Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 7 2010 10.5194/nhess-10-1487-2010 http://www.nat-hazards-earth-syst-sci.net/10/1487/2010/ http://www.nat-hazards-earth-syst-sci.net/10/1487/2010/nhess-10-1487-2010.html http://www.nat-hazards-earth-syst-sci.net/10/1487/2010/nhess-10-1487-2010.pdf 1487 1494 2010-07-09 Decrease of VLF transmitter signal and Chorus-whistler waves before l'Aquila earthquake occurrence M. Y. Boudjada mohammed.boudjada@oeaw.ac.at K. Schwingenschuh R. Döller A. Rohznoi M. Parrot P. F. Biagi P. H. M. Galopeau M. Solovieva O. Molchanov H. K. Biernat G. Stangl H. Lammer I. Moldovan W. Voller M. Ampferer Space Research Institute, Austrian Academy of Sciences, Graz, Austria Institute of Physics, Department of Geophysics, Astronomy and Meteorologie, KF University Graz, Graz, Austria Institute of the Earth Physics, Russian Academy of Sciences, Moscow, Russia Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, Orléans, France Department of Physics, University of Bari, Bari, Italy Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS, UVSQ, Guyancourt, France Institute of Physics, Department of Theoretical Physics, KF University Graz, Graz, Austria Federal Office of Metrology and Surveying, Vienna, Austria National Institute of Research and Development for Earth Physics, Bucharest, Rumania We investigate the VLF emissions observed by the Instrument Champ Electrique (ICE) experiment onboard the DEMETER micro-satellite. We analyze intensity level variation 10 days before and after the occurrence of l'Aquila earthquake (EQ). 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