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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-67
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 06 Jul 2018

Regular paper | 06 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Electromagnetic field observations by the DEMETER satellite in connection with the 2009 L’Aquila earthquake

Igor Bertello1, Mirko Piersanti2,3, Maurizio Candidi1, Piero Diego1, and Pietro Ubertini1 Igor Bertello et al.
  • 1Istituto di Astrofisica e Planetologia Spaziali, Roma, Italy
  • 2University of Rome Tor - Vergata, Rome, Italy
  • 3Consorzio Area di Ricerca in Astrofisica, L’Aquila, Italy

Abstract. To define a background in the electromagnetic emissions above seismic regions, it is necessary to define the statistical distribution of the wave energy in absence of seismic activity and any other anomalous input (e.g. solar forcing). This paper presents a completely new method to determine both the environmental and instrumental background applied to the entire DEMETER satellite electric and magnetic field data over L’Aquila. Our technique is based on a new data analysis tool called ALIF (Adaptive Local Iterative Filtering, [Cicone et al., 2016 and 2017; Piersanti et al., 2017]). To evaluate the instrumental noise, we performed a multiscale statistical analysis, in which the instantaneous relative energy (ϵrel), kurtosis and Shannon entropy was calculated. To estimate the environmental noise, a background map, divided into 1°×1° latitude/longitude cells, of the averaged relative energy (ϵrel) has been constructed, taking into account the geomagnetic activity conditions, the presence of seismic activity and the local time sector of the satellite orbit. Any distinct signal different (over a certain threshold) from both the instrumental and environmental backgrounds will be considered as a case event to be investigated. Interestingly, on April 4, 2009, when DEMETER flew exactly over L’Aquila at UT=20:29, an anomalous signal was observed at 333Hz on both the electric and magnetic field data, whose characteristics seem to be related to pre-seismic activity.

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This paper presents a completely new method, based on new data analysis technique (ALIF) to determine both the environmental and instrumental background applied to the entire DEMETER satellite electric and magnetic field data over L’Aquila seismic region. Interestingly, on April 4, 2009, when DEMETER flew exactly over L’Aquila at UT = 20:29, an anomalous signal was observed at 333 Hz on both the electric and magnetic field data, whose characteristics seem to be related to pre-seismic activity.
This paper presents a completely new method, based on new data analysis technique (ALIF) to...
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