A study of tilt change recorded from July to October 2006 at the Phlegraean Fields (Naples, Italy)

C. Ricco, I. Aquino, S. E. Borgstrom, C. Del Gaudio

Abstract


The tiltmetric dataset of Phlegraean Fields area showed a discrete correlation with the volcanic dynamics, suggesting
that tiltmetric monitoring is important for the surveillance of active volcanic areas. Tilt data recorded in 2006 at 2 stations
belonging to the monitoring network of the Osservatorio Vesuviano (INGV, National Institute for Geophysics
and Volcanology, Italy) in the Phlegraean Fields are discussed in this paper. The acquired signals have shown a strong
tiltmetric inversion that took place from the end of July 2006. After correcting tilt variations to eliminate the influence
of temperature (influencing 90% of the signal at OLB station, hereafter OLB) a significant value of the tilt still remains.
This change is related to a local inflation episode lasting 3 months, during an unrest phase that started 2 years
before. It is interesting to note that tilt amplitude is much greater at OLB than the slope of the displacement field predicted
by the theoretical inflation models, but data show that this field is not homogeneous and in some areas very tilted.
Moreover, in the last days before the end of tilt inversion, a low energy seismic swarm happened at about 1 km of
distance from the tiltmetric station by hundreds of VT (Volcano-Tectonics) and LP (Long-Period) events.

Keywords


monitoring;tilt network;ground deformation;spectral analysis;decorrelation methodology

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References


DOI: https://doi.org/10.4401/ag-3059
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X