Salvatore de Lorenzo

University of Bari

GeologySeismologyAttenuationCalderaGeophysics

25Publications

10H-index

258Citations

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Publications 24

Newest

#1Marilena FilippucciH-Index: 5

#2Edoardo Del Pezzo (UGR: University of Granada)H-Index: 23

Last. Andrea Natale TallaricoH-Index: 11

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Abstract Crustal seismic attenuation in the Gargano Promontory (Southern Italy) was inferred by analyzing coda waves of about one hundred small magnitude earthquakes recorded by the OTRIONS local seismic network. Coda attenuation Qc was computed using the Sato (1977) model, i.e. the assumption of single back-scattering, at different lapse times and at different frequencies. Average Qc is comparable with the same quantity measured in the adjacent area of the Umbria–Marche region (central Italy). ...

#1Ali K. Abdel-Fattah (KSU: King Saud University)H-Index: 7

#2Salvatore de LorenzoH-Index: 10

Last. Nasser S. Al-Arifi (KSU: King Saud University)H-Index: 4

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This study aims to recognize the influence of source- and path-effects on seismic spectra using the waveform data from the 2009 seismic activity, Harrat Lunayyir (HL), eastern flank of the Red Sea coastline, Saudi Arabia. This seismic activity is considered as a series of continuously evolving events reaching at some stage the maximum on 19 May 2009, with the largest shock of Mw 5.4, and then decayed. A total number of 218 events of magnitudes ML ≥ 2.0 were analyzed, which include the largest sh...

#1Marilena Filippucci (University of Bari)H-Index: 5

#2Andrea Tallarico (University of Bari)H-Index: 10

Last. Salvatore de Lorenzo (University of Bari)H-Index: 10

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We consider a thermo-rheological model made of a viscoelastic half-space with Maxwell rheology and temperature-dependent viscosity. The half-space is made of layers with different values of density, thermal conductivity, activation energy and heat productivity. The model relates the surface heat flow to the depth of the brittle-ductile transition and the thickness of the seismogenic layer. The model is applied to the Gargano area (Italy) which is subject to a frequent low-magnitude seismic activ...

#1Salvatore de Lorenzo (University of Bari)H-Index: 10

#2Maddalena Michele (University of Bari)H-Index: 3

Last. Andrea Tallarico (University of Bari)H-Index: 10

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We investigate the elastic properties of the crust in the Gargano promontory, located in the northern part of the Apulia region (Southeastern Italy). Starting on April, 2013, a local-scale seismic network, composed of 12 short-period (1 Hz) seismic stations, was deployed on the Gargano promontory. Starting on October, 2013, the network was integrated with the recordings of nine seismic stations managed by the Italian Institute of Geophysics and Volcanology (INGV). The network recorded more than ...

A three-dimensional QP imaging of the shallowest subsurface of Campi Flegrei offshore caldera, southern Italy

#1Vincenzo SerlengaH-Index: 3

#2Salvatore de LorenzoH-Index: 10

Last. Aldo ZolloH-Index: 38

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A three-dimensional QP imaging of the shallowest subsurface of Campi Flegrei offshore caldera, southern Italy

#1Vincenzo SerlengaH-Index: 3

#2Salvatore de Lorenzo (University of Bari)H-Index: 10

Last. Aldo ZolloH-Index: 38

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To improve the knowledge of the shallowest subsurface of Campi Flegrei caldera, a 3-D P wave attenuation tomography of the area was performed. We analyzed about 18,000 active seismic traces, which provided a dataset of 11,873 Δt* measurements, e.g. the differential traveltimes to quality factor ratios. These were inverted through an adapted tomographic inversion procedure. The 3-D tomographic images reveal an average QP about 70, interpreted as water-saturated volcanic and marine sediments. An a...

Seismic Q estimates in Umbria Marche (Central Italy): hints for the retrieval of a new attenuation law for seismic risk

#1Angelo Pisconti (University of Bari)H-Index: 1

#2Edoardo Del Pezzo (UGR: University of Granada)H-Index: 23

Last. Salvatore de Lorenzo (University of Bari)H-Index: 10

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A first look at the Gargano (southern Italy) seismicity as seen by the local scale OTRIONS seismic network

#1Salvatore de Lorenzo (University of Bari)H-Index: 10

#2Annalisa Romeo (University of Bari)H-Index: 2

Last. Andrea Tallarico (University of Bari)H-Index: 10

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On April 2013, a local scale seismic network, named OTRIONS, composed of twelve short period (1 Hz) three component seismometers, has been located in the northern part of the Apulia (southern Italy). In the first two months of data acquisition, the network recorded about one hundred very small (M L <2) magnitude earthquakes. A three-layer 1D V P velocity model was preliminarily computed, using the recordings of earthquakes occurred in the area in the period 2006-2012 and recorded by the national...

Frequency dependent Qα and Qβ in the Umbria-Marche (Italy) region using a quadratic approximation of the coda-normalization method

#1Salvatore de Lorenzo (University of Bari)H-Index: 10

#2Francesca BiancoH-Index: 22

Last. Edoardo Del Pezzo (UGR: University of Granada)H-Index: 23

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SUMMARY The coda normalization method is one of the most used methods in the inference of attenuation parameters Qα and Qβ. Since, in this method, the geometrical spreading exponent γ is an unknown model parameter, the most part of studies assumes a fixed γ, generally equal to 1. However γ and Q could be also jointly inferred from the non-linear inversion of codanormalized logarithms of amplitudes, but the trade-off between γ and Q could give rise to unreasonable values of these parameters. To m...

#1Salvatore de Lorenzo (University of Bari)H-Index: 10

#2Edoardo Del Pezzo (UGR: University of Granada)H-Index: 23

Last. Francesca BiancoH-Index: 22

view all 3 authors...

Abstract The attenuation of coda and S waves has been inferred for the Umbria–Marche region (central Italy) using seismic waveforms collected during the 1997 seismic crisis. The selected dataset is composed of 343 small magnitude (1.4 M L Sato (1977) method, based on the assumption of single isotropic scattering has been used to infer Q c, considering three different lapse times (20, 30 and 40 s). The coda normalization method ( Aki, 1980 ) has been used to infer Q β . Both Q c and Q β show a cl...

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