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Biagi, P. F.
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- PublicationOpen AccessArtificial and natural electromagnetic signals revealed during two years in the Amare cave (Central Italy)(1994-11)
; ; ; ; ; ; ; ; ;Bella, F.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Bella, R.; IBM - SEMEA, Roma, Italy ;Biagi, P. F.; Dipartimento di Scienze della Terra, Università “La Sapienza”, Roma, Italy ;Caputo, M.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Della Monica, G.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Ermini, A.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Plastino, W.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Sgrigna, V.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy; ; ; ; ; ; ; n 1990, some instrumentation was set up in the Amare cave (southern slope of the Gran Sasso chain, L'Aquila) in order to pick up electric signals ranging from 0.3 to 300 kHz, magnetic signals from 0.3 to 30 kHz and seismoacoustic signals by means of three geophones with natural frequencies of 0.3 kHz, 25 kHz and 150 kHz. Data are recorded every ten minutes on a solid state memory. The analysis of the data allows us to establish the existence of electromagnetic fields of distant origin connected with broadcastings and with tropical lightning activity and the discontinuous presence of local electric and magnetic signals, coupled with seismoacoustic ones, connected with weather events. A qualitative explanation of these near fields is given.188 325 - PublicationOpen AccessNormal and anomalous behaviour of electric, magnetic and seismoacoustic signals recorded in the Amare cave(1996-01)
; ; ; ; ; ; ; ;Bella, F.; Dipartimento di Fisica, III Università di Roma, Italy ;Biagi, P. F.; Dipartimento di Fisica, Università di Bari, Italy ;Caputo, M.; Dipartimento di Fisica, Università La Sapienza, Roma, Italy ;Della Monica, G.; Dipartimento di Fisica, III Università di Roma, Italy ;Ermini, A.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy ;Plastino, W.; Dipartimento di Fisica, III Università di Roma, Italy ;Sgrigna, V.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy; ; ; ; ; ; Since 1987 multichannel instrumentation has been recording electromagnetic and seismoacoustic emissions in the Amare cave (Gran Sasso í L'Aquila). Equipment detecting RMC (Principality of Monaco) longwave broadcasting (216 kHz) has been operating in the same place. Data collected during this period have pointed out two different phenomena called «quiet» and «perturbed» that characterize the normal behaviour of the cave. On 25 August 1992 an earthquake with M = 3.9 occurred in the Gran Sasso area and on 4 June 1993 an earthquake with M = 4.3 occurred in Umbria, 100 km to north of the Amare cave. Before these earthquakes, electromagnetic, seismoacoustic, and RMC data showed anomalies. Here we present the observed phenomenology and discuss the possibility that the anomalies can be considered precursors of the earthquakes.166 195 - PublicationOpen AccessAn overview on preseismic anomalies in LF radio signals revealed in Italy by wavelet analysis(2008-02)
; ; ; ; ;Biagi, P. F.; Dipartimento di Fisica, Università degli Studi di Bari, Italy ;Castellana, L.; Dipartimento di Fisica, Università degli Studi di Bari, Italy ;Maggipinto, T.; Dipartimento di Fisica, Università degli Studi di Bari, Italy ;Ermini, A.; Dipartimento di Ingegneria dell’Impresa, Università degli Studi di Roma Tor Vergata, Roma, Italy; ; ; Since 1996, the electric field strength of the two broadcasting stations MCO (f=216 kHz, southeast France) and CZE (f=270 kHz, Czech Republic) has been sampled every ten minutes by a receiver (AS) located in central Italy. Here, we review the results obtained by a detailed analysis applied to the data recorded from February 1996 up to December 2004. At first, the daytime and nighttime data were extracted and then, in the daytime data, the data collected in winter were separated from those collected in summer. On the second step the wavelet transform was applied. The results of this analysis are radio anomalies detected as earthquake precursors both for MCO and CZE data. In particular, regarding the MCO data, the main result was the appearance of a very clear anomaly during May-August 1998, at daytime and at nighttime. Such an anomaly can be considered as a precursor of a seismic sequence started on August 15, 1998 with 17 earthquakes (M=2.2-4.6) on the Reatini mountains, a seismogenic zone located 30 km far from the AS receiver along the path MCO-AS. As concerns with the CZE data, the first result was obtained from the summer daytime data and it was the appearance of a very clear anomaly during August-September 1997, that can be considered a precursor of the two earthquakes with magnitude M=5.6 and M=5.9 that occurred on September 26 in the Umbria-Marche region (Central Italy). The second result was the appearance of an anomaly during February-March 1998, at daytime and at nighttime, that can be related to the preparatory phase of the strong (M=5.1-6.0) Slovenia seismic sequence that occurred in a zone lying in the middle of the CZE-AS path.151 276 - PublicationOpen AccessIrpinia earthquake 23 November 1980 – Lesson from Nature reviled by joint data analysis(2007-02)
