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Seismological studies for site effect characterization of Ancona city following the Mw 5.5 Costa Marchigiana-Pesarese earthquake (Central Italy)

Urheber*innen

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

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

Famiani,  Daniela
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;

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

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

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

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

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

Emersito,  working group
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Cultrera, G., Vassallo, M., Famiani, D., Di Giulio, G., Cara, F., Marzorati, S., Pacor, F., Riccio, G., Lovati, S., Emersito, w. g. (2023): Seismological studies for site effect characterization of Ancona city following the Mw 5.5 Costa Marchigiana-Pesarese earthquake (Central Italy), XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4187


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021626
Zusammenfassung
We present the activities of EMERSITO, the INGV emergency task force with skills and experience in seismic response studies and in seismic microzonation, in the follow-up to the Mw 5.5 (ML 5.7) earthquake of November 9, 2022 06:07:25 UTC localized in the Costa Marchigiana Pesarese area (Central Italy). Based on geological information and damage estimates in the epicentral areas, EMERSITO focused its intervention in Ancona, the capital of Regione Marche, located at about 40 km south of the epicenter. This city is located in an area characterized by a remarkable seismic hazard, as evidenced by the extensive damage of the 1972 earthquakes (Mw up to 4.7), with part of the urban territory susceptible to landslide phenomena. A temporary seismic network consisting of 11 seismic stations equipped with velocimeter and accelerometer was installed in different urban areas of the city, acquiring data in continuous mode for about 4 months. The analysis of ambient vibrations and aftershock recordings collected by the network suggests a variability of the site response depending on the outcropping lithologies. The peak frequencies from spectral ratio analysis range between 1 and 3 Hz for 6 stations, while other stations are characterized by peak frequencies between 3.5 and 9.5 Hz. The H/V noise spectral ratios do not show peaks with very high amplitudes (< 3), likely indicating the lack of strong impedance contrasts, at least in the shallow part of the subsoil.