断層運動に伴うガスハイドレート下面深度の変化に及ぼす潜熱の影響 (邦文)

概要

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BSRs, often observed at the Nankai accretionary complex, are considered to coincide with the base of the methane gas hydrate stability field (BGHS). The absence of BSR was discovered along the deep-tow multi-channel survey track, which can result because the insitu P-T condition is still in a transient state after fault activity. We conducted a two-dimensional numerical simulation of the thermal regime after faulting to simulate the time variation of BGHS depth. The latent heat due to formation/dissociation of gas hydrate has a significant effect on the thermal regime. The time constant for re-equilibration of the phase transition depth is ca 10 to several tens of years, which is longer by one order of magnitude for the case with latent heat considered than for the case with latent heat ignored.
東京大学の論文