fold structures under the Kitatake fault and the Takeyama fault. In addition, we infer the basement structure subside under the splay fault of the Kitatake fault. |
|
|
|
| |
|