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Del Pezzo, Edoardo
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Preferred name
Del Pezzo, Edoardo
Email
edoardo.delpezzo@ingv.it
Staff
staff
ORCID
Researcher ID
A-7492-2011
153 results
Now showing 1 - 10 of 153
- PublicationRestrictedIntermediate-focus earthquakes under South Shetland Islands (Antarctica)(1997)
; ; ; ; ; ; ;Ibanez, J.; University of Granada, Spain ;Morales, J.; University of Granada, Spain ;Alguacil, G.; University of Granada, Spain ;Almendros, J.; University of Granada ;Ortiz, R.; CSIC Madrid ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; Intermediate-focus seismicity (50192 22 - PublicationRestrictedJoint observation of coherent coda waves at surface and underground arrays(2013-04-16)
; ; ; ; ;La Rocca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Galluzzo, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Scarpa, R.; Università di Salerno; ; ; Local and regional seismicity jointly recorded by two dense small aperture arrays, one installed at surface and one at 1.3 km depth, constitutes an interesting data set useful for coda observations. Applying array techniques to earthquakes recorded at the two arrays we measure slowness, backazimuth and correlation coefficient of the coherent coda wave signals in five frequency bands in the range 1–10 Hz. Slowness distributions show marked differences between surface and underground, with slow signals at surface (slowness greater than 1.0 s km−1) that are not observed underground. We interpret these coherent signals as surface waves produced by the interaction of body waves with the free surface characterized by rough topography. The backazimuth values measured in the frequency bands centred at 1.5 and 3 Hz are almost uniformly distributed between 0 and 360◦, while those measured at higher frequencies show different distributions between surface and underground. On the contrary, the earthquake envelopes show very similar coda shapes between surface and underground recordings, with an almost constant coda-amplitude ratio (between 4 and 8) in a wide frequency range.243 25 - PublicationOpen AccessFirst 2-D intrinsic and scattering attenuation images of Mt Etna volcano and surrounding region from active seismic data(2020)
; ; ; ; ; ; ; ; ;; ; ; ; We present 2-D attenuation images of the Mt Etna volcanic region on the basis of separation of intrinsic and scattering effects. The analysis presented here exploits a large active seismic database that fully covers the area under study. We observe that scattering effects dominate over intrinsic attenuation, suggesting that the region is very heterogeneous. Comparison with analyses conducted at other volcanoes reveals that the Mt Etna region is characterized by high intrinsic attenuation, resulting from the presence of large volcanoclastic deposits at shallow depth. The 2-D distributions of intrinsic and scattering anomalies show the presence of regions characterized by high and low attenuation effects, corresponding to several tectonic and volcanic features. In particular, we identify a high attenuation region in the SW sector of the Mt Etna volcanic complex, which is correlated with high seismicity rates and volcanism. This work supports the hypothesis of a link between the dynamics of the SW flank and the recharge of the volcano in the last decades, occurring under the summit crater and, secondarily, the upper South rift zone.1489 123 - PublicationOpen AccessShear wave splitting time variation by stress-induced magma uprising at Mount Etna volcano(2006-05-24T13:19:55Z)
; ; ; ; ;Bianco, F.; Istituto Nazionale Geofisica e Vulcanologia , Osservatorio Vesuviano, Napoli. ;Scarfì, L.; Istituto Nazionale Geofisica e Vulcanologia Sez. Catania ;Del Pezzo, E.; Istituto Nazionale Geofisica e Vulcanologia , Osservatorio Vesuviano, Napoli. ;Patanè, D.; Istituto Nazionale Geofisica e Vulcanologia Sez. Catania; ; ; Shear wave splitting exhibits clear time variations before the July 17th – August 9th, 2001 flanK eruption at Mount Etna. The normalized time delays, Tn, detected through an orthogonal transformation of singular value decomposition, exhibit a clearincrease starting 20 days before the occurrence of the eruption (July 17th); the qS1 polarization direction, obtained using a 3D covariance matrix decomposition, shows a 90°-flip several times during the analyzed period: the last flip 5 days before the occurrence of the eruption. Both splitting parameters also exhibit a relaxation phase shortly before the starting of the eruption. Our observations seem in agreement with Anisotropic Poro Elasticity (APE) modelling, suggesting a tool for the temporal monitoring of the build up of the stress leading to the occurrence of the 2001 eruption at Mt. Etna.165 417 - PublicationRestrictedMathLTWA: Multiple lapse time window analysis using Wolfram Mathematica 7(2010)
; ; ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; The MATHCAD 2000 professional code to perform the Multiple Lapse Time Analysis (MLTWA) has been revised and rewritten in MATHEMATICA 7. The new code contains two new procedures to find the minimum of the misfit function between observation and model and a new example of application to real data from Chamoli earthquake aftershock sequence237 46 - PublicationRestrictedRete Mobile e Laboratorio Analisi aVanzate (LAV) - Rendiconto 2013(2014-03)
