京都大学 · 地球惑星科学
Koike教授の研究室では、地殻内部のガス移動や応力状態と放射性ガス（特にルビジウム-222）の挙動の関係を、地盤の微小変形や地震活動と結びつけて解明しています。主に西日本における活断層周辺の土壌ガス中222Rn濃度の変動を、地震エネルギーの累積と関連づけて解析しており、地殻応力の変化がガス移動に与える影響をDarcyの法則に基づいて解明しています。また、地熱資源の評価においても、地中温度分布と地表面温度の統合的解析を用いた3次元温度モデル構築にも取り組んでいます。
Figures are computed from collected data and may differ slightly.
This study demonstrates how the radon-222 (222Rn) concentration of soil gas at an active fault is sensitive to cumulative recent seismicity by examining seven active faults in western Japan. The 222Rn concentration was found to correlate well with the total earthquake energy within a 100-km radius of each fault. This phenomenon can probably be ascribed to the increase of pore pressure around the source depth of 222Rn in shallow soil caused by frequently induced strain. This increase in pore pres
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