THE MEMORY OF THE SEISMIC NOISE IN THE UNREST OF LAS CAÑADAS CALDERA, TENERIFE, SPAIN.

The origin of the continuous seismic noise recorded during the last few years in the volcanic island of Tenerife (Canary Islands, Spain) is under debate, due to the important implications in terms of hazard. The seismic noise is strongly affected by anthropogenic contamination, but previous work has recognized the existence of a bidirectional relationship between this noise and the occurrence of local tectonic events. This suggests that the seismic noise is highly informative and could be the source of potential precursors highlighting variations in the volcanic activity. The search for such precursors however needs the presence of persistence in the time series, which reflects a memory of the underlying dynamical system. In this paper, the variogram tool is used to characterize and quantify this persistence.