| 講演要旨(和文) | | 特別セッション。地震災害軽減に貢献する物理探査：地震防災分野に対しては，地震波トモグラフィ，微動探査，反射法などの弾性波探査が主として適用されている．これらは，想定される地震動の評価，基盤面の累積変位，首都圏直下のプレート境界面の深度の推定など，地震防災に貢献する重要な情報を提供することができる．一方，兵庫県南部地震時に活動した野島断層，東北太平洋沖地震の１ヵ月後に発生した浜通り地震時に活動した井戸沢・湯ノ岳断層などにおいて，様々な研究機関により電気・電磁探査法が適用され，断層周辺の地質構造を調査した事例が数多くある．しかし，地震探査に比べると地震防災にどう貢献しているのかが不明瞭と思われる．本報では，これまで筆者が行ってきた様々な活断層地点での適用事例に基づき，電気・電磁探査法が地震防災分野にどう貢献できるかについて考察する． |
|
|
| | 講演要旨(英文) | | Special session: In order to apply geophysical explorations to earthquake disaster prevention, we applied mainly seismic explorations like, seismic tomography, microtremor exploration, and seismic reflection methods. These methods enable us to carry out important functions such as evaluation of assumed earthquake ground motion, cumulative displacement of bedrocks caused by activities of fault, and estimations of depth to the plate boundary in capital regions. On the other hand, electrical and electromagnetic methods have been performed by various research organizations to survey geological structures at the Nojima fault which was activated after the South Hyogo earthquake, and the Itozawa fault and Yunodake fault which were activated one month after the Northeastern Pacific offing earthquake. However, it is thought that contributions to earthquake disaster prevention using the electrical and electromagnetic methods are indistinct in comparison with the seismic explorations. In this report, the application of electrical and electromagnetic methods to earthquake disaster prevention based on the author's case studies at the active fault sites is considered. |
|
|
|
| |
|