Fig. 14

Comparison of estimated phase velocities for different shapes of triangle arrays (synthetic data). It is noted that the vertical axes are on a logarithmic scale to emphasize the differences in the estimated values. In the case where the series of Eq. (7) is terminated at \(n=2\), the estimated phase velocities are identical and agree with the target except for the most-flattened triangle (R1-R6-R7). In the case where the series is terminated at \(n=1\), the flatter the array shape, the more different the estimated phase velocity is from the target