Abstract
We report on compressional- and shear-wave-speed measurements made on compacted polycrystalline sI methane and sII methaneethane hydrate. The gas hydrate samples are synthesized directly in the measurement apparatus by warming granulated ice to 17°C in the presence of a clathrate-forming gas at high pressure (methane for sI, 90.2% methane, 9.8% ethane for sII). Porosity is eliminated after hydrate synthesis by compacting the sample in the synthesis pressure vessel between a hydraulic ram and a fixed end-plug, both containing shear-wave transducers. Wave-speed measurements are made between 20 and 15°C and 0 to 105 MPa applied piston pressure. PACS No.: 61.60Lj
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