Abstract
A model which combines the plate thickening model and the preferred orientation olivine model is proposed to interpret P-wave velocity azimuthal anisotropy in the lithosphere. Two layers of anisotropy are used to interpret the low velocity zone structure introduced by Asada and Shimamura in the Northwestern Pacific as a result of the azimuthal difference of the maximum P-wave velocity axes. We also suggested that the rate of anisotropy changes with depth.
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