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From the wave speed's linear dependence on temperature and pressure and from the sample's calculated density, we derived expressions for bulk, shear, and compressional wave moduli and Poisson's ratio from \u221220 to \u22125\u00b0C and 22.4 to 32.8 MPa for ice Ih, \u221220 to 15\u00b0C and 30.5 to 97.7 MPa for sI methane hydrate, and \u221220 to 10\u00b0C and 30.5 to 91.6 MPa for sII methane\u2010ethane hydrate. All three materials had comparable P and S wave speeds and decreasing shear wave speeds with increasing applied pressure. Each material also showed evidence of rapid intergranular bonding, with a corresponding increase in wave speed, in response to pauses in sample deformation. There were also key differences. Resistance to uniaxial compaction, indicated by the pressure required to compact initially porous samples, was significantly lower for ice Ih than for either hydrate. The ice Ih shear modulus decreased with increasing pressure, in contrast to the increase measured in both hydrates.<\/jats:p>","DOI":"10.1029\/2008jb006132","type":"journal-article","created":{"date-parts":[[2009,2,26]],"date-time":"2009-02-26T21:05:39Z","timestamp":1235682339000},"source":"Crossref","is-referenced-by-count":83,"title":["Elastic wave speeds and moduli in polycrystalline ice Ih, sI methane hydrate, and sII methane\u2010ethane hydrate"],"prefix":"10.1029","volume":"114","author":[{"given":"M. B.","family":"Helgerud","sequence":"first","affiliation":[{"name":"Department of Geophysics Stanford University  Stanford California USA"},{"name":"U.S. Geological Survey  Menlo Park California USA"}]},{"given":"W. F.","family":"Waite","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey  Woods Hole Massachusetts USA"}]},{"given":"S. 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