Fig. 2: Deformation, Seismic velocity changes and hydrological forcing. | Nature Communications

Fig. 2: Deformation, Seismic velocity changes and hydrological forcing.

From: Non-linear elasticity, earthquake triggering and seasonal hydrological forcing along the Irpinia fault, Southern Italy

Fig. 2

a, b Maps of distributed hydrological strain with calculated/observed GPS displacements. The complete, continuous strain evolution is shown in Supplementary Movie 1. The two frames display opposite conditions of groundwater recharge in karst aquifers (shown as green lines) and opposite dilatational patterns. Red, green, and blue circles in (a) indicate data points where series of dilatational strain, velocity variations, and spring discharge (shown in (c)) have been respectively calculated. c Time series of dilatational strain (red) calculated at MCRV compared with the co-located velocity variations (green), earthquake rate (black), and Caposele spring discharge (blue); d frequency of the azimuth of compressional axis (left) and extensional axis (right) coupled with the sign of the synchronized scalar of the strain (top panel) and velocity changes (bottom panel).

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