We studied the subsoil structure of the Campi Flegrei area using both spectral ratios and array techniques (f-k and MSPAC) applied to seismic noise recorded by three different array. By means of joint inversion of dispersion curve and spectral ratio we obtained a Vs model, that is in a good agreement with the stratigraphic information available in the area. In areas such as Campi Flegrei the definition of the velocity model is a crucial issue to characterize the physical parameters of the medium

The Solfatara volcano (Italy), is monitored by a thermal infrared camera ground network handled by INGV. The dataset processed in this work consists of daily maximum temperatures time-series from 25 April 2014 to 31 May 2019. After a pre-processing, PSD's were calculated, filtering in [15–120] day band, to check if characteristic periodicities exist. Most of the periodicities are ascribable to ambient factors, while 18.16 and 88.71 days have a possible endogenous origin.

We present a detailed analysis of the atypical low frequency seismicity occurred at Mt. Vesuvius in 2003-2018. The different decay patterns of the spectra, the existence of families as well as single events, the wide seismogenic volume, indicate that these events are caused by distinct source mechanisms: slow brittle failure in dry rocks and resonance of fluid-filled cracks. On these basis, we classified the earthquakes as Low Frequency (LF) and Long Period (LP).