Empirical evidence of orthogonal relationship between directional site effects and fracture azimuths in an active fault zone: The case of the Mt. Etna lower eastern flank

Panzera, Francesco; Tortorici, Giuseppe; Romagnoli, Gino; Marletta, G; Catalano, Stefano

doi:10.1016/j.enggeo.2020.105900

Cited by 16 publications

(8 citation statements)

References 53 publications

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“…The top of this layer consists of high‐resistivity alkaline lavas and lahar deposits, cropping out along the 180 m high sea‐cliff of the Timpa di Acireale (Figure 2; Acireale Synthem of Branca et al., 2011; 155–130 ky B.P.). This volcanic sequence dips gently toward the west‐northwest (Panzera et al., 2020), and abruptly terminates against the raised marly‐clay substratum. The contact of the ancient lavas against the sedimentary substratum of the Acitrezza Ridge is buried beneath a veneer of lavas, associated with activity of the modern stratovolcano (<15 ky B.P.…”

Section: Geological Settingmentioning

confidence: 99%

The 2018 Mount Etna Earthquake (Mw 4.9): Depicting a Natural Model of a Composite Fault System From Coseismic Surface Breaks

et al. 2021

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Section: Geological Settingmentioning

confidence: 99%

The 2018 Mount Etna Earthquake (Mw 4.9): Depicting a Natural Model of a Composite Fault System From Coseismic Surface Breaks

et al. 2021

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“…Similar effects were also observed across fault damage zones (FDZs), with maximum amplification and polarization transversal to the predominant fracture field held open by the acting stress field (Martino et al, 2006;Rigano et al, 2008;Di Giulio et al, 2009;Marzorati et al, 2011;Pischiutta et al, 2012;Vignaroli et al, 2019;Panzera et al, 2014;Panzera et al, 2020), such as due to stiffness anisotropy. This interpretation was confirmed by comparison with S-wave splitting studies (Pischiutta et al, 2015;Panzera et al, 2017) and by the controlled-source seismic experiment involving polarized seismic sources (Di Giulio et al, 2019).…”

Section: Introductionmentioning

confidence: 67%

“…Directional amplification has been observed so far in different geological frameworks, such as 1) fractured rock slopes/gravitational instabilities/landslides (Del Gaudio and Wasowski, 2007;Moore et al, , 2018Burjánek et al, 2012;Häusler et al, 2019), 2) fault damage zones (Pischiutta et al, 2012;Hailemikael et al, 2016;Di Giulio et al, 2019;Vignaroli et al, 2019), and 3) the volcanic environment (Falsaperla et al, 2010;Petrosino et al, 2012;Panzera et al, 2020;Petrosino & De Siena, 2021).…”

Section: Introductionmentioning

confidence: 99%

Directional amplification and ground motion polarization in Casamicciola area (Ischia volcanic island) after the 21 August 2017 Md 4.0 earthquake

2022

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In this paper, we investigated ground motion directional amplification and horizontal polarization using ambient noise measurements performed in the northern sector of Ischia Island which suffered damage (VIII EMS) during the 21 August 2017, Md 4.0 earthquake. Over 70 temporary seismic stations were installed by the INGV EMERSITO task force, whose aim is to monitor site effects after damaging earthquakes in Italy. To investigate ground motion directional amplification effects, we have applied three different techniques, testing their performance: the HVSR calculation by rotating the two horizontal components, the covariance matrix analysis, and time–frequency domain polarization analysis. These techniques resulted in coherent outcomes, highlighting the occurrence of directional amplification and polarization effects in two main sectors of the investigated area. Our results suggest an interesting pattern for ground motion polarization, that is mainly controlled by recent fault activity and hydrothermal fluid circulation characterizing the northern sector of the Ischia Island.

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“…In the case of the dispersion curves, they are obtained directly from the f-k analysis. In the case of the ellipticty curves, they were previously extracted from the experimental HVSR curves [42,56] and then used as input data of the Dinver software. Alternatively, HVSR curves can also be used as input data if some considerations are taken into account [41,57].…”

Section: Inversion Of the Dispersion And Hvsr Curvesmentioning

confidence: 99%

Ambient Noise Measurements to Constrain the Geological Structure of the Güevéjar Landslide (S Spain)

et al. 2021

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The reactivation of very large landslides may cause severe damage to society. Its prevention and management requires detailed information on the geometry and structure of these landslides, but the use of standard techniques (boreholes) may be prohibitive from an economic point of view. To overcome these difficulties, geophysical techniques are of special interest because they allow for studying very large areas at a reasonable cost. In this paper, we present a case study wherein the analysis of ambient noise allowed us to produce a model of a large landslide near Granada (southern Spain). The geometry and location of the failure zone, as well as the assessment of the state of involved materials, were estimated by combining two available boreholes and different geophysical techniques (downhole tests and the spectral analysis of ambient noise, horizontal to vertical spectral ratios (HVSR) and the frequency-wavenumber (f-k) methods). The results have allowed us to differentiate between values within the landslide mass with respect to those of stable materials, and to perform for the first time a comprehensive geological model of this unstable mass. Differences were also observed within the landslide mass (earth flow vs. slide zones), which are attributed to differences in the degree of alteration and the disturbance of the internal structure of materials constituting the landslide mass. These results show that techniques based on the measurement of ambient noise are of special interest for studying very large, highly remolded landslide masses.

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Empirical evidence of orthogonal relationship between directional site effects and fracture azimuths in an active fault zone: The case of the Mt. Etna lower eastern flank

Cited by 16 publications

References 53 publications

The 2018 Mount Etna Earthquake (Mw 4.9): Depicting a Natural Model of a Composite Fault System From Coseismic Surface Breaks

The 2018 Mount Etna Earthquake (Mw 4.9): Depicting a Natural Model of a Composite Fault System From Coseismic Surface Breaks

Directional amplification and ground motion polarization in Casamicciola area (Ischia volcanic island) after the 21 August 2017 Md 4.0 earthquake

Ambient Noise Measurements to Constrain the Geological Structure of the Güevéjar Landslide (S Spain)

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