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Milano, Girolamo
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Milano, Girolamo
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girolamo.milano@ingv.it
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- PublicationOpen Access2D seismic tomography of Somma- Vesuvius. Description of the experiment and preliminary results.(1996-05)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Zollo, A.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;Gasparini, P.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;Biella, G.; Istituto per lo Studio del Rischio Sismico, C.N.R., Milano, Italy ;de Franco, R.; Istituto per lo Studio del Rischio Sismico, C.N.R., Milano, Italy ;Buonocore, B.; Istituto di Oceanologia, Istituto Universitario Navale, Napoli, Italy ;Mirabile, L.; Istituto di Oceanologia, Istituto Universitario Navale, Napoli, Italy ;De Natale, G.; Osservatorio Vesuviano, Ercolano, Napoli, Italy ;Milano, G.; Osservatorio Vesuviano, Ercolano, Napoli, Italy ;Pingue, F.; Osservatorio Vesuviano, Ercolano, Napoli, Italy ;Vilardo, G.; Osservatorio Vesuviano, Ercolano, Napoli, Italy ;Bruno, P. P.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;De Matteis, R.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;Le Meur, H.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;Iannaccone, G.; Dipartimento di Geofisica e Vulcanologia, Napoli, Italy ;Deschamps, A.; Institut Geodynamique, CNRS, Sophia-Antipolis, France ;Virieux, J.; Institut Geodynamique, CNRS, Sophia-Antipolis, France ;Nardi, A.; Istituto Nazionale di Geofisica, Roma, Italy ;Frepoli, A.; Istituto Nazionale di Geofisica, Roma, Italy ;Hunstad, I.; Istituto Nazionale di Geofisica, Roma, Italy ;Guerra, I.; Dipartimento di Scienze della Terra, Cosenza, Italy; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; A multidisciplinary project for the investigation of Mt. Vesuvius Structure was started in 1993. The core of the project is represented by a high resolution seismic tomography study by using controlled and natura1 sources. The main research objective is to investigate the feeding system of the vo1cano and to retrieve details of the upper crustal structure in the area. A first 2D using seismic experiment was performed in May 1994, with the aim of studing the feasibility of lIsing tomographic techniques for exploring the vo1cano interiors. Particularly, this experiment was designed to obtain information on the optimal sources-receivers configuration and on the depth extension of the volume sampled by shot-generated seismic waves. 66 three-component seismic stations and 16 single-component analogue instruments were installed by several Italian and French groups to record signals generated by three on-land, underground explosions. Sources and geophones were deployed along a 30-km NW-SE profile passing through the volcano crater. Receivers were placed at an average spacing of 250 m in the middle of the recording line and at 500 m outside. The arrival time data base was complemented by first P and S readings of micro earthquakes which occurred in the recent past within the volcano. The first arrival data set was preliminary used to determine the shallow structure of the volcano by applying Thurber's (1983) tomographic inversion technique. This analysis shows evidence for a high-velocity body which extends vertically from about 400 m below the crater down to at least 3000 m and for a shallow 300-500 m thick low-velocity cover which borders the edifice. Data from the distant shot show evidence for arrivals of deep reflected/converted phases and provide information on the deeper structure under the volcano. The results from the interpretation of 2D data are used for planning a 3D tomographic survey which will be cauied out in 1996.363 658 - PublicationOpen AccessGiuseppe Mercalli e l'Osservatorio Vesuviano: la direzione dal 1911 al 1914(INGV, 2014)
; ; ; ; ;Russo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;De Lucia, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Ricciardi, G. P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; Si parla della nomina di Mercalli a direttore del Reale Osservatorio Vesuviano e delle problematiche di un edificio in declino, delle sue proposte e della sua tragica morte128 250 - PublicationOpen AccessIl bradisismo ai Campi FlegreiLo studio dell’andamento del bradisismo ai Campi Flegrei, a partire dal IV sec. d.C. nel corso dei secoli fino ai tempi moderni, è stato possibile grazie a osservazioni compiute sulle rovine di un monumento situato a poche decine di metri dal porto di Pozzuoli: il Macellum, meglio noto come Tempio di Serapide o Serapeo. La sua peculiarità è la presenza, a varie altezze sulle tre colonne ancora erette, di fori di litodomi che sono indice del livello marino nel passato. Grazie alla datazione di tali fori è stato possibile ricostruire le oscillazioni del livello del mare dovute al sollevamento o abbassamento del suolo a Pozzuoli nel tempo.
