Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 2 2010 10.5194/nhess-10-215-2010 http://www.nat-hazards-earth-syst-sci.net/10/215/2010/ http://www.nat-hazards-earth-syst-sci.net/10/215/2010/nhess-10-215-2010.html http://www.nat-hazards-earth-syst-sci.net/10/215/2010/nhess-10-215-2010.pdf 215 216 2010-02-09 <i>Brief communication</i> "A pre seismic radio anomaly revealed in the area where the Abruzzo earthquake (<i>M</i>=6.3) occurred on 6 April 2009" P. F. Biagi biagi@fisica.uniba.it L. Castellana T. Maggipinto D. Loiacono L. Schiavulli T. Ligonzo M. Fiore E. Suciu A. Ermini Department of Physics, University of Bari, Via Amendola 173, 70126 Bari, Italy Inter-Department Centre for the Evaluation and Mitigation of the Volcanic and Seismic Risk, University of Bari, Via Amendola 173, Bari, Italy Elettronika s.r.l., Palo del Colle 70027, Bari, Italy Elettronika Research, Brasov, Romania Department of Mechanical Engineering, University of Roma Tor Vergata, Via di Tor Vergata, 00133 Rome, Italy We report the information that in the days of the radio anomaly presented in the paper Biagi et al. (2009) an interruption of the broadcasting from the transmitter (RMC, France) happened. It remains unclear if the action resulted in a complete power off of the system, or in a reduction in the radiated power, and if this has affected France only, or every direction. Should a complete power off have occurred, the proposed pre-seismic defocusing is inexistent. Our doubts on this action are reported. Biagi, P. F., Castellana, L., Maggipinto, T., Loiacono, D., Schiavulli, L., Ligonzo, T., Fiore, M., Suciu, E., and Ermini, A.: A pre seismic radio anomaly revealed in the area where the Abruzzo earthquake ($M$=6.3) occurred on 6 April 2009, Nat. Hazards Earth Syst. Sci., 9, 1551–1556, 2009. Genzano, N., Aliano, C., Corrado, R., Filizzola, C., Lisi, M., Mazzeo, G., Paciello, R., Pergola, N., and Tramutoli, V.: RST analysis of MSG-SEVIRI TIR radiances at the time of the Abruzzo 6 April 2009 earthquake, Nat. Hazards Earth Syst. Sci., 9, 2073–2084, 2009. Molchanov, O. A. and Hayakawa, M.: Subionospheric VLF signal perturbations possibly related to earthquakes, J. Geophys. Res., 103, 17489–17504, 1998. Papadopoulos, G. A., Charalampakis, M., Fokaefs, A., and Minadakis, G.: Strong foreshock signal preceding the L'Aquila (Italy) earthquake ($M_\rm W$ 6.3) of 6 April 2009, Nat. Hazards Earth Syst. Sci., 10, 19–24, 2010. Papanikolaou, I. D., Foumelis, M., Parcharidis, I., Lekkas, E. L., and Fountoulis, I. G.: Deformation pattern of the 6 and 7 April 2009, $M_\rm W$=6.3 and $M_\rm W$=5.6 earthquakes in L'Aquila (Central Italy) revealed by ground and space based observations, Nat. Hazards Earth Syst. Sci., 10, 73–87, 2010. Pergola, N., Aliano, C., Coviello, I., Filizzola, C., Genzano, N., Lacava, T., Lisi, M., Mazzeo, G., and Tramutoli, V.: Assessing of the Robust Satellite Techniques for monitoring TIR anomalies at the time of the Abruzzo earthquake, Nat. Hazards Earth Syst. Sci., in press, 2010\blackbox\bf reference changed according to our database!!OK??. Rozhnoi, A., Solovieva, M., Molchanov, O., Schwingenschuh, K., Boudjada, M., Biagi, P. F., Maggipinto, T., Castellana, L., Ermini, A., and Hayakawa, M.: Anomalies in VLF radio signals prior the Abruzzo earthquake ($M$=6.3) on 6 April 2009, Nat. Hazards Earth Syst. Sci., 9, 1727–1732, 2009. Tsolis, G. S. and Xenos, T. D.: A qualitative study of the seismo-ionospheric precursors prior to the 6 April 2009 earthquake in L'Aquila, Italy, Nat. Hazards Earth Syst. Sci., 10, 133–137, 2010.