| 講演要旨(和文) | | 石狩低地南部，苫小牧市，安平町，千歳市付近で，測線長19.2�劼�8.8�劼糧深曜｜録銘戯此と深預�線とその延長域で重力探査を実施した．得られた反射断面には幾つかの褶曲や撓曲が見られ，既存調査との対比等により，低地部における褶曲の延長や分岐が考察された．ブーゲー異常は，東下がりの全体トレンドは東に緩く傾いた基盤形状を示唆し，小さい異常は反射断面に見られる褶曲構造と一致する． |
|
|
| | 講演要旨(英文) | | Seismic reflection surveys and gravity surveys were conducted along 19km and 8km long lines in the eastern boundary zone of Ishikari lowland, Hokkaido, to reveal the subsurface structure. Several folds and flexures are perceived in each seismic section. Folds are traced, tied and branched among the two new seismic sections and the past seismic sections. The Bouguer anomalies decrease eastward along each line. It indicates eastward dipping of the pre-Tertiary basement and smaller anomalies correspond to folds seen in the seismic sections. |
|
|
|
| |
|