Articles | Volume 11, issue 4
Nat. Hazards Earth Syst. Sci., 11, 1019–1024, 2011

Special issue: Progress in research on earthquake precursors

Nat. Hazards Earth Syst. Sci., 11, 1019–1024, 2011

Research article 01 Apr 2011

Research article | 01 Apr 2011

Investigation of TEC and VLF space measurements associated to L'Aquila (Italy) earthquakes

G. Stangl1, M. Y. Boudjada2, P. F. Biagi3, S. Krauss2, A. Maier2, K. Schwingenschuh2, E. Al-Haddad4, M. Parrot5, and W. Voller2 G. Stangl et al.
  • 1Federal Office of Metrology and Surveying, Vienna, Austria
  • 2Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 3Department of Physics, University of Bari, Bari, Italy
  • 4Software Engineering, Campus 02, University of Applied Sciences, Graz, Austria
  • 5Laboratoire de Physique et Chimie de l'Environnement, Orléans, France

Abstract. In this study, we report on Total Electron Content (TEC) and Very Low Frequency (VLF) space measurements derived from Global Positioning System (GPS) and DEMETER satellites, respectively. These measurements are associated with the earthquake (EQ) of a magnitude of 6.3, which occurred on 6 April 2009, in L'Aquila (Italy). Anomaly features are derived from the analysis of TEC and VLF observations recorded two weeks before and after the seismic event occurrence. A TEC map with an interpolated regional pixel resolution of 1° × 1° × 15 min in latitude, longitude and time was generated, allowing for the checking of a possible presence of disturbances over the L'Aquila region. This analysis is combined with the study of the time profile associated to the VLF flux density variations recorded by the Instrument Champ Electrique (ICE) experiment on-board DEMETER satellite. We discuss, on the one hand, the combination efficiency of the electronic density and the VLF electromagnetic measurements and, on the other hand, the difficulty to distinguish between global effects and regional ones related to the earthquake.