Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/18302
Title: Results from shallow geophysical investigations in the northwestern sector of the island of Malta
Authors: Pischiutta, Martha
Villani, Fabio
D'Amico, Sebastiano
Vassallo, Maurizio
Cara, Fabrizio
Farrugia, Daniela
Mercuri, Alessia
Galea, Pauline
Rovelli, Antonio
Akinci, Aybige
Famiani, Daniela
Cantore, Luciana
Giulio, Giuseppe di
Naccio, Deborah di
Amoroso, Sara
Keywords: Geophysical surveys -- Malta
Surface waves (Seismology) -- Malta
Seismology -- Observations
Issue Date: 2016
Publisher: Elsevier
Citation: Pischiutta, M., Villani, F., D'Amico, S., Vassallo, M., Cara, F., Farrugia, D., ... Amoroso, S. (2016). Results from shallow geophysical investigations in the northwestern sector of the island of Malta. Physics and Chemistry of the Earth, 95, 1-8.
Abstract: We performed geophysical investigations in the northwestern sector of the island of Malta to reconstruct velocity-depth models and provide shear-wave velocity profiles. We have chosen two sites, one located in Rabat (Malta) and another in the Golden Bay area. We used both active (seismic and electrical 2D-tomography, Multichanel Analysis of Surface Waves – MASW) and passive (2D arrays and single-station measurements using ambient noise) geophysical methods. Consistently with previous studies performed in this part of Malta, we have found that both sites are characterized by site resonance in the frequency range 1–2 Hz as an effect of the local lithostratigraphic succession that shows an impedance contrast at about 60–90 m depth. This resonance effect can have important implications on both seismic hazard as well as seismic risk evaluation of the region since the amplified frequency range coincides with the resonance frequencies typical of 5–10 storey buildings which are very diffuse in the Maltese Islands, especially after intense recent urbanization. We also highlight the importance of performing seismic velocity measurements even at rock sites. As an example, the Golden Bay site would be classified as class “A” following the EuroCode EC8 when considering only the outcropping lithology represented by limestone rocks. Conversely the subsoil characterization provided by this study has revealed that this site falls in the EC8 class “B”, stressing the importance of direct geophysical measurements since the a-priori assignment to A-class could lead to wrong estimates in evaluating the site response.
URI: https://www.um.edu.mt/library/oar//handle/123456789/18302
Appears in Collections:Scholarly Works - FacSciGeo

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