Domains of seismic noise response in faulted limestone (central Apennines, Italy): insights into fault-related site effects and seismic hazard

Vignaroli, Gianluca; Giallini, Silvia; Polpetta, Federica; Sirianni, Pietro; Gaudiosi, Iolanda; Simionato, Maurizio; Razzano, Roberto; Pagliaroli, Alessandro; Moscatelli, Massimiliano; Mancini, Marco; Cavinato, Gian Paolo; Avalle, Alessandra

doi:10.1007/s10064-018-1276-8

Cited by 7 publications

(9 citation statements)

References 69 publications

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“…Although the low-frequency part of the dispersion curves provided information on the deeper part of the model where the resolution capability of our linear arrays is poor, the models in Fig. 14 indicate larger Vs values in the radial N330 direction with respect to the transversal one for depth larger than 30 m. Previous studies dealing with seismic anisotropy in fault zones (Pischiutta et al 2015;Godfrey et al 2017;Vignaroli et al 2018) show that the predominant polarization is connected to a nearly orthogonal direction to the main orientation of fractures and faults. Based on this argument, and taking into account that our investigations cover only the shallow part of the near-surface model, we may infer that the main orientation of the buried fractures in the studied area should approach the transversal orientation (i.e.…”

Section: Figure 14mentioning

confidence: 70%

“…; Vignaroli et al . ) show that the predominant polarization is connected to a nearly orthogonal direction to the main orientation of fractures and faults. Based on this argument, and taking into account that our investigations cover only the shallow part of the near‐surface model, we may infer that the main orientation of the buried fractures in the studied area should approach the transversal orientation (i.e.…”

Section: Resultsmentioning

confidence: 97%

“…Etna by Panzera et al (2014). The link of seismic anisotropy with the stress regime and anisotropic distribution of open crack features is confirmed in other Acocella (2007-2009 (Shelley et al 2014;Pischiutta et al 2015;Li and Peng 2017;Vignaroli et al 2018). In fault zones, the estimation of the elastic properties within the subsoil model is therefore a key issue to solve with the aid of experimental data C 2019 European Association of Geoscientists & Engineers, Near Surface Geophysics, 17, 313-329…”

Section: Introductionmentioning

confidence: 82%

“…; Li and Peng ; Vignaroli et al . ). In fault zones, the estimation of the elastic properties within the subsoil model is therefore a key issue to solve with the aid of experimental data (Ben‐Zion et al .…”

Section: Introductionmentioning

confidence: 97%

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Using a vibratory source at Mt. Etna (Italy) to investigate the wavefield polarization at Pernicana Fault

Giulio

Punzo

Bruno

et al. 2019

Near Surface Geophysics

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The paper presents the results of a controlled‐source seismic experiment performed using a vibratory source capable of producing harmonic vibrations. The survey aimed at investigating the horizontal directional amplification mechanism observed at the Pernicana Fault (Mt. Etna in Sicily, Italy) along an N150°/N330° orientation. With the vibratory source (a shaker truck) working in shear‐wave mode in the frequency range 5–40 Hz, we recorded seismic data using both three‐component velocimeters and 4.5 Hz geophones. These two types of receivers were arranged in linear configuration along two orthogonal orientations: radial and transverse to the direction of the main polarization observed within the fault zone. The two lines of seismic stations allowed us to investigate the polarization evolution as a function of the distance from the source. Results show that when the shear excitation induced by the source is parallel to the direction of observed polarization of the ground motion, the seismic signal propagates efficiently, maintaining the same horizontal polarization induced by the active source. This polarization is well recorded up to distances as large as 300 m from the source. On the contrary, when the shear excitation is orthogonal to the predominant site polarization, the ground excitation loses its initial polarization in less than 50 m away from the source position. At larger distances, the transmitted energy propagates with the natural site polarization independently from the original source polarization. The observations in terms of polarization were combined with surface‐wave analysis, aimed at investigating the dispersion characteristics of the wavefield on the geophone lines. The data suggest that the experimental Rayleigh‐wave dispersion spectra show a more coherent signal over the frequency range along the same orientation of the observed site polarization, supporting a preferential direction in the propagation of surface waves. From inversion of the Rayleigh dispersion curves, we inferred the shear‐wave velocity (Vs) to be in the range of 120–450 m/s in the first 30 m deep of Quaternary volcanic sediments. The dispersion curves are not constant along transverse and radial directions, suggesting the presence of fracture‐induced seismic anisotropy in the near surface.

