Tidal and hydrological periodicities of seismicity reveal new risk scenarios at Campi Flegrei caldera.

ABSTRACT: The volcano-tectonic seismicity occurring at Campi Flegrei caldera during its present unrest phase, started in 2005, is distributed into time-clustered events emerging from a background composed of earthquakes with higher inter-arrival times. Here, we show that clustered seismicity is cyclically recurrent at time scales from semidiurnal to annual, matching tidal and hydrological periodicities. These results suggest that volcano-tectonic seismicity at Campi Flegrei caldera is driven by both variations in the deep magmatic feeding system and exogenous phenomena, as rainfall or global inflation/deflation cycles of the Earth's crust, controlled by the lunisolar interaction. Consequently, the role of exogenous triggers in the evolution of the present unrest phase should be properly considered i

SUBMITTER: Petrosino S 

PROVIDER: S-EPMC6138717 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature