Fig. 5: Spatial coherence of seismic noise over time.
From: Seismic signature of an extreme hydro-meteorological event in Italy
a Time history of the median amplitude of the seismic signal averaged over the stations and corresponding standard deviation (log scale). The vertical dotted lines mark the time frames at which the spatial distribution of the seismic amplitude is displayed in the following subpanels. The blue and brown shaded areas broadly mark respectively the time interval with intense rain and with the largest seismic amplitude. b–e Spatial distribution of the amplitude of the seismic signals (hf, z component) at four timeframes. Triangles mark the station positions and colors scale with the signal amplitude (in m/s - log scale). Isolines display the amplitude of the seismic signal interpolated over the whole target area (see methods for details). Red circles show the position of hydrometers, while black stars are located at the position of strongly damaged villages or towns. The four blue irregular lines show the rivers (from north to south) Metauro, Misa, Esino, Potenza.