; ; ; ; ; ; ; ;Cusano, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Galluzzo, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;La Rocca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bianco, F. ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ;; In the text262 94 - PublicationOpen AccessSEISMIC WAVEFIELD ARRAY PROCESSING ANALYSIS USING WAVELET COHERENCE(2005-12-09)
; ; ; ;Nisii, V.; OSSERVATORIO VESUVIANO (I.N.G.V.) NAPOLI ;Saccorotti, G.; OSSERVATORIO VESUVIANO (I.N.G.V.) NAPOLI ;Del Pezzo, E.; OSSERVATORIO VESUVIANO (I.N.G.V.) NAPOLI; ; Volcanic signals are one of the most difficult subject of study for seismologists. The lack of clear body-wave phase arrivals and the rapid loss of signal coherence with distance make generally impossible application of traditional location techniques based on travel times inversion. Overthe past ten years,however,the wides pread application of multichannel techniques hasal lowed forrobust and reliable locations of these signals over abroad range of frequencies. Consequent to the largely increased computing capabilities, array processing in Volcano Observatories is now developing to ward thereal-time detection and tracking of volcanic sources. However,the energy of volcanic signals may spread over abroad frequency interval(Fig.1).The successful detection and measurement of these signals requirest herefore subsequent band-pass filtering operations, and exact tayloring of the time window lengthsto the central frequency of each filter. Exploting the localisation properties of Continuos Wavelet Transforms (CWT)in the time and frequency /scaledomains,in this workweuse multichannel Wavelet Coherence (WCO)toperform signal detection from local correlation information. For the time/scale regions of high multichannel coherence, wethenextend the MUltiple Signal Classification (MUSIC) methodto the spatial covariance matrice sobtained from the complex-valued wavele tcoefficient timeseries127 176 - PublicationRestrictedThe 3D Attenuation Structure of Deception Island (Antarctica)(2015)
; ; ; ; ; ; ;Prudencio, J.; Istituto Andaluz de Geofisica, University of Granada ;De Siena, L.; Institut fu¨r Geophysik, University of Mu¨nster, Correnstrasse 24, 48149 Mu¨nster, Germany ;Ibanez, J. M.; Istituto Andaluz de Geofisica, University of Granada ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Garcia-Yeguas, A.; Istituto Andaluz de Geofisica, University of Granada ;Diaz-Moreno, A.; Istituto Andaluz de Geofisica, University of Granada; ; ; ; ; The seismic and volcanological structure of Deception Island (Antarctica) is an intense focus topic in Volcano Geophysics. The interpretations given by scientists on the origin, nature, and location of the structures buried under the island strongly diverge. We present a high-resolution 3D P-wave attenuation tomography model obtained by using the coda normalization method on 20,293 high-quality waveforms produced by active sources. The checkerboard and synthetic anomaly tests guarantee the reproduction of the input anomalies under the island down to a depth of 4 km. The results, once compared with our current knowledge on the geological, geochemical, and geophysical structure of the region, depict Deception as a piecemeal caldera structure coming out of the Bransfield Trough. Highattenuation anomalies contouring the northeastern emerged caldera rim correlate with the locations of sediments. In our interpretation, the main attenuation contrast, which appears under the collapsed southeastern caldera rim, is related to the deeper feeding systems. A unique P-wave high-attenuation spherical-like anomaly in the inner bay extends between depths of 1 and 3 km. The northern contour of the anomaly coincides with the calderic rim both at 1 and 2 km, while smaller anomalies connect it with deeper structures below 3 km, dipping toward the Bransfield Trough. In our interpretation, the large upper anomaly is caused by a high-temperature shallow (1–3 km deep) geothermal system, located beneath the sediment-filled bay in the collapsed blocks and heated by smaller, deeper contributions of molten materials (magma) rising from southeast.208 28 - PublicationRestrictedLocation of the Source and Shallow Velocity Model Deduced from the Explosion Quakes Recorded by Two Seismic Antennas at Stromboli Volcano(2000)
; ; ; ; ; ; ; ;La Rocca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Saccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Simini, M.; Università di Salerno ;Ibanez, J.; Instituto Andaluz de Geofisica ;Almendros, J.; Instituto Andaluz de Geofisica ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; ; The seismic wavefield associated to the ongoing eruptive activity at Stromboli vvolcano (Italy) is investigated using data from two small-aperture, short period seismic arrays deployed on the northern and western flanks, located at about 1.7 km from the active craters.173 29 - PublicationRestrictedQc of three component seismograms of volcanic earthquakes at Campi Flegrei volcanic area - Southern Italy(1985)
; ; ; ; ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;De Natale, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Scarcella, G.; University of Naples ;Zollo, A.; University of Naples; ; ; A frequency dependence quite different from that evaluated in active tectonic regions was found for coda attenuation.271 25