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Section: Figure 14mentioning

confidence: 70%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Using a vibratory source at Mt. Etna (Italy) to investigate the wavefield polarization at Pernicana Fault

Giulio

Punzo

Bruno

et al. 2019

Near Surface Geophysics

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“…Pagliaroli et al 2011;Massa et al 2014;Giallini et al 2020); (iv) widespread faulting/fracturing network in rock masses (e.g. Pagliaroli et al 2015;Vignaroli et al 2019); and (v) stratigraphic profiles (e.g. soft soil deposits resting on stiffer materials; Semblat et al 2005;Lanzo et al 2011;Eskişar et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Physical stratigraphy and geotechnical properties controlling the local seismic response in explosive volcanic settings: the Stracciacappa maar (central Italy)

Moscatelli

Vignaroli

Pagliaroli

et al. 2020

Bull Eng Geol Environ

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Nowadays, policies addressed to prevention and mitigation of seismic risk need a consolidated methodology finalised to the assessment of local seismic response in explosive volcanic settings. The quantitative reconstruction of the subsoil model provides a key instrument to understand how the geometry and the internal architecture of outcropping and buried geological units have influence on the propagation of seismic waves. On this regard, we present a multidisciplinary approach in the test area of the Stracciacappa maar (Sabatini Volcanic District, central Italy), with the aim to reconstruct its physical stratigraphy and to discuss how subsoil heterogeneities control the 1D and 2D local seismic response in such a volcanic setting. We first introduce a new multidisciplinary dataset, including geological (fieldwork and log from a 45-m-thick continuous coring borehole), geophysical (electrical resistivity tomographies, single station noise measurements, and 2D passive seismic arrays), and geotechnical (simple shear tests performed on undisturbed samples) approaches. Then, we reconstruct the subsoil model for the Stracciacappa maar in terms of vertical setting and distribution of its mechanical lithotypes, which we investigate for 1D and 2D finite element site response analyses through the application of two different seismic scenarios: a volcanic event and a tectonic event. The numerical modelling documents a significant ground motion amplification (in the 1–1.5 Hz range) revealed for both seismic scenarios, with a maximum within the centre of the maar. The ground motion amplification is related to both 1D and 2D phenomena including lithological heterogeneity within the upper part of the maar section and interaction of direct S-waves with Rayleigh waves generated at edges of the most superficial lithotypes. Finally, we use these insights to associate the expected distribution of ground motion amplification with the physical stratigraphy of an explosive volcanic setting, with insights for seismic microzonation studies and local seismic response assessment in populated environments.

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Evaluation of complex site effects through experimental methods and numerical modelling: The case history of Arquata del Tronto, central Italy

Giallini

Pizzi

Pagliaroli

et al. 2020

Engineering Geology

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Domains of seismic noise response in faulted limestone (central Apennines, Italy): insights into fault-related site effects and seismic hazard

Cited by 7 publications

References 69 publications

Using a vibratory source at Mt. Etna (Italy) to investigate the wavefield polarization at Pernicana Fault

Using a vibratory source at Mt. Etna (Italy) to investigate the wavefield polarization at Pernicana Fault

Physical stratigraphy and geotechnical properties controlling the local seismic response in explosive volcanic settings: the Stracciacappa maar (central Italy)

Evaluation of complex site effects through experimental methods and numerical modelling: The case history of Arquata del Tronto, central Italy

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