; ; ; ; ; ;Pulinets, S. A.; Instituto de Geofísica, Universidad Nacional Autónoma de México, México ;Biagi, P.; Dipartimento Interateneo di Fisica «M. Merlin», Università degli Studi e Politecnico di Bari, Italy ;Tramutoli, V.; Dipartimento di Ingegneria e Fisica dell’Ambiente, Università degli Studi della Basilicata, Italy ;Legenka, A. D.; Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Science, Russia ;Depuev, V. K.; Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Science, Russia; ; ; ; A devastating earthquake of magnitude 6.9 occurred in Southern Italy on 23rd November 1980 in Irpinia-Basilicata area. Variations of different geochemical, atmospheric and ionospheric parameters and electromagnetic emissions were registered around the time of the Irpinia earthquake. The substantial progress reached in understanding the physics of the electromagnetic and thermal anomalies associated with the earthquake preparation process permitted us to create the Lithosphere-Atmosphere-Ionosphere (LAI) coupling model published recently. It shows that the observed effects are not independent but present the cause-consequence chain of physical processes and plasma- chemical reactions. We try to analyze the seismic data, radon emanation, hydrological anomalies, ground based ionosondes network, NOAA/AVHRR Thermal Infrared Irradiance (TIR) anomaly, Intercosmos-19 satellite topside sounding and VLF emissions data using the concept of the developed model and existing laboratory and largescale active experiments on air ionization. If the observed radon activity is really connected with the earthquake preparation process, all other variations of the atmosphere and ionosphere parameters can be explained as a consequence of the main physical process – air ionization by radon.720 1935 - PublicationOpen AccessDisturbances in LF radio-signals as seismic precursors(2001-10)
; ; ; ; ; ; ; ;Biagi, P. F.; INFM-Dipartimento di Fisica, Università di Bari, Italy ;Piccolo, R.; INFM-Dipartimento di Fisica, Università di Bari, Italy ;Ermini, A.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy ;Martellucci, S.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy ;Bellecci, C.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy ;Hayakawa, M.; Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo, Japan ;Kingsley, S. P.; Sheffield Centre for Earth Observation Science, University of Sheffield, U.K.; ; ; ; ; ; Low Frequency (LF) radio signals lie in the band 30-300 kHz. Monitoring equipment able to measure the electric strength of such signals, at field sites with very low noise levels, were designed and assembled in Italy. From 1993 onwards, the electric field strength of the MCO (216 kHz, France) broadcasting station has been measured at two sites in Central Italy. At the end of 1996, radio signals from the CLT (189 kHz, Italy) and the CZE (270 kHz, Czech Republic) broadcasting stations were included in the measurements. During this monitoring period, evident attenuation of the electric field strength in some of the radio signals was observed at some of the receivers. The duration of the attenuation observed was several days and so it could have been related to particular meteorological conditions. On the other hand, this phenomenon could also represent precursors of moderate (3.0 =M =3.5) earthquakes that occurred near the receivers (within 50 km) along the transmitter-receiver path. In this case it is possible that some local troposphere defocusing of the radio signals, produced by the pre-seismic processes, might have occurred. These observations were related only to moderate earthquakes and in these cases it may be that suitable meteorological conditions are needed to observe the effect. During February-March 1998 at one measuring site, we observed a significant increase in the CZE electric field strength. Unfortunately, the data of the other receiver could not be used in this case because of frequent interruptions in the recordings. The increase might have been a precursor of a strong earthquake (M = 5.3) that occurred on March 26, 1998 in the Umbria-Marche zone at a location over 100 km from the receiver, but which lay along the transmitter-receiver path. In this case, it is possible that an ionospheric disturbance, produced by the pre-seismic processes, might have occurred. If this pre-seismic behaviour of the LF signals could be confirmed then this type of precursor would seem capable of giving information on the direction, and perhaps even the rough location, of a forthcoming earthquake.155 488