Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)

摘要: [1] Long continuous seismic data recorded at five broadband stations during 2006 Campi Flegrei caldera have been analyzed. Introducing a coarse-grained method, we evaluate the time evolution of amplitude and polarization noise in frequency band common to long-period events. The series are modulated on tidal scales: root-mean square is basically dominated by solar contribution, while azimuth vector shows lunar diurnal semidiurnal constituents. In addition, find that events azimuths polarized toward specific area, suggesting these persistent oscillations can be induced activity shallow geothermal reservoir.