EGU21-10939
https://doi.org/10.5194/egusphere-egu21-10939
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ionosonde and satellite data analysis in relation to the M5.9 April 6, 2009 L’Aquila (Italy) earthquake

Dario Sabbagh1, Loredana Perrone1, Angelo De Santis1, Saioa A. Campuzano2, Gianfranco Cianchini1, Dedalo Marchetti1,3, Martina Orlando1, Alessandro Piscini1, and Maurizio Soldani1
Dario Sabbagh et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy (dario.sabbagh@ingv.it)
  • 2Instituto de Geociencias IGEO (CSIC-UCM), Ciudad Universitaria, 28040, Madrid, Spain
  • 3College of Instrumentation and Electrical Engineering, Jilin University, 130061, Changchun, China

A combined ground-satellite study of the ionospheric response to the preparation phase of the M5.9 crustal earthquake occurred in L’Aquila (Italy) on April 6, 2009 is here presented. Ionospheric anomalies based on ionosonde observations of the altitude and blanketing frequency of the E-sporadic (Es) layer (h’Es and fbEs, respectively) and of the critical frequency foF2 of the F2 layer are considered. For our analysis we make use of data from the Rome ionospheric observatory, located 90 km away from the earthquake epicentre, looking for anomalies up to a couple of months before the mainshock occurrence. Specifically, the variations for 2-3 hours of these parameters with respect to the past 27-day hourly running median are studied in relation to: (a) the ongoing geomagnetic activity during and several hours before the detection of the anomalies, as described by the values of the global ap and the auroral AE geomagnetic indices; (b) the earlier-obtained empirical relations for the seismic-ionospheric disturbances relating the earthquake magnitude with the epicentral distance and the anticipation time of the found anomalies. In addition, ionospheric anomalies in the electron density measured over the earthquake preparation region by the CHAllenging Minisatellite Payload (CHAMP) satellite at altitudes of about 320 km are studied in relation to the ionosonde-derived anomalies during the whole period preceding the mainshock occurrence.

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