Olivine Fabrics in the Oceanic Lithosphere Constrained by <i>Pn</i> Azimuthal Anisotropy

We constrain olivine fabrics in the oceanic lithosphere using active and passive seismic observations of Pn azimuthal anisotropy. first analyze active-source data derived from a broadband ocean bottom seismometer array that was deployed Northwestern Pacific. infer dependence velocity, including 2ϕ 4ϕ terms sinusoidal functions, where ϕ is back azimuth. observe skewed with large peak-to-peak amplitude about 12%. Similar features are observed an independent dataset teleseismic waves. direction crystallographic axes to explain identify A-type slightly dipping a-axis tilting b-axis being compatible our observations. In contrast, we find D-type any cannot Secondary deformation recrystallization older Pacific may be responsible for this strong complex anisotropy study region.