A. Caputo

Seismological Insights on the Shallow Magma System

We present an overview of the volcanic seismicity recorded at Stromboli from January to September 2003. The data set starts a few weeks after the onset of the eruption and covers most of the effusive phase and the subsequent recovery of the explosive activity. The most important variations occurred between May and July coinciding with the waning of the lava flow and the reappearance of Strombolian activity at the summit craters. All the parameters indicate that the shallow magmatic system has not undergone permanent changes during this period. The only significant variation related to the shallow conduit is the increase in volcanic tremor amplitude and the change in the spectral content of long-period events during the transition between effusive and explosive activity. A slight increase in the very long period (VLP) events source elevation seems to mark the rise of the magma at the end of the effusive phase. The variations in the VLP events occurrence rate are more likely to be attributed to changes in the gas flow rate and the bubble coalescence mechanism, therefore, to a deeper portion of the magmatic system. The 5 April paroxysm is associated only with a small increase of the activity in the following days.

A wireless network as support to the monitoring of Campi Flegrei volcano in Italy

The main purpose of this work is the design and implementation of an integrated wireless network as support to the multiparametric geophysical monitoring network of the Campi Flegrei volcanic area, in view of the increased need for seismic monitoring, which is a consequence of the drilling of an exploration well for scientific purposes. The goal is to increase the performance of the transmission system in terms of speed, real-time availability and reliability, given the high seismic risk and hazard associated with the experiment. The drilling is part of the international research project called “Campi Flegrei Deep Drilling Project” (CFDDP). For this purpose, in the first half of 2012, it was necessary to enhance the multiparametric monitoring network of Campi Flegrei, creating a subnet of seismic sensors, with limited geographical extension, but concentrated around the area of the well realization. The data acquisition from the monitoring center “Osservatorio Vesuviano”, section of Naples of the INGV, is guaranteed by a system of radio links in the 5 GHz band, due to the high interference in the typical band 802.11 and the highly urbanized area of interest. The subnet has shown a good cost/benefit ratio as regards the transmission, and it has proved to be useful for the monitoring purposes in order to detect in real time possible anomalies related to the drilling.