Temporal pattern in Corinth rift seismicity revealed by visibility graph analysis

The investigation of complex time series properties through graph theoretical tools was greatly benefited from the recently developed method of visibility graph (VG) which acts as a hub between nonlinear dynamics, graph theory and time series analysis. In this work, earthquake time series, a representative example of a complex system, was studied by using VG method. The examined time series extracted from the Corinth rift seismic catalogue. By using a sliding window approach the temporal evolution of exponent γ of the degree distribution was studied. It was found that the time period of the most significant event (seismic swarm after major earthquake) in the examined seismic catalogue coincides with the time period where the exponent γ presents its minimum.