The seismic microzonation study of Pescara del Tronto (Central Italy) during and after the Central Italy earthquake sequ
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The seismic microzonation study of Pescara del Tronto (Central Italy) during and after the Central Italy earthquake sequence. M. Amanti1 · L. M. Puzzilli1 · V. Chiessi1 · M. Roma1 · M. D’Orefice1 · D. Fiorenza1 · A. Troccoli1 · F. Ferri1 Received: 5 November 2018 / Accepted: 5 August 2020 © Springer Nature B.V. 2020
Abstract Site effects in consequence of the 2016–2018 Central Italy seismic sequence “marked the fate” of many villages located close to the epicenters along the Apennine chain. Pescara del Tronto, a small settlement located on a mountain slope in the municipality of Arquata del Tronto, (AP) is very representative of such territories since, early after the onset of the seismic sequence, suffered very impressive site effects, including a large seismicallyinduced debris flow and a high number of small volume landslides. This paper describes the main results of the scientific activities carried out by the authors in this locality in the framework of the unprecedented large-scale Seismic Microzonation project funded by Italian Government in Central Italy for 138 territories. Through an intense field activity, the geological and geomorphologic setting of the study area were revised and updated, including a landslide susceptibility assessment that helped the Italian Department of Civil Protection in the emergency management for temporary housing and, later on, was included in the 3rd Level Seismic Microzonation study implemented by authors while the seismic sequence was still ongoing. A very detailed and reliable subsoil model for this municipality was defined, despite difficulties faced in performing direct and indirect investigations due to the safety restrictions for many areas. The Local Seismic Site response was finally assessed for this locality and the results discussed. A key role in the occurrence of strong site effects into Pescara del Tronto has been played by quaternary deposits having an unexpected heterogeneity under the old village.
1 Introduction Due to the seismic sequence that began on August 24th 2016 with a Mw 6.0 earthquake and hit a wide portion of Central Italy, the Arquata del Tronto municipality (AP- Central Italy) suffered massive destruction and loss of lives. The sequence peaked in the Mw=6.5 event occurred on 30th October 2016 after thousands of aftershocks and many M>4 events * M. Amanti [email protected] 1
Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA) – Servizio Geologico d’Italia, Rome, Italy
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Bulletin of Earthquake Engineering
causing the complete destruction of tens of villages across the Abruzzo, Lazio, Marche and Umbria Regions (Chiaraluce et al. 2017; Cheloni et al. 2018; Brozzetti et al. 2019; Graziani et al. 2019). The seismic sequence lasted until the 2018, including the 18th January 2017 Mw 5.5 and Mw 5.1 events near Capitignano (Abruzzo region) and the Mw 4.6 event occurred the 10th of April 2018 in the Marche region about 8 km south of Camerino (Marche Region). Due to its geo-structural complexity
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