Search results for "Earthquake"
showing 10 items of 174 documents
Traditional Architecture and seismic security. Earthquake in the Madonie inner mountain area of Sicily: damages and construction techniques
2017
Tra il 1818 e il 1819 una serie di centri siciliani concentrati nell'area montuosa delle Madonie, furono colpiti a più riprese da una sequenza di scosse sismiche che provocarono numerosi danni all’edificato storico, sia diffuso che di pregio. Il contributo intende indagare i danni e le conseguenti ricostruzioni, con particolare riferimento alle tipologie edilizie e alle tecniche costruttive adottate prima e dopo il sisma. L'azione di verifica e monitoraggio delle condizioni delle fabbriche e i conseguenti interventi di consolidamento e riparazione sono efficacemente documentati in testi a stampa e nei report coevi al sisma e –soprattutto- da una copiosa documentazione archivistica. Si ident…
A complex thrust sequence in western Himalaya: the active Medlicott Wadia Thrust.
2017
15 pages; International audience; The recent activity of the Medlicott-Wadia Thrust (MWT) is investigated by geomorphic and tectonic studies in the Riasi zone, south of the Pir Panjal range (India, Jammu-Kasmir state of western Himalaya). In the Riasi area, the MWT forms a splay of five faults that dip northward. The recent activity of the splay is quantified using a set of deformed Quaternary alluvial units. The central branch of the thrust splay moved Precambrian limestones above Quaternary sediments and is sealed by 36 ± 3 ka (youngest OSL age) deposits. The other branches offset the top of a 15 ± 1 ka (youngest OSL age) alluvial fan by 180 to 120 m; the two southernmost branches form 17…
Analysis of the 2011 Japan's triple disaster from a conceptual ontology of the domain of risk and disaster,
2012
International audience; In this paper, we propose to use the factual part of a conceptual ontology realized in 2009 (Provitolo and al. 2009 a) to analyze the disaster that occurred in Japan on 11 March 2011 and which was characterized by a sequence of earthquake, tsunami and nuclear accident. Many papers, reports, videos and press articles were published, each one providing a wide variety of information. Some fo- cused on the massive earthquake that triggered the devastating tsunami waves along the eastern coast of the Tohoku region while others mainly analyzed the nuclear crisis. The aim of this work is to syn- thesize in visual form information from various sources and to produce differen…
Coseismic extension recorded within the damage zone of the Vado di Ferruccio Thrust Fault, Central Apennines, Italy
2018
Recent high resolution hypocentral localisation along active fault systems in the Central Apennines illuminates the activation of seismogenic volumes dipping at low angle (<30°) in extensional settings overprinting contractional deformations affecting the continental crust of the Adria microplate. Individuation of the geological structures and of the fault processes associated with these seismic patterns will contribute to the interpretation of seismic sequence evolution, and seismic hazard studies.Here we report field and microstructural evidence of seismogenic extensional faults localized within pre-existing thrust fault zones. The Vado di Ferruccio Thrust Fault (VFTF) is a narrow …
A damage identification procedure based on Hilbert transform: Experimental validation
2010
SUMMARY This paper aims at validating the feasibility of an identification procedure, based on the use of the Hilbert transform, by means of experimental tests for shear-type multi-degree-of-freedom systems. Particularly, a three-degree-of-freedom frame will be studied either numerically or experimentally by means of a laboratory scale model built at the laboratory of the Structural, Aerospace and Geotechnical Engineering Department (DISAG) of University of Palermo. Several damage scenarios have been considered to prove the effectiveness of the procedure. Moreover, the experimental tests have been conducted by considering two different input loads: pulse forces, simulated by means of an ins…
An algorithm for earthquakes clustering based on maximum likelihood
2007
In this paper we propose a clustering technique set up to separate and find out the two main components of seismicity: the background seismicity and the triggered one. We suppose that a seismic catalogue is the realization of a non homogeneous space-time Poisson clustered process, with a different parametrization for the intensity function of the Poisson-type component and of the clustered (triggered) component. The method here proposed assigns each earthquake to the cluster of earthquakes, or to the set of independent events, according to the increment to the likelihood function, computed using the conditional intensity function estimated by maximum likelihood methods and iteratively chang…
L'abitare in pratica. Esperimenti nel post-sisma di Configno e Capricchia
2021
The seismic sequence that struck central Italy in 2016-2017 triggered intense de- and reterritorialization processes. This paper examines the cases of Capricchia and Configno (Amatrice, RI) where, with the active participation of non-residents owners of second homes, the communities have undergone autonomous processes in order to not abandon the place of residence while waiting for the institutional emergency solutions. Based on the perspective of social geography, this paper intends to analyze the bottom-up reterritorialization processes and open the discussion on the value and legitimacy of intervention of non-resident subjects.
Chiese colonnari e tiranti metallici (Palermo XVI-XVII secolo)
2014
The churches with aisles of arches and columns are an archetype of Sicilian architecture. From the Middle Ages to the 18th century, the preference for this plan resulted in experiments, evolutions and tests concerned with the science of building in a land exposed to the danger of earthquakes. Contrary to the recommendations dispensed and disseminated by the most authoritative treatises, the cases presented illustrate how metal tie-rods were used at construction sites in Palermo during the Modern Age when building these constructions. These elements were able to counter the thrust generated by the arches and vaults or caused by earthquakes on slender and isolated vertical structures like col…
Il terremoto del 1823 in Sicilia settentrionale: danni e ricostruzioni
2016
