2025.06.20
IODP3 Exp. 502E: Extended Monitoring and Resurveying of Japan Trench Borehole Observatories
航海概要
| ステータス | 航海準備中 （本航海はEngineering Expeditionであり、Science Teamの募集はありません。） |
| 航海番号 | 502E |
| 航海名称 | Extended Monitoring and Resurveying of Japan Trench Borehole Observatories |
| 航海予定期間 | 研究航海（Offshore Operations）：2025年10月18日〜30日（予定） |
| 掘削船 | 地球深部探査船「ちきゅう」 |
| 乗船/下船地 | Shimizu, Japan / Sendai, Japan |
| 航海概要・科学目的 | Engineering expedition IODP3 Expedition 502E aims to test key hypotheses about the long-term hydrogeologic and mechanical evolution of the Japan Trench megathrust by redeploying temperature sensor strings in observatory Holes C0019D and C0019Q and conducting surveys of downhole deformation. Specifically, we hypothesize that permeability within the fault damage zone remains elevated relative to the plate boundary fault core and that hydrogeologic properties continue to evolve due to healing processes. Redeployed temperature sensors will allow us to assess changes over time by capturing thermal anomalies associated with fluid migration and hydrogeologic transients. We further hypothesize that horizontal fluid flow past the borehole varies with depth, reflecting structural heterogeneities within the fault zone. A Thermal Response Test will quantify background flow rates past the borehole casing, providing direct constraints on lateral fluid migration and its role in pressure redistribution. These data will be integrated with geochemical observations and temperature time-series analysis to assess the role of fluids in modulating fault strength. 詳細は、以下のIODP3のウェブサイトをご参照ください。 IODP3 Expedition 502E Information Sheet |
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