Search results for " earthquake"
showing 10 items of 81 documents
Monochromatic Long-Period Seismicity Prior to the 2012 Earthquake Swarm at Little Sitkin Volcano, Alaska
2021
Detection of the earliest stages of unrest is one of the most challenging and yet critically needed aspects of volcano monitoring. We investigate a sequence of five unusual long-period (LP) earthquakes that occurred in the days prior to the onset of a months-long volcano-tectonic (VT) earthquake swarm beneath Little Sitkin volcano in the Aleutian Islands during late 2012. The long-period earthquakes had two distinctive characteristics: their signals were dominated by a monochromatic spectral peak at approximately 0.57 Hz and they had impulsive P and S-wave arrivals on a seismometer located on Amchitka Island 80 km to the southeast of the volcano. In each case, the monochromatic earthquakes …
Seismotectonics of the active thrust front in southwestern Sicily: hints on the Belice and Selinunte seismogenic sources
2014
We present a seismotectonic model of the active thrust front in western Sicily, which includes the area hit by the 1968 Belice earthquake sequence. The ~40 km long South-WEstern Sicilian Thrust (SWEST) is formed by two aligned albeit non-parallel fault arrays, the Granitola-Castelevetrano Thrust System (GCTS) in the west and the Partanna- Poggioreale Thrust System (PPTS) in the east. The ~NE-SW trending, NW-dipping GCTS straddles from the Pelagian coastline to Castelvetrano, is ~18 km long and composed of two segments, with the northern, ~12 km long one showing geodetic and geologic evidence of active deformation (Barreca et al., 2014). The segment is marked by a sharp gradient in Different…
Experimental characterization of friction properties of materials for innovative beam-to-column dissipative connection for low-damage RC structures
2023
Low-damage design of structures in seismic-prone areas is becoming an efficient strategy to obtain "earthquake-proof" buildings, i.e. buildings that, even in the case of severe seismic actions, experience a low or negligible amount of damage. Besides the safeguard of human lives, this design strategy aims also to limit the downtime of buildings, which represents a significant source of economic loss, and to ensure an immediate occupancy in the aftermath of an earthquake. In this context, focusing on moment-resisting frames (MRFs), several solutions have been developed for the beam-to-column connections (BCCs) of steel and precast/prestressed concrete structures, but very few for cast-in-sit…
Innovative connections for steel-concrete-trussed beams: a patented solution
2023
The most recent design strategies welcome the adoption of innovative techniques for seismic energy input mitigation, aiming to achieve high dissipation capacity, prevent the structure from collapse and ensure the serviceability of the construction. Friction damper devices have been widely adopted in framed steel structures for decades, while their introduction in different structural types is still under investigation. This paper presents the outcomes of innovative research supported by the industry and conducted on beam-to-column connections of RC structures in which the beams are Hybrid Steel-Trussed Concrete Beams (HSTCBs) and the columns are classical RC pillars. An innovative solution,…
Placemaking in rural areas. New town Gibellina
2016
In Belice Valley, in 1968, after the earthquake, due to the generally poor life conditions, people losing their homes, and a rather not very present State, popular mobilisation was the choice. In the post-earthquake reconstruction, the self-organisation process came back in vogue due to the previous example of Danilo Dolci's action in western Sicily, during the fifties. The Mayor Ludovico Corrao also referred to the revolutionary roots of Dolci's movement, including those values in his dream of city's rebirth, involved inhabitants, artists, and architects to "make the town".
The ‘false vaults’ in the architecture of Sicily
2015
Between the end of the 17th century and the first decades of the 18th, Sicily was struck by several violent earthquakes. The total and partial collapse of monumental buildings produced a global debate involving various aspects of construction practice. One of the central topics of discussion was the construction of domes and large vaulted structures. Some architects studied the possibility of using so-called ‘false vaults’, a kind of lightweight structure created with a wooden frame, reed mats, and plaster. The technique was probably known by the 16th century and was used in a few major monuments, such as the dome of the Palermo Cathedral, in the mid-17th century. It was only after the Eart…
Gli ingegneri camerali in Sicilia dopo il terremoto del 1823
2016
La memoria intende indagare, attraverso lo studio delle fonti bibliografiche e soprattutto di una copiosa documentazione archivistica, il ruolo determinante svolto dalle istituzioni attraverso l’attività degli ingegneri camerali, tecnici alle dirette dipendenze dell’amministrazione regia, tra i quali emergono alcuni tra i professionisti più attivi del tempo quali Luigi Speranza, Giuseppe Patti e Alessandro Emmanuele Marvuglia. Questi ultimi vennero incaricati di effettuare numerosi sopralluoghi nelle zone colpite dal terremoto al fine di valutare e monitorare i danni, redigendo sia quadri di carattere generale relativi ai singoli centri, che perizie di dettaglio volte all’accertamento dei d…
Restauri in Sicilia: gli interventi sui beni architettonici danneggiati dal terremoto del 1968 nella Valle del Belice
2020
Questo contributo mira ad integrare lo scenario culturale delle eterogenee esperienze incluse nella sessione “Protezione, pratica, codici e norme” del secondo Convegno Internazionale della SIRA Società Italiana per il Restauro dell’Architettura. L’articolato ventaglio dei casi studio, che spazia dal tema della tutela dei siti d’interesse ambientale alle normative settoriali in Italia e Francia, ed include le questioni tecniche e metodologiche riguardanti il cantiere di restauro, è completato dall’esperienza del restauro dei beni architettonici nei centri urbani danneggiati dal terremoto che interessa la valle del Belice in Sicilia nel 1968. Dopo aver inquadrato i luoghi danneggiati dal viol…
Belice Anno Zero. Il restauro dei monumenti distrutti dal terremoto del 1968 nella valle del Belice in Sicilia
2020
Il contributo analizza alcuni degli interventi condotti sui beni architettonici dei centri abitati nella vallata del fiume Belice che nel 1968 vennero interessati dagli effetti distruttivi del terremoto registrato in Sicilia. The contribution critically frames some of the interventions carried out on the architectural heritage of the villages in the Belice valley which in 1968 were affected by the destructive effects of the earthquake recorded in Sicily.