Fig. 9
From: Estimation of phase velocity using array observation of microtremors with arbitrary shape
Estimated values of unknown parameters for equilateral and most-flattened triangles (synthetic data). The top left panel shows the phase velocity and the other panels show the other unknown parameters, such as \(X_n\) and \(Y_n\) (\(n=1,2\)). The solid gray line is the target dispersion curve. The orange points show the results which are used in the series expansions of Eq. (7) until \(n=2\), and the blue points show those until \(n=1\). The points show the averaged values with error bars of the range of ± one standard deviation