Robust analysis for the characterization of the Seismo-Electromagnetic Signals observed in Southern Italy

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Gerardo Romano
Marianna Balasco
Agata Siniscalchi
Anna Eliana Pastoressa
Vincenzo Lapenna

Abstract

Seismo−electromagnetic signals (SES) are anomalous electromagnetic signals generated as a response to the propagation of a mechan− ical perturbation within the subsoil. Fluid presence plays a key role in determining SES generation and characteristics, therefore SES study could be useful for subsoil characterization. In a more general framework, it can give insight about the role of fluids in the earthquake generation and seismic wave propagation.

A systematic study on SES and the related data analysis techniques is fundamental to define the characteristics of these signals which are superimposed to the natural electromagnetic field induced by the external variable magnetic field. To this aim, the Pollino seismic swarm was a great opportunity because continuous MagnetoTelluric (MT) data were recorded in a period in which numerous seismic events of various magnitudes occurred. During the observational period, SES have also been recorded in correspondence to earthquakes far from the MT stations over 800 km.

In this paper, we present a procedure aimed to improve the SES detectability and gather as much information as possible on these sig− nals. The procedure is especially tuned for the analysis of MT time series and is based on the application of the Continuous Wavelet Trans− form (CWT) and frequency filters.
As will be shown, the operational scheme allows minimizing the background variability of the MT signal facilitating SES detection and the characterization in terms of amplitude and duration.

Article Details

How to Cite
Romano, G., Balasco, M., Siniscalchi, A., Pastoressa, A. E. and Lapenna, V. (2019) “Robust analysis for the characterization of the Seismo-Electromagnetic Signals observed in Southern Italy”, Annals of Geophysics, 62(4), p. GM450. doi: 10.4401/ag-7811.
Section
From the Sun to the Earth’s interior
Author Biographies

Gerardo Romano, Università degli studi di Bari "Aldo Moro"

Dipartimento di Scienze della Terra e Geoambientali, Researcher

Marianna Balasco, Consiglio Nazionale delle Ricerche

Istituto di Metodologie per l Analisi Ambientale, Researcher

Agata Siniscalchi, Università degli studi di Bari "Aldo Moro"

Dipartimento di Scienze della Terra e Geoambientali, Associated Professor

Anna Eliana Pastoressa, Università degli studi di Bari "Aldo Moro"

Dipartimento di Scienze della Terra e Geoambientali, PhD Student

Vincenzo Lapenna, Consiglio Nazionale delle Ricerche

Istituto di Metodologie per l Analisi Ambientale