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Giampiccolo, Elisabetta
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Preferred name
Giampiccolo, Elisabetta
Email
elisabetta.giampiccolo@ingv.it
Staff
staff
ORCID
Scopus Author ID
6602676428
Researcher ID
F-9304-2019
48 results
Now showing 1 - 10 of 48
- PublicationRestrictedTwo-dimensional seismic attenuation images of Stromboli Island using active data(2015-02)
; ; ; ; ; ;Prudencio, J.; Instituto Andaluz de Geofisica, Universidad de Granada ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Ibanez, J. M.; Instituto Andaluz de Geofisica, Universidad de Granada ;Giampiccolo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Patane, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; In this work we present intrinsic and scattering seismic attenuation 2-D images of Stromboli Volcano. We used 21,953 waveforms from air gun shots fired by an oceanographic vessel and recorded at 33 inland and 10 ocean bottom seismometer seismic stations. Coda wave envelopes of the filtered seismic traces were fitted to the energy transport equation in the diffusion approximation, obtaining a couple of separate Qi and Qs in six frequency bands. Using numerically estimated sensitivity kernels for coda waves, separate images of each quality factor were produced. Results appear stable and robust. They show that scattering attenuation prevails over intrinsic attenuation. The scattering pattern shows a strong concordance with the tectonic lineaments in the area, while an area of high total attenuation coincides with the zone where most of the volcanic activity occurs. Our results provide evidence that the most important attenuation effects in volcanic areas are associated with the presence of geological heterogeneities.293 24 - PublicationOpen AccessRe-pressurized magma at Mt. Etna, Italy, may feed eruptions for years(2021)
; ; ; ; ; ; ; ; ; ; ; Identifying and monitoring the presence of pressurized magma beneath volcanoes allows for improved understanding of internal dynamics and prediction of eruptions. Here we show with time-repeated tomography clear evidence that fresh melts accumulate since 2019 in three reservoirs located at different depths in the central feeding system. In these three volumes, we observe a significant reduction of seismic wave velocity, an anomaly that has endured for almost two years. Reservoir re-pressurization induced seismicity clusters around the pressurized volumes within high fluid pressure compartments. This indicated a sharp change in volcano behavior, with re-pressurization of the central system replacing two-decade-long, flank collapse-dominated dynamics. The volume where the velocities are altered is remarkable in size, suggesting the injection of new melt, and that erupted lava represents only a small percentage. Our findings suggest that ongoing volcanic recrudescence can persist.1022 20 - PublicationRestrictedIntrusive mechanism of the 2008–2009 Mt. Etna eruption: Constraints by tomographic images and stress tensor analysis(2012-04-11)
; ; ; ; ; ; ;Alparone, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Barberi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Cocina, O.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Giampiccolo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Musumeci, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Patanè, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; Since January 2008, several geophysical parameters have evidenced a recharging phase at Mt. Etna volcano culminating with an effusive eruption that began on May 13, 2008. Seismic activity recorded at Mt. Etna from January 2007 to May 2008 was analyzed in order to provide seismological constraints to the volcano dynamics leading to the eruption. A total of 336 selected earthquakes, withML≥1.5, were used as data source for this study. Specifically, we calculated 3D velocity and attenuation tomography, including a 3D relocation of the events, and we computed 53 selected fault plane solutions (FPSs) that were used for stress tensor inversion. The most important result obtained from the joint analysis of VP, VP/VS and P-wave attenuation is an anomalous zone with normal to high VP (values between 3.5 and 4.5 km/s) and low VP/VS (values≤1.64), which partially