| 講演要旨(和文) | | 地熱資源の多くが賦存する山岳地の弾性波探査では，直線的な2次元測線や，直交配置による面的な3次元測線の設定は困難という課題があるが，本研究では測線の屈曲を利用して，多線パラレル配置により3次元記録に準ずる記録を取得する方式（準3次元弾性波探査法）に注目している．本講演では平成29年に宮城県・鬼首地熱地域において実施された準3次元弾性波探査法の実証試験の概要を紹介する． |
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| | 講演要旨(英文) | | We conducted a quasi-3D seismic survey at the Onikobe geothermal field in 2017 to confirm its effectiveness in mountainous areas where most geothermal resources are reserved. Survey design is crucial in such areas because a limited number of roads that can be used for seismic lines are available. To obtain 3D seismic volume, we used four types of sources and two types of recorders according to surface conditions so that the survey layout was optimized. The effort allowed us to obtain 3D seismic volume in deep part which included potential target zones. Applying geometrical attribute analysis and integrating with other geophysical models highlighted potential fracture zones in the prospective area. The results showed consistency with existing concepts and added new insights in the geothermal reservoir. |
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