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Della Monica, G.
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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 - PublicationRestrictedConditions for long-lasting gas eruptions: The 2013 event at Fiumicino International Airport (Rome, Italy)(2016)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ;; ; ; ;; ; ;; ; ; ; ; ; ; ;A hazardous gas eruption from two very close shallow boreholes occurred near the Fiumicino International Air- port of Roma (Italy) from August to December 2013. The erupted gas was mostly CO2 of deep origin and gas out- put was high and sustained over time reaching values of nearly 20 t day− 1. After 3 months, the gas flux was still above 5 t day− 1 and was only stopped in December 2013 by long and expensive works of closure of the bore- holes. The gas eruption was uncommon as being associated with the building of two mud volcanoes. This style of sustained deep CO2 eruptions contrasts with the more common short-lived eruptions of shallow biogenic methane-dominated gas pockets. In this work, we present the chronology of the event, the results of geological, geochemical, and geophysical monitoring and a numerical modeling. We propose that the August–December 2013 sustained and prolonged event does not relate to the simple degassing of a shallow, isolated pocket of gas. On the contrary, it reflects very specific conditions in a shallow reservoir (hosted in a 10 m thick gravel layer at −40 m within the Tiber river delta deposits), related to the interplay between the total pressure and the fraction of free CO2 initially present, across very narrow value ranges around 0.59 MPa and 0.18, respectively. The coexistence of short-lived and long-lived eruptions from the same reservoir suggest that these conditions are not achieved everywhere in the gas reservoir, despite its homogeneous properties. This consideration implies ei- ther a pressure compartmentalization of the reservoir, or the occurrence of a transient, possibly associated with an impulsive release of gas from greater depths. The involvement of deeper and larger gas reservoirs connected along faults is evidenced by geophysical investigations. This conceptual model bears significant implications for gas hazard studies554 6