108 38 - PublicationRestrictedThe Marsili Ridge (Southern Tyrrhenian Sea, Italy): An island-arc volcanic complex emplaced on a ‘relict’ back-arc basin(2013)
; ; ; ; ;Ventura, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Passaro, S. ;Sprovieri, M.; ; ;Marsili Seamount (b1 Ma; Southern Tyrrhenian Sea, Italy) is classically interpreted as the spreading ridge of the about 2 Ma old Marsili oceanic back-arc associated to the Southern Tyrrhenian Sea–Calabrian Arc subduction setting. High resolution bathymetric data show that the ridge extends along a NNE–SSW strike and consists of 4 sectors and 11 major segments. Seafloor failures and central-type activity from an overpressurized sill-like reservoir characterize the central sector, whereas fissural volcanism and passive magma ascent take places at the edges. Cones indicative of high effusion rates concentrate in the axial zone, whereas flat-top shields associated to lower rates are located at the northern tip. Along-axis, lateral magma migration due to a local deepening of the elastic–brittle thickness of the crust develops from the central sector toward the northern tip. The opening of the Marsili back-arc basin vanished from about 1 Ma and the Marsili Ridge formed by passive magma ascent along pre-existing fractures inherited by early spreading activity. The values of the long-term output rate, the ratio between magmatic pressure and tectonic stress, and the morphological features of the lava flows and dikes are consistent with those found in volcanic arc subduction settings. Marsili Ridge represents a volcanic arc edifice emplaced on an older, ‘relict’ back-arc. The formation of the Marsili Ridge marks the transition from an extensional subduction setting to a compressive one.212 45 - PublicationOpen AccessShallow heterogeneities and seismic activity of Mt. Vesuvius(1995-09-27)
; ; ; ; ;Vilardo, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; In the text127 248 - PublicationRestrictedSeismic activity in the transition zone between Southern and Central Apennines (Italy): Evidences of longitudinal extension inside the Ortona–Roccamonfina tectonic line(2008)
; ; ; ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Di Giovambattista, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Ventura, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; We analyze the 1997–2006 seismicity of the transition zone between Southern and Central Apennines, which is one of the most active seismic areas of Italy. Our aim is to add information on the seismotectonic picture of this area. Seismic activity is characterized by single events with Mb3.0 and low magnitude (Mb4.0) seismic sequences (1997–98 and 2005) and swarms (1999, 2000 and 2001). Hypocenters are within the upper 15 km of the crust. The epicentral distribution of the relocated seismicity shows that single events prevalently align NW–SE along the Apennine chain axis. This seismicity is related to the main, NE–SW extension affecting the chain. Single events concentrate also: at the south of the seismogenetic source responsible for the 1915 earthquake, where the 2000 swarm occurred; between the faults of the 1984 and 1805 events, where the 2001 sequence developed; between the faults of the 1805 and 1688 events, where the 1997–1998 seismic sequence concentrated. The seismic swarms occurred in 1999, 2000 and 2005 are located inside the Ortona– Roccamonfina structural line, which strikes NNE–SSW and separates the Central Apennines from the Southern ones. The epicentral distribution of these swarms and focal mechanisms suggest the presence of active NE–SW faults moving in response to a NW–SE extension. The results of the strain analysis on 52 wellconstrained focal mechanisms evidence a prevailing NE–SW extension, corresponding to the large scale stress field acting in the Apennine Chain, and a second-order NW–SE extension. This last direction of extension was already observed in the 1997–98 and 2001 seismic sequences. The location of the NE–SW striking faults responsible for the seismic swarms suggest that some segments of the Ortona–Roccamonfina line are still active and move in response to both the NE–SW regional extension of Southern Apennines, and to a NW–SE striking longitudinal extension.186 30 - PublicationRestrictedThe Seismic Crises at Mt. Vesuvius during 1995 and 1996(1999)
; ; ; ; ; ; ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Vilardo, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Ferrucci, F.; University of Calabria, Cosenza ;Gresta, S.; University of Catania; ; ; ; ; The seismicity which affects Mt.Vesuvius is, at present, the only clear indicator of the volcano dynamics. In the last years, two periods of increased seismic activity occurred (August-October 1995 and March-May 1996). This seismicity was detected by the 10 analog stations of the Permanent Seismic Network as well as by up to 7 three-component temporary digital stations. A total number of about 600 events have been recorded, four of which showing magnitude >3.0. The maximum magnitude earthquake (M=3.4) was the strongest in the last fifty years and occurred on 25 April 1996. The use of three-component seismometers allowed us to obtain very reliable hypocentral locations. The focal volume of the two seismic crises does not exceed 5-6 km of depth below the crater area. Fault plane solutions of the most energetic events show focal planes oriented NW-SE and NE-SW, in agreement with the regional tectonic features, indicating that at present the seismicity of Mt.Vesuvius develops along pre-existing discontinuities. In addition, the occurrence of a fluiddriven source mechanism suggests a role played by the underground water on the seismic energy release. Shear wave splitting analyses confirmed the presence of an anisotropic volume related to a distribution of cracks andlor fractures parallely aligned to the main faults system of the volcano.314 38 - PublicationOpen AccessLe attività del gruppo operativo SISMIKO in occasione del terremoto di Ischia Mw3.9 (MD4.0) del 21 Agosto 2017(2019-10)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; After the MD 4.0 (Mw 3.9) earthquake of August 21 2017 which occurred on the Ischia island, the SISMIKO group [Moretti et al., 2016a; 2016b], which is the coordinating group of the emergency seismic networks of INGV, was activated and four seismic mobile stations were installed in the district of Casamicciola and Lacco Ameno integrated with the permanent network on the island. At the beginning, for the first three months, all the mobile stations, coded as T13 network, acquired locally and were equipped with short period sensors and one accelerometer. Starting from October 2017, the seismic signals for three of the four stations, in separate times from October 2017 to May 2018, were transmitted in real time to the INGV monitoring acquisition room for surveillance purposes. Nowadays, the mobile seismic network on the island is composed by six stations: three of them are telemetered while the others recorded signals on local disks. The seismic stations were equipped with short period sensors LE3Dlite 1Hz, LE3D 5s and FBA-EST Kinemetrics accelerometers. Although starting from September 2017, the seismicity of Ischia island was characterized by few low magnitude earthquakes, the installation of mobile stations T13 improved the performance of the seismic network either for the localization analysis or for the detection of very low magnitude earthquakes.1472 153 - PublicationRestrictedInsights on the seismotectonics of the western part of northern Calabria (southern Italy) by integrated geological and geophysical data: Coexistence of shallow extensional and deep strike-slip kinematicsWe assess the seismotectonics of the western part of the border area between the Southern Apennines and Calabrian Arc, centered on the Mercure extensional basin, by integrating recent seismicity with a reconstruction of the structural frame from surface to deep crust. The analysis of low-magnitude (ML ≤ 3.5) events occurred in the area during 2013–2017, when evaluated in the context of the structural model, has revealed an unexpected complexity of seismotectonics processes. Hypocentral distribution and kinematics allow separating these events into three groups. Focal mechanisms of the shallower (< 9 km) set of events show extensional kinematics. These results are consistent with the last kinematic event recorded on outcropping faults, and with the typical depth and kinematics of normal faulting earthquakes in the axial part of southern Italy. By contrast, intermediate (~ 9–17 km) and deep (~ 17–23 km) events have fault plane solutions characterized by strike- to reverse-oblique slip, but they differ from each other in the orientation of the principal axes. The intermediate events have P axes with a NE-SW trend, which is at odds with the NW-SE trend recorded by strike-slip earthquakes affecting the Apulia foreland plate in the eastern part of southern Italy. The intermediate events are interpreted to reflect reactivation of faults in the Apulia unit involved in thrust uplift, and appears aligned along an ~ WNW-ESE trending deep crustal, possibly lithospheric boundary. Instead, deep events beneath the basin, which have P-axis with a NW-SE trend, hint to the activity of a deep overthrust of the Tyrrhenian back-arc basin crust over the continental crust of the Apulia margin, or alternatively, to a tear fault in the underthrust Apulia plate. Results of this work suggest that extensional faulting, as believed so far, does not solely characterizes the seismotectonics of the axial part of the Southern Apennines.
95 1 - PublicationOpen AccessThe seismic monitoring of the Mt. Vesuvius(1996-09-09)
; ; ; ; ;Vilardo, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; ;Thorkelsson, Bardi; Icelandic Meteorological OfficeIn the text137 187