As the final goal of visualization of the dissociation front of methane hydrate in the sand layer, we are proceeding with a program of P-wave tomography monitoring. We describe a monitoring of the elastic wave propagation in the methane hydrate-bearing sand artificially formed in a giant pressure cell. First, we conducted a preliminary experiment to check the performance of the measurement system. In the stage of the methane hydrate generation, the P-wave velocity was estimated about 3000 m/s. In the dissociation stage, the travel time delay was not observed, but also the signal decreasing was observed with the dissociation.

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