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First-arrival traveltimes from a multi-offset vertical seismic profile (VSP) were used to estimate velocity anisotropy in the presence of a vertical velocity gradient. A numerical model consisting of two layers with vertical velocity gradients of 3.1 and 1.2 s −1 , respectively, and global anisotropy parameters of ε=0.12±0.02 and δ=0.30±0.06 yielded first-arrival traveltimes that matched the...
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