GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 2.1 91 from the ground it should produce atmospheric pressure differences. Pressure differences are also characteristics of meteorological perturbations. In the atmosphere they are responsible for air movements and, if air ions are present in the atmosphere, pressure differences are also responsible for air ion movements. Consequently, electromagnetic waves are emitted with ion movements. However, the CIEN recording of electric fields were relatively stable oscillatory phenomena, indicating that a stable phenomena of bounded source occurred. The possibility that ions form stable spherically symmetric charge configurations in the atmosphere has been investigated with the aim of better understanding unusual atmospheric phenomena, such as ball lightning and EQL (Singer, 1978; Tennakone, 2006). Such a model of spherically symmetric and dynamically stable structures has been proposed for the atmosphere via balancing of electrostatic force and air pressure (Tennakone, 2011); they have oscillating solutions. The above model, applied to low charge density oscillating objects, might explain why the electric field oscillations were recorded by the CIEN stations during relevant seismic activity. References Antonioli, A., Piccinini, D., Chiaraluce, L., Cocco, M., 2005. Fluid flow and seismicity pattern: Evidence from the 1997 Umbria-Marche (central Italy) seismic sequence, Geophys. Res. Lett., 32 L10311, 2005. Barchi, M., De Feyter, A., Magnani, M., Minelli, G., Pialli, G., Sotera, B., Extensional tectonics in the Northern Apennines (Italy): Evidence from the CROP03 deep seismic reflection line. Mem. Soc. Geol. Ital. 52, 528–538, 1998a. Barchi, M., Minelli, R., Pialli, G., The crop 03 profile: A synthesis of results on deep structures of the northern Apennines. Mem. Soc. Geol. Ital. 52, 383–400, 1998b. Bina A. Observatory, at www.binapg.it/ , seismic data collected in 2014. Catalli, F., Cocco, M., Console, R., Chiaraluce, L., Modeling seismicity rate changes during the 1997 Umbria-Marche sequence (central Italy) through a rate - and state - dependent model, J. Geophys. Res. 113, B11301, 2008. Chiaraluce, L., Chiarabba, C., Collettini, C., Piccinini, D., Cocco, M., 2007. Architecture and mechanics of an active low-angle normal fault: Alto Tiberina Fault, Northern Apennines, Italy, J. Geophys. Res. 112, B10310, 2007. Collettini, C., Barchi M.R., A low angle normal fault in the Umbria region (central Italy): Amechanical model for the related microseismicity. Tectonophysics 359, 97–115, 2002. Dobrovolsky, I.P.; Zubkov, S.I.; Miachkin, V.I. Estimation of the size of earthquake preparation zones. Pure Appl. Geophys., 117, pp. 1025-1044, 1979. Fidani, C., Electromagnetic signals recorded by Perugia and S. Procolo (Fermo) stations before the L’Aquila earthquakes, 28th GNGTS, Trieste, p. 370-373, Nov. 16-19, 2009. Fidani, C., ELF signals by Central Italy electromagnetic network in 2008-2010, 29th GNGTS, Prato, p. 175-179, Oct. 28-30, 2010. Fidani, C., The Central Italy Electromagnetic Network and the 2009 L’Aquila earthquake: observed electric activity, geosciences, 1, p. 3-25, December 2011. Fidani, C., Albarello, D., Arcaleni, M., Martinelli, G., Siciliani, P. M., Tardioli, S., Vannucchi, A., Emilia earthquake: VLF transmitters and ELF signal from the Central Italy Electromagnetic Network (CIEN), 31th GNGTS, Potenza, p. 415-420, Nov. 20-22, 2012. Freund, F. T., Kulahci, I. G., Cyr, G., Ling, J., Winnick, M., Tregloan-Reed, J., Freund, M. M., Air ionization at rock surface sand pre-earthquake signals. J. Atmos. Solar-Terr. Phys., 71, 1824–1834, 2009. Marzorati, S., Massa, M., Cattaneo, M., Monachesi, G., Frapiccini, M., Very detailed seismic pattern and migration inferred from theApril 2010 Pietralunga (northern ItalianApennines) micro-earthquake sequence, Tectonophysics, 610, 91–109, 2014. Miller, S., Collettini, C., Chiaraluce, L., Cocco, M., Barchi, M., Klaus, B., Aftershocks driven by a high pressure CO 2 source at depth. Nature, 427, 724–727, 2004. Mirabella, F., Brozzetti, F., Lupattelli, A., Barchi, M.R., 2011. Tectonic evolution of a low-angle extensional fault system from restored cross-sections in the Northern Apennines (Italy). Tectonics, 30, TC6002, 2011. Noir, J., Jacques, E., Be`kri, S., Adler, P.M., King, G.C.P., Fluid flow triggered migration of events in the 1989 Dobi earthquake sequence of Central Afar. Geophys. Res. Lett. 24, 2335–2338, 1997. Pialli, G., Barchi, M., Minelli, G., Results of the CROP03 deep seismic reflection profile Mem. 52. Soc. Geol. Ital. Ed., Rome, 1998. Siciliani, P. M., Fidani, C., Stoppa, F., Iezzi, G., Arcaleni, M., Tardioli, S., Marcelli, D., Electromagnetic perturbations associated with M=5, July 21, 2013, Ancona, Italy earthquake observed by CIEN, 32th GNGTS, Trieste, p. 66-70, Nov. 19-21, 2013.