Lithospheric P- and S-wave velocity models of the Sicilian area using WAM tomography: procedure and assessments

Calò, Marco; Parisi, Laura; Luzio, Dario

doi:10.1093/gji/ggt252

Cited by 26 publications

(31 citation statements)

References 54 publications

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“…In order to increase the detail of our analysis with respect to previous study carried out in the same sector Calò et al, 2013;Chiarabba et al, 2008;Orecchio et al, 2011), we performed a tomographic inversion by applying the LOTOS algorithm (Koulakov, 2009). We used the data of local seismicity occurred in the study region and collected from the available national and local networks managed by INGV (www.ingv.it) and University of Calabria, respectively.…”

Section: Methodsmentioning

confidence: 99%

Detailed crustal structure in the area of the southern Apennines–Calabrian Arc border from local earthquake tomography

Totaro

Koulakov

Orecchio

et al. 2014

Journal of Geodynamics

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Section: Methodsmentioning

confidence: 99%

Detailed crustal structure in the area of the southern Apennines–Calabrian Arc border from local earthquake tomography

Totaro

Koulakov

Orecchio

et al. 2014

Journal of Geodynamics

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“…The total amount of data consisted of 56,225 P and 23,858 S wave travel times, complemented by 119,866 P and 49,262 S differential times. Synthetic tests, performed to assess the resolving power of the data and the procedure used, showed the suitability to discriminate seismic structures of dimension (20 × 20 × 2) km 3 in the inland areas and (40 × 40 × 5) km 3 in the offshore ones [ Calò et al ., ]. The average horizontal and vertical event location errors, estimated for the whole Sicilian area, are 1.44 km and 3.1 km, respectively.…”

Section: Geophysical Studies Based On Local Earthquake Tomographymentioning

confidence: 98%

“…Pattern of the Sicilian seismicity and surrounding basins relocated using three‐dimensional V p and V s models. Numbers are referred to the major seismic clusters [from Calò et al ., ].…”

Section: Geophysical Studies Based On Local Earthquake Tomographymentioning

confidence: 99%

“…Seismic tomography of the area [ Calò et al ., ] imaged the main geological structures of the crust and upper mantle of Sicily and surrounding basins. To reconstruct three‐dimensional models of the P and S seismic velocities body wave travel times (first arrivals of P and S waves) from local and regional seismicity were used.…”

Section: Geophysical Studies Based On Local Earthquake Tomographymentioning

confidence: 99%

“… P wave seismic velocity model of the Sicilian area at 15 and 25 km depths. The black dots are the projections of the seismic events used to calculate the velocity model and located within ±2.5 km from the slice [from Calò et al ., ]. The bold black lines are the projections of the two vertical sections A‐A′ and B‐B′ reported below.…”

Section: Geophysical Studies Based On Local Earthquake Tomographymentioning

confidence: 99%

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A regional-scale discontinuity in western Sicily revealed by a multidisciplinary approach: A new piece for understanding the geodynamic puzzle of the southern Mediterranean

et al. 2015

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The results of an integrated stratigraphic, structural, geophysical, and geochemical study reveal the presence of a crustal discontinuity in western Sicily that, at present, runs roughly N-S along a band from San Vito Lo Capo to Sciacca. The boundary between the two zones of this discontinuity is nearly orthogonal to the main thrust propagation of the Sicilian thrust-and-fold belt. The different Permian to Tertiary sedimentary evolution recorded by the two zones appears related to this discontinuity, with thick carbonate platforms in the western sector facing deepwater successions in the eastern one. The presence of Upper Triassic reefs, huge megabreccia bodies, and widespread submarine volcanisms along the transition zone suggests the presence of a long-lasting weakness zone. This zone has been reactivated episodically as transpressional and/or transtensional faults in relation to the different geodynamic stress acting in central Mediterranean area in different epochs. We speculate that this transition zone has represented a segment of the passive margin of the Ionian Tethys. During the Maghrebian convergence a different style of deformation has affected the two sectors floored by different sedimentary multilayers. The orthogonal-to-oblique differential convergence between the two sectors has resulted in right-lateral transpressional motions, leading to oblique thrusting of deepwater-derived thrusts onto platform-derived thrusts associated with clockwise rotations. The oblique convergence is still ongoing as demonstrated by the seismicity of the area, by the geothermal field with high mantle-derived helium fluxes and by the GPS measurements collected by different authors.According to Casero and Roure [1994], in western Sicily a NW-SE regional trending shear zone (Segesta Fault) runs across the Sicilian fold-and-thrust belt (SFTB), from San Vito Lo Capo to the Sciacca area. The authors consider the Segesta Fault to be a first-order crustal structure, as it is observed in seismic lines offshore of Sciacca. However, the field evidence of this strike-slip fault is weak.

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Can faults become barriers for deep fluid circulation? Insights from high‐resolution seismic VSP tomography at the Soultz‐sous‐Forêts geothermal site

Calò

Dorbath

Lavadera

2016

Geophysical Research Letters

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Vertical Seismic Profile (VSP) surveys are generally used for modelling converted phases of the seismic body waves propagating in the medium allowing the detection of waves interpreted as reflections on steeply dipping reflecting structures such as faults, abrupt lateral changes of lithology, and fractures. At the Enhanced Geothermal System geothermal field of Soultz‐sous‐Forêts the analysis of data recorded during a VSP experiment allowed describing the presence of at least two structures near the wells. Here we show how seismic tomography method can be applied to the VSP data to reconstruct the 3‐D shape of structures in the volume surrounding the geothermal wells. The three‐dimensional P wave velocity model obtained shows positive velocity anomalies associated with the main faults observed by the VSP analysis and negative anomalies in the regions affected by massive hydraulic stimulations performed in the past. This pattern can be explained as a different response of the rock volume to the fluid injections where regions marked by relative pre‐existing high permeability were less affected by the hydraulic stimulations. This difference in permeability produced regions that could work as barriers for fluid diffusion through the reservoir. Comparisons of our high resolved model with the location of the induced seismicity and with another model obtained using seismic noise correlation give evidence of the presence of these structures and may explain the poor connection between the wells GPK4 and GPK2–GPK3 system.

show abstract

Lithospheric P- and S-wave velocity models of the Sicilian area using WAM tomography: procedure and assessments

Cited by 26 publications

References 54 publications

Detailed crustal structure in the area of the southern Apennines–Calabrian Arc border from local earthquake tomography

Detailed crustal structure in the area of the southern Apennines–Calabrian Arc border from local earthquake tomography

A regional-scale discontinuity in western Sicily revealed by a multidisciplinary approach: A new piece for understanding the geodynamic puzzle of the southern Mediterranean

Can faults become barriers for deep fluid circulation? Insights from high‐resolution seismic VSP tomography at the Soultz‐sous‐Forêts geothermal site

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