overlaps with a low QP (values≤50) volume located along a NS trending channel beneath the central crater. This can be interpreted as a shallow volume characterized by high temperature where the magma is located with the presence of supercritical fluids. The analysis of seismic stress tensor evidenced an extensional regime in the depth range 3–13 km with a vertically oriented σ1. This finding may suggest an extensional stress regime, probably related to the kinematic response of the volcanic edifice to both a deep magmatic intrusion and a condition of decreased regional compressive stress facilitated by sliding processes of the eastern flank of the volcano.648 38 - PublicationRestrictedAttenuation of body waves in Southeastern Sicily (Italy)(2003)
; ; ; ;Giampiccolo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Gresta, S.; Dipartimento di Geologia e Geofisica, Università di Catania ;Ganci, G.; Dipartimento di Geologia e Geofisica, Università di Catania; ; The attenuation of P- and S-waves in Southeastern Sicily was estimated by applying two different methods in time and frequency domains. We analyzed waveforms from about 290 local events (0.6 ≤ ML ≤ 4.6) recorded at a three-component digital network. By applying the pulse broadeningmethod to the first P-wave pulse,we found an averageQp value of ca. 140. The application of the frequency decay method provided a Qp value of ca. 120, in the low-frequency band (3–9Hz). Conversely, in the high frequency range (16–27Hz) the average Qp is significantly larger (ca. 640). The frequency decay method was also applied to S-waves spectra. In the low frequency range (2–5Hz) the estimated average Qs is ca. 190. As for Qp, also Qs, in the high frequency range (16–27Hz), is larger (ca. 700). These results evidenced a frequency dependence of both the quality factors Qp and Qs, as commonly observed in tectonically active zones characterized by high degree of heterogeneity189 33 - PublicationOpen AccessUn anno di Comitato Unico di Garanzia: riflessioni all'INGV(2012-10-04)
; ; ; ; ; ; ; ; ; ; ;CUG INGV ;Rubbia, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia ;Hunstad, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Maramai, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Giampiccolo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Bellucci Sessa, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bordoni, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Proto, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia ;Naruli, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Taccetti, Q.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia ;Campisi, O.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;CUG INGV; ; ; ; ; ; ; ; ; ; L’Istituto Nazionale di Geofisica e Vulcanologia - INGV ha istituito il Comitato Unico di Garanzia per le pari opportunità, la valorizzazione del benessere di chi lavora e contro le discriminazioni – CUG nel luglio 2011, ai sensi della L.183/2010. Il CUG ha assunto, estendendoli, i compiti del precedente Comitato Pari Opportunità, ossia, come da delibera CD n.4.3.2.11 del 28/6/2011: • focalizzare i problemi relativi alle pari opportunità; • contribuire a migliorare la qualità della vita negli ambienti di lavoro e a valorizzare le risorse umane; • verificare gli equilibri tra i sessi nelle posizioni funzionali a parità di requisiti professionali; • formulare proposte per: la gestione flessibile delle risorse umane e le attività di formazione professionale; è inoltre chiamato a perseguire gli obiettivi della direttiva dei dipartimenti della Funzione Pubblica e per le Pari Opportunità del 4 marzo 2011, per esercitare compiti propositivi, consultivi e di verifica. I compiti affidati dall’Amministrazione da un lato e le sollecitazioni ricevute dal personale dall’altro hanno portato ad una serie di azioni, tra le principali: • la redazione di un Codice per la tutela della dignità delle persone e per la prevenzione delle molestie sessuali e morali dell’INGV, l’individuazione della Consigliera di Fiducia e l’avvio di un ciclo di seminari sull’argomento, nell’ambito della prevenzione delle discriminazioni; • una lettura di genere delle bozze dei nuovi regolamenti dell’ente, con proposte di modifiche ispirate alla Carta Europea dei Ricercatori – CdR (e.g. principi di Non discriminazione, Equilibrio di genere) e alla normativa in tema di pari opportunità e tutela della maternità, parte delle quali recepite nel Regolamento del Personale e nel Disciplinare in materia di orario di servizio; un’azione, questa, legata all’adesione in via sperimentale alla Human Resources Strategy for Researchers, iniziativa della Comunità Europea per l’effettiva implementazione della CdR; • nell’ambito del processo di valutazione della ricerca dell’ANVUR, l’evidenziazione di alcune criticità presenti nel bando, in relazione alla valutazione della maternità, risultate in una interrogazione parlamentare e in una lettera aperta, grazie al contributo dell’Associazione Donne e Scienza e dei CUG dell’INFN e del CNR. Le esperienze fatte confermano l’opportunità di dare voce a tutte le donne dell’Istituto e di fare rete tra i Comitati degli enti di ricerca.267 97 - PublicationOpen AccessRILIEVO MACROSISMICO DEL TERREMOTO EOLIANO DEL 4 DICEMBRE 2022 - ORE 08:12 locali(2022)
; ; ; ; ; ; ; ; ; ; ; ; ; Descrizione degli effetti di avvertibilità e risentimento del terremoto del 04/12/2022, ML 4.641 13 - PublicationOpen AccessRAPPORTO MACROSISMICO SUL TERREMOTO DI GUARDIA (ETNA) DEL 18/05/2023 - ORE 3:22 locali(2023)
; ; ; ; ; ; ; ; ; Descrizione degli effetti di invertibilità e risentimento del terremoto del 18/05/2023, ML 3.274 26 - PublicationOpen AccessEmpirical relationship ML-MD for the volcanic area of Mt. Etna (Italy)Empirical relationship ML-MD for the volcanic area of Mt. Etna (Italy)(2014-08)
; ; ; ;D'Amico, Salvatore; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Giampiccolo, Elisabetta; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Tuvè, Tiziana; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; Studies on seismicity at Mt. Etna are of extreme importance for the high seismic and volcanic risk which characterizes the area. In this region, seismic events are mainly located at less than 5 km b.s.l. depth, producing arrivals with medium-to low-frequency content and/or complicated signatures at stations just a few kilometers distant from the epicentral area (Patanè and Giampiccolo, 2004); on the other hand, earthquakes which present high frequency content and sharp arrivals, similar to those of typical earthquakes of tectonic areas, are mainly located between 5 and 20 km. Seismicity mainly occurs in the form of swarms, whereas foreshock-mainshock-aftershock sequences are rarely recorded, and seldom exceed magnitude 4.0 (Ferrucci and Patanè, 1993). The calculation of the local magnitude ML is more objective than that of MD because the measurement of the signal amplitude is less ambiguous with respect to the decay of the earthquake coda, which may be masked by the presence of noise, volcanic tremor, or other shocks (Del Pezzo and Petrosino, 2001; D'Amico and Maiolino, 2005). Therefore, since relationships adopted to estimate MD and ML for Mt. Etna region do not produce the same results, it is mandatory to adopt an empirical conversion to produce a homogeneous catalogue. Moreover, different magnitude scales strongly influence the slope of the frequency-magnitude distribution. In particular, comparing the a- and bvalue of the Gutenberg-Richter, different results are obtained. The Standard Linear Regression (SLR) is the simplest and most commonly used regression procedure applied in literature to carry out MD-ML relationship (e.g. Gasperini and Ferrari, 2000; Gasperini, 2002; Bindi et al., 2005; Braunmiller et al., 2005). Its application without checking whether its basic requirements are satisfied may lead to wrong results (Castellaro et al., 2006). As an alternative it is better to use General Orthogonal Regression (GOR) relation (Carrol and Ruppert, 1996), which assume a different uncertainty for each of the two variables (Lolli and Gasperini, 2012). The application of GOR methods requires the estimate of the ratio between the dependent and the independent variable variances, and when only the ratio variance is known, the GOR represents the simplest and mostly used approach. A database of magnitude observations recorded at Mt. Etna during the period 2005 – 2012 is adopted for this study. The new ML-MD relationship obtained by applying the GOR is: 1.237 0.009 0.483 0.016 L D M M (1) with a correlation