Fig. 3

Elapsed time versus distance plots of the seismicity in the areas shown in Fig. 2. Gray crosses denote the points of distance and elapsed time measured from the spatial origin determined by a grid search and the origin time for the first event. Orange circles denote the 90th percentile distance points for bins of 20 events. Solid lines represent the best-fit synthetic diffusion curve following \(r=\sqrt{4\pi Dt}\), where r is the distance [km], t is elapsed time [days], and D is diffusivity [m²/s]. Dashed lines indicate theoretical diffusion curves with \(D\pm 2\sigma\)