In this paper we describe a short-period seismic array, named ARF, installed since August 2010 under the town of Pozzuoli, in the center of the Campi Flegrei caldera (Italy). The aim of the ARF array is the detection of volcanic tremor, whenever should it show up. One year of continuous data have been analyzed with array techniques tuned to detect coherent low-frequency signals, possibly related to volcanic activity. We describe the main features of seismic noise, its relationship with human activity, and compare the signals recorded at 16 m depth with those recorded at surface. Detailed analysis of some local events, including volcano-tectonic earthquakes, artificial explosions, and artificial tremor-like signals, are used to check the array performances. These events provide important insight for establishing the amplitude threshold and frequency range of detectable tremor-like signals. The results of array analysis suggest that the ARF array is suitable to detect coherent signals with root mean square (rms) > 1 micron/s in the 1–5 Hz frequency band.
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|Titolo:||A seismic array in the town of Pozzuoli in Campi Flegrei (Italy)|
|Data di pubblicazione:||2012|
|Appare nelle tipologie:||1.1 Articolo in rivista|