The landslide of Pomarico, South Italy, occurred on January 29th 2019
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Angelo Doglioni I Nicola Casagli I Massimiliano Nocentini I Francesco Sdao I Vincenzo Simeone
The landslide of Pomarico, South Italy, occurred on January 29th 2019
Abstract Pomarico is a very small town in Basilicata, South Italy, historically landslide prone. The latest main landslide started on 25th of January 2019, on the northern east side of the hill, rapidly evolving and causing, on January 29th, the collapse of the main road of the town as well as of the overlooked buildings and serious damages of several buildings of the town. This work introduces the main features of this landslide and the earlier results of the studies on this phenomenon. The main geological characteristics of the site and the morphological features of the landslide are presented. Moreover, the interpretation of the complex failure mechanism as well as an analysis of the singularity of the triggering rainfall event are shown. Finally, this work focuses on the terrestrial radar monitoring system, installed after the event, and its preliminary outcomes. Keywords Earth slide . Earth flow . Failure mechanism . Triggering factors . Monitoring Introduction Pomarico is a very small town, located in Basilicata, South Italy, see Fig. 1. It is in the south-eastern part of the Bradanic Trough, a Pleistocenic basin filled by typical foredeep sequences ranging between the lower-mid Pliocene and the mid Pleistocene (Guerricchio and Melidoro 1979; Galeandro et al. 2017). The town is at the top of a narrow long hilly ridge where regressive deposits outcrop: clays, clayey sands, and conglomerates. The ridge sides are quite steep and historically subject to manifold severe landslides, mainly roto-translation slides evolving in earth flows. Some are dormant others are active usually showing very slow movements. However, these landslides sometimes generated sudden movements, causing widespread damages to the town. The main events during the latest half century were in November 1959, March 1973, 1986, and 1997 (Palumbo 2019), all after prolonged and abundant precipitations. The latest landslide, see Fig. 1, activated on January 25th 2019, after a sequence of prolonged low-intensity rainfalls. The earlier failure was a large rotational slide evolving into a channelized earth-flow along the southern west side of Pomarico ridge. Initially a bulkhead, built up at the end of the twentieth century, blocked the retrogressive evolution of the slide. However, on January 29th, the retaining structure failed and the landslide evolved causing the collapse of the main road of the town: Corso Vittorio Emanuele II, see Figs. 1 and 2, together with 20 buildings. Moreover, 12 buildings were damaged and 25 were evacuated. The area involved by the 2019 landslide is the same as the landslides occurred on January 1959 and 1960, which caused the collapse of several houses and about 100 people were evacuated. This work presents a preliminary analysis of January 2019 landslide, based on geological surveys, aerial photos and very early
results of ground-based radar interferometry.
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