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La Manna, Mauro
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La Manna, Mauro
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- PublicationRestrictedTime variant analysis of geomagnetic signals describes the volcanic activity(2008)
; ; ; ; ;Fedi, M.; Dipartimento di Scienze Della Terra, Universit degli Studi di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy ;Cascone, L.; Dipartimento di Scienze Della Terra, Università degli Studi di Napoli “Federico II”, Largo San Marcellino 10, 80138 Napoli, Italy ;Del Negro, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;La Manna, M.; Dipartimento di Scienze Della Terra, Università degli Studi di Napoli “Federico II”, Largo San Marcellino 10, 80138 Napoli, Italy; ; ; Volcanomagnetic anomalies have been mostly observed during strong eruptions. Our aim is to improve the geomagnetic data analysis to evidence the anomalies occurring in a larger time span, especially in the phases preceding the eruptive events. We developed a time variant statistical approach and applied it to the 20002002 Etna geomagnetic temporal series. It is based on an algorithm that statistically predicts the geomagnetic field at the station on the volcanic edifice by that recorded at the remote one. In such a way a number of significant changes in the time series (called statistical innovations), marking the local magnetic field change, were detected. The distribution of such statistical innovations accurately describes the Etna volcanic evolution: we note a progressive increase of the innovation occurrence as the eruptive cycles were approaching and only few and weak innovations at times between the various eruptive cycles. The significance of this analysis is further confirmed by the close agreement among the mean square prediction error, strain release and the volcanic activity behavior. On the contrary, the geomagnetic field at a single station or its difference at two stations do not have any clear correlation with other measured physical quantities. The complex pattern of the prediction error was also investigated by a multifractal analysis. We found that the Holder regularity increases with the intensification of the volcanic activity, implying that innovations tend to be less sporadic and correlated during the major volcanic phases.153 23 - PublicationRestrictedA multidisciplinary approach to characterize the geometry of active faults: the example of Mt. Massico, Southern Italy(2018-03-03)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; We present the results of a multidisciplinary and multiscale study at Mt. Massico, Southern Italy. Mt. Massico is a carbonate horst located along the Campanian-Latial margin of the Tyrrhenian basin, bordered by two main NE–SW systems of faults, and by NW–SE and N–S trending faults. Our analysis deals with the modelling of the main NE– SW faults. These faults were capable during Plio-Pleistocene and are still active today, even though with scarce and low-energy seismicity (Mw maximum = 4.8).We inferred the pattern of the fault planes through a combined interpretation of 2-D hypocentral sections, a multiscale analysis of gravity field and geochemical data. This allowed us to characterize the geometry of these faults and infer their large depth extent. This region shows very striking gravimetric signatures, well-known Quaternary faults, moderate seismicity and a localized geothermal fluid rise. Thus, this analysis represents a valid case study for testing the effectiveness of a multidisciplinary approach, and employing it in areas with buried and/or silent faults of potential high hazard, such as in the Apennine chain.246 4 - PublicationRestrictedThe 847 CE earthquake in central-southern Italy: New hints from archaeosismological and geophysical investigations in the Volturno River Valley area(2020-01-05)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Integration of archaeoseismic observations, geological and geophysical surveys and a critical review of historical written sources contributed to shed light on the effects of the 847 earthquake AD that struck a large area of Southern-Central Italy. New archaeoseismic evidence of a strong earthquake comes from two Medieval archaeological sites along the Volturno Valley, between Campania and Molise regions, which occurred around the middle of the ninth century AD. Evidence includes the tilting of pillars in the Basilica of Santa Maria near Alvignano (northern Campania) and a collapsed masonry wall in the Abbey of San Vincenzo al Volturno near Isernia (northern Molise). At Alvignano, a site so far unrecorded in seismic catalogues for the 847 earthquake, geoelectrical and georadar investigations were used to explore the subsoil and study local site conditions, which could have influenced coseismic ground motion. Integrated interpretation of geophysical surveys and borehole logs document the presence of altered pyroclastic deposits, which certainly enhanced site effects at Alvignano. Analysis of damage descriptions and of archaeological reports indicate that the 847 seismic event documented by historical sources damaged a wide area between Latium, Campania and Molise, with destruction of the town of Isernia. Although historical sources did not explicitly mention damage in Rome, seismic effects attributed to the 847 event are recorded in the archaeological and seismological literature. Because the damaged area for this medieval earthquake is loosely defined due to the scanty documentation, the present study represents an important contribution to better define the shaking area and provide new hints on the extent and location of the possible seismogenic source.347 2 - PublicationOpen AccessIntegrated geophysical survey to recognize ancient Picentia’s buried walls, in the Archaeological Park of Pontecagnano – Faiano (Southern Italy)(2008-10)
; ; ; ; ; ; ; ;Fedi, M.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy ;Florio, G.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy ;Garofalo, B.; Centro Regionale di Competenza per lo Sviluppo ed il Trasferimento dell'Innovazione Applicata ai Beni Culturali e Ambientali INNOVA, Pozzuoli (NA), Italy ;La Manna, M.; Centro Regionale di Competenza per lo Sviluppo ed il Trasferimento dell'Innovazione Applicata ai Beni Culturali e Ambientali INNOVA, Pozzuoli (NA), Italy ;Pellegrino, C.; Dipartimento di Beni Culturali, Laboratorio di Archeologia «M. Napoli», Università di Salerno, Fisciano (SA), Italy ;Rossi, A.; Dipartimento di Beni Culturali, Laboratorio di Archeologia «M. Napoli», Università di Salerno, Fisciano (SA), Italy ;Soldovieri, M. G.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy; ; ; ; ; ; There is no information on previous geophysical prospections carried out in the Archaeological Park of Pontecagnano- Faiano, in order to reconstruct the ancient settlement of Picentia, an Etrusco-Campanian and Roman settlement near Salerno (Southern Italy). Therefore, an integrated geophysical survey based on magnetic, geoelectric and ground-penetrating radar (GPR) prospections was executed in the Park. The methods provided a basic map of buried ancient structures at depth from 0.1-0.2 to about 1.5 meters. Magnetic data were processed analyzing the analytical signal of the vertical derivative of the measured gradient and this substantially reduced a strong fence effect. The results of the geophysical prospections showed archaeological structures located close to those discovered in the excavated areas. The shape of the anomalies are usually elongated with well-defined geometrical characteristics. Many anomalies are arranged along orthogonal directions and they are very coherent with the excavated structures, namely the quarters structures of the ancient Picentia.470 678