Abstract
We report the values of R = d ln( Vs)/d ln( Vp) due to water as a function of pressure for Mg 2SiO 4 olivine, wadsleyite, ringwoodite. The results show that ringwoodite has significantly lower R than olivine and wadsleyite; due to the reason that bulk modulus of ringwoodite is more sensitive to water than shear modulus. R of ringwoodite decreases with pressure while R of olivine and wadsleyite increases with pressure. R reported here was calculated using theoretical method derived equation of states. R due to temperature is also reported as a comparison of R due to water. The local value of R in the upper mantle and transition zone can discriminate between lateral variations of water content and temperature as the origin of lateral seismic variations.
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