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The subsoil of the city of Rome (Italy): Results from a dense temporary seismic network

Urheber*innen

Vassallo,  Maurizio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bobbio,  Antonella
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cultrera,  Giovanna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Di Giulio,  Giuseppe
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mercuri,  Alessia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Esposito,  Alessandro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Milana,  Giuliano
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bordoni,  Paola
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ciaccio,  Maria Grazia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cara,  Fabrizio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Vassallo, M., Bobbio, A., Cultrera, G., Di Giulio, G., Mercuri, A., Esposito, A., Milana, G., Bordoni, P., Ciaccio, M. G., Cara, F. (2023): The subsoil of the city of Rome (Italy): Results from a dense temporary seismic network, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2955


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018933
Zusammenfassung
We present the results from a temporary seismic network of 24 stations installed in the urban area of Rome (Italy) from January 10, 2021 until April 08, 2021, with the aim of studying the city's urban subsoil through analysis based on ambient seismic noise. Rome is the largest Italian city (with about three million people) with a history of art, architecture and culture that influenced the world and dating back almost 3000 years ago. The city retains a monumental heritage characterized by a high fragility due to its age. Both the high number of inhabitants and the fragility of its monuments make the city particularly vulnerable to possible earthquakes, even if the seismic hazard of the area is considered as moderate. The continuous recordings from the network allowed the use of ambient seismic noise to derive spectral ratios at sites located in different geological and lithological contexts. Moreover, signals from regional earthquakes were surprisingly well recorded despite the high anthropic noise-level, showing a clear areal variability referable to site effects. In this case, we also benefit from a low-noise period due to the partial lockdown for COVID pandemia. Interferometric analyses based on seismic noise cross-correlation of acquired data, show that it is possible to reconstruct the surface waves at station pairs in the frequency band between 0.2 and 1 Hz. It is then possible to perform a 3D velocity model through Ambient Noise Tomography to characterize shapes, thickness and properties of different geological/lithological units of the subsoil of the city.