Fig. 4From: Estimation of phase velocity using array observation of microtremors with arbitrary shapeHistograms of \(\xi _n\) and \(\zeta _n\) (\(n=1,2\)) and Gaussian distributions approximated by Eqs. (15) to (18) as drawn by thick gray lines. The parameters are set at \(L=100\), \(\phi _0=\pi /6\), and \(\Delta \phi =\pi /4\). Notations \(X_n\) and \(Y_n\) (\(n=1,2\)) mean \(\xi _n(\phi _0;\Delta \phi )\) and \(\zeta _n(\phi _0;\Delta \phi )\), respectivelyBack to article page