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Original Research ARTICLE

Front. Earth Sci. | doi: 10.3389/feart.2020.536332

Electric and magnetic recordings by Chieti CIEN Station during the intense 2016–2017 seismic swarms in Central Italy Provisionally accepted The final, formatted version of the article will be published soon. Notify me

  • 1Other, Italy
  • 2University of Studies G. d'Annunzio Chieti and Pescara, Italy

We monitored electric and magnetic fields synchronously and continuously in an Italian area prone to
moderate-to-high magnitude seismic activity. Identifying and monitoring of potential precursors may
contribute to risk mitigation. A decade after the Central Italy Electromagnetic Network started, nine
strong shakes with magnitudes between 5.0 and 6.6 occurred in Central Italy between August 2016 and
January 2017. The events produced a fault offset of up to 2.8 m along a NNW–SSE normal fault
system, 75 km long and located NW of the fault system, which generated the destructive L’Aquila 2009
earthquake sequence. This paper describes the electric and magnetic variations in the extremely low
frequency band recorded at the Chieti Station of the network. Meteorological and geomagnetic data
were compared to the recordings of these electric and magnetic activities by statistical correlations. Werecorded several abrupt increases in electric and magnetic activities not simultaneous to the main
seismic events and presumptively related to them. Electrical signals consist in discrete electric field
oscillations between 50 and 200 Hz, with time lapses lasting between 3 and 45 minutes. In addition,
magnetic signals consisting of magnetic field pulses with time lapses greater than 10 ms were recorded
in the same time interval. Similar signals occurred during the 2009 L'Aquila, Central Italy, sequence.
Days before each strong earthquake, both electric and magnetic phenomena increased in intensity and
number. Two physical models are proposed to describe and interpret electric and magnetic signal
events. A number of hypotheses about the origin of recorded electric and magnetic signals may fit
coherently with electromagnetic theory and are discussed in the light of a consistent dataset.

Keywords: earthquake forecasting, electrical oscillations, Magnetic pulses, electric properties, Electromagnetic models

Received: 19 Feb 2020; Accepted: 15 Sep 2020.

Copyright: © 2020 FIDANI, Orsini, Iezzi, Vicentini and STOPPA. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: PhD. CRISTIANO FIDANI, Other, San Procolo, Italy, c.fidani@virgilio.it