Publication Date:
2023-05-30
Description:
This work is devoted to the analysis of the background seismic signal acquired in volcanic areas, specifically Campi Flegrei caldera (Italy), with the main aim to extract the statistical characteristics of the several transients and persistent signals occurring in that area. Indeed, any continuous seismic acquisition is not a trivial superposition of several seismic contributions coming from different internal or external sources. In particular, looking at the crisis of 2006 at Campi Flegrei, apart from the background hydrothermal noise, the meteo-marine contributions, and the anthropogenic noise, several Volcano-Tectonic and Long-Period events were recorded tracking the unrest phase. The identification of the statistical characteristics, in terms of high-order statistics and spectral contents, of any of these signals is crucial in the modeling and in the recognition. Here adopt the FIF analysis which is able to extract detailed information about the wavefield. We are able to identify the main characteristics of volcanic and non-volcanic signals, whose characteristics are general and not related to the investigated volcano. Moreover, this technique can well track any change in the dynamics of the caldera, revealing multi-scale patterns that are deeply changing when reaching the unrest phase. This provides a strong indication of the dynamic state of a volcano to be used in the monitoring processes.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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