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Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

From: Reconstruction of a 2D seismic wavefield by seismic gradiometry

Fig. 2

Snapshots of the simulated seismic wavefield used as a reference solution of the numerical test of the seismic gradiometry (see text) at elapsed times of (a) t = 50, (b) t = 100, (c) t = 200 s, and (d) t = 300 s, measured from the start of the earthquake. Red and green colors overlaid on the topographic map show scaled divergence and the absolute value of the rotation vector of the velocity of ground motion at the ground surface or on the seafloor. The local Cartesian horizontal coordinates (x, y) used in the simulation and the geographical directions (N, E) are shown in a. An MP4-formatted movie of the time-dependent wavefield is included in Additional file 1: Movie S1)

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