coefficient R=0.90 and rms between observed and calculated ML of 0.27. The superiority of the GOR relation over the SLR has been demonstrated on the basis of the best fitting between regression line and data distribution. The ML-MD relationship obtained by GOR significantly reduces the previous bias between ML and MD estimated for earthquakes recorded at Mt. Etna and will be used for the purpose of catalogue homogenization. Conversely, the commonly used SLR may induce systematic errors in magnitude conversion, introducing apparent catalogue incompleteness, as well as a heavy bias in estimates of the slope of the frequency–magnitude distribution. All this can be avoided by using the GOR in magnitude conversions.178 97 - PublicationOpen AccessStress tensor computations at Mount St. Helens (1995-1998)(2000-10)
; ; ; ; ;Musumeci, C.; Dipartimento di Scienze Geologiche, Università di Catania, Italy ;Malone, S. D.; University of Washington, Geophysics Program, Seattle, WA, U.S.A. ;Giampiccolo, E.; Dipartimento di Scienze Geologiche, Università di Catania, Italy ;Gresta, S.; Dipartimento di Scienze Geologiche, Università di Catania, Italy; ; ; Fault plane solutions of 459 events occurring between 1995 and 1998 at Mount St. Helens (State of Washington, Northwest U.S.A.) were considered in order to infer the state of stress beneath the volcano. These events occurred in two distinct depth zones. The shallower zone is between 2 and 5.5 km, with shocks clustering in a tight cylindrical distribution about 1 km in radius directly beneath the crater. The deeper events are spread over a larger volume from 5.5 to 10 km depth and surround an aseismic zone below and slightly west of the lava dome. Faulting is characterized by a mixture of strike-slip, reverse and normal faults with maximum compression axes which do not cluster around a single direction. In the deep zone, between 5.5 and 10 km, P axes define a wheel-spoke pattern pointing radially away from the center of the aseismic zone. The 459 fault plane solutions were inverted for stress tensor parameters using the algorithm of Gephart and Forsyth. The inversion of the whole data set revealed that faulting was not produced by a uniform stress distribution. The subdivision of the zone into smaller volumes significantly reduced misfit and confidence areas of the solutions, whereas temporal subdivision of the sample did not lead to significant improvements in terms of stress uniformity. We suggest that the inhomogeneous stress field is consistent with a varying pressure source originating from the inferred crustal magma chamber and a thin conduit extending above it.158 632 - PublicationRestrictedAttenuation in Southeastern Sicily (Italy) by applying different coda(2002)
; ; ; ; ;Giampiccolo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Tusa, G.; Dipartimento di Geologia e Geofisica, Università di Catania ;Langer, H.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Gresta, S.; Dipartimento di Geologia e Geofisica, Università di Catania; ; ; The attenuation in Southeastern Sicily has been investigated using 40 aftershocks of the December 13 1990, earthquake. The quality factor of coda waves (Qc) was estimated in the frequency range 1.5–24 Hz, applying three different methods in time and frequency domains. On the whole, a clear dependence of Qc on frequency was observed, according to the general law Q = Q0(f/f0) n . The frequency dependence relationships obtained from the analysis of coda waves at three lapse time windows (10, 20 and 30 seconds) show that, for all methods, Q0 (Qc at 1 Hz) significantly increases with lapse time. In particular, Q0 is approximately 20 at short lapse time (10 s) and increases to about 70 at longer lapse time (30 s). This is attributed to the fact that larger lapse times involve deeper parts of the crust and upper lithosphere which may be characterized by larger quality factors. Moreover, the value of the exponent n decreases with increasing coda lengths from about 1.3 to 0.9, suggesting a decrease in heterogeneity of the medium with depth. Finally, Qc-values here found are of the same order as those reported from other tectonic regions like the Anatolian Highlands or Southern Spain, while significantly higher than in the neighboring volcanic area of Mt. Etna.217 27