Fig. 9
From: Reconstruction of a 2D seismic wavefield by seismic gradiometry
Divergence and rotation estimated by seismic gradiometry for elapsed times of (a) t = 60 s, (b) t = 120 s, and (c) t = 300 s for the 25–50 s period band. Each panel shows the observed vertical-component displacement (the same as in Fig. 6) (left), divergence (center), and the vertical component of the rotation vector (right). An MP4-formatted movie of the time-dependent wavefield is included in Additional file 4: Movie S4