3D-Kernel Based Imaging of an Improved Estimation of (Qc) in the Northern Apulia (Southern Italy)

Filippucci, Marilena; Lucente, Salvatore; Pezzo, Edoardo Del; Lorenzo, Salvatore de; Prosser, Giacomo; Tallarico, Andrea

doi:10.3390/app11167512

Cited by 4 publications

(2 citation statements)

References 71 publications

(117 reference statements)

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“…The second dataset of envelopes (http://dx.doi.org/10.17632/w9hsj2whzm.1#folder-7a917d26-6be4-4014-8103-a8760541264a, accessed on 5 September 2021), which consists of the recordings of the period from July 2015 to August 2018, was used in a 3D study of Q c ( [9]) of the Gargano Promontory and surrounding areas (Southern Italy). It consists of the recordings of 191 microearthquakes, with magnitudes ranging between 1 and 2.8, that were recently used to study the Gargano active faults [10].…”

Section: Discussionmentioning

confidence: 99%

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Seismic Envelopes of Coda Decay for Q-coda Attenuation Studies of the Gargano Promontory (Southern Italy) and Surrounding Regions

Filippucci

Lucente

Lorenzo

et al. 2021

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Here, we describe the dataset of seismic envelopes used to study the S-wave Q-coda attenuation quality factor Qc of the Gargano Promontory (Southern Italy). With this dataset, we investigated the crustal seismic attenuation by the Qc parameter. We collected this dataset starting from two different earthquake catalogues: the first regarding the period from April 2013 to July 2014; the second regarding the period from July 2015 to August 2018. Visual inspection of the envelopes was carried out on recordings filtered with a Butterworth two-poles filter with central frequency fc = 6 Hz. The obtained seismic envelopes of coda decay can be linearly fitted in a bilogarithmic diagram in order to obtain a series of single source-receiver measures of Qc for each seismogram component at different frequency fc. The analysis of the trend Qc(fc) gives important insights into the heterogeneity and the anelasticity of the sampled Earth medium.

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Section: Discussionmentioning

confidence: 99%

“…To these files, a linear regression in Equation ( 1) was applied to retrieve the value at each frequency [6]. A discussion about errors and uncertainties can be found in [9] Figure 3. Three-component seismograms at station OT01, as an example.…”

Section: Methodsmentioning

confidence: 99%

Seismic Envelopes of Coda Decay for Q-coda Attenuation Studies of the Gargano Promontory (Southern Italy) and Surrounding Regions

Filippucci

Lucente

Lorenzo

et al. 2021

Data

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Qβ, Qc, Qi, Qs of the Gargano Promontory (Southern Italy)

et al. 2023

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We have provided the first estimate of scattering and intrinsic attenuation for the Gargano Promontory (Southern Italy) analyzing 190 local earthquakes with ML ranging from 1.0 to 2.8. To separate the intrinsic $${Q}_{i}$$ Q i and scattering $${Q}_{s}$$ Q s quality factors with the Wennerberg approach (1993), we have measured the direct S waves and coda quality factors ($${Q}_{\beta }$$ Q β , $${Q}_{c}$$ Q c ) in the same volume of crust. $${Q}_{\beta }$$ Q β parameter is derived with the coda normalization method (Aki 1980) and $${Q}_{c}$$ Q c factor is derived with the coda envelope decay method (Sato 1977). We selected the coda envelope by performing an automatic picking procedure from $${T}_{\mathrm{start}}=1.5{T}_{S}$$ T start = 1.5 T S up to 30 s after origin time (lapse time $${T}_{L}$$ T L ). All the obtained quality factors clearly increase with frequency. The $${Q}_{c}$$ Q c values correspond to those recently obtained for the area. The estimated $${Q}_{i}$$ Q i are comparable to the $${Q}_{c}$$ Q c at all frequencies and range between 100 and 1000. The $${Q}_{s}$$ Q s parameter shows higher values than $${Q}_{i}$$ Q i , except for 8 Hz, where the two estimates are closer. This implies a predominance of intrinsic attenuation over the scattering attenuation. Furthermore, the similarity between $${Q}_{i}$$ Q i and $${Q}_{c}$$ Q c allows us to interpret the high $${Q}_{c}$$ Q c anomaly previously found in the northern Gargano Promontory up to a depth of 24 km, as a volume of crust characterized by very low seismic dumping produced by conversion of seismic energy into heat. Moreover, most of the earthquake foci fall in high $${Q}_{i}$$ Q i areas, indicating lower level of anelastic dumping and a brittle behavior of rocks.

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Seismic attenuation tomography of Eastern Europe from ambient seismic noise analysis

Borleanu,

Petrescu,

Placinta

et al. 2023

Geophysical Journal International

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Summary The Eastern-Europe region (EER), is a complex geotectonic area that captures part of the Alpine-Himalayan Orogen, the subduction of multiple NeoTethys Branches and part of the East European Craton. It is one of the most exciting geological areas in Europe due to a diversity of tectonic processes acting within it: extensional basin evolution, oceanic subduction, post-collisional volcanism, as well as active crustal deformation associated with the push of the Adria plate or the pull of the actively detaching Vrancea slab. This makes EER an excellent natural laboratory to study the behavior of the lithosphere-asthenosphere system in a heterogeneous tectonic setting. To investigate the lateral heterogeneity and physical properties of the crust in the EER, we use ambient seismic noise data recorded by the vertical components of broadband stations that have been operational between 1999 and 2020 in Eastern Europe and surrounding regions. We used this significant amount of data and the latest processing techniques of the ambient seismic noise field based on the continuous wavelet transform to compute cross-correlations between various station pairs, turning every available seismic station into a virtual source. The coda of the inter-station cross-correlograms were used to determine coda quality factors (Qc) of Rayleigh waves in four different period ranges (3.0–5.0s, 5.0–10.0s, 10.0–20.0s and 20.0–30.0s) and to invert them in the 2D space, constructing the highest resolution attenuation tomography of the region. Our results reveal high attenuation features throughout the north-east Pannonian region, the Bohemian Massif, the East Carpathians, and the Moesian Platform. Nevertheless, our findings do not emphasize a close correlation between the depth of sedimentary basins and attenuation features identified at longer periods. In addition, Qc variations are larger at short periods, indicating higher heterogeneity in the uppermost crust of Eastern Europe. Our findings demonstrate the higher efficiency of noise correlation approaches relative to earthquake data analyses investigating Qc at low frequencies.

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3D-Kernel Based Imaging of an Improved Estimation of (Qc) in the Northern Apulia (Southern Italy)

Cited by 4 publications

References 71 publications

Seismic Envelopes of Coda Decay for Q-coda Attenuation Studies of the Gargano Promontory (Southern Italy) and Surrounding Regions

Seismic Envelopes of Coda Decay for Q-coda Attenuation Studies of the Gargano Promontory (Southern Italy) and Surrounding Regions

Qβ, Qc, Qi, Qs of the Gargano Promontory (Southern Italy)

Seismic attenuation tomography of Eastern Europe from ambient seismic noise analysis

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