The seismic microzonation study of Pescara del Tronto (Central Italy) during and after the Central Italy earthquake sequence.

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.

Guest editorial: seismic microzonation of Central Italy following the 2016–2017 seismic sequence

“…The paper by Amanti et al (2020b) focuses on the Seismic Microzonation activities conducted during the emergency and post-emergency phases in Pescara del Tronto, which suffered almost complete destruction after the Amatrice earthquake. The authors gathered all geological, geotechnical and geophysical data useful for outlining a sound subsurface model in the area and combined a rapid assessment of the landslide susceptibility and ground response analysis to locate areas for provisional settlements.…”

Reconstruction of a Reference Subsoil Model for the Seismic Microzonation of Gori (Georgia): A Procedure Based on Principal Component Analysis (PCA)

“…Simplified approaches are applied at Level 2 (Peruzzi et al, 2016;Paolucci et al, 2020), where 1D seismic resonance phenomena are expected. Level 3 microzonation is planned where the complexity of subsoil geometries and rough surface morphology prevent the use of simplified approaches (i.e., Level 2) and where permanent instabilities may occur (Amanti et al, 2020b;Pagliaroli et al, 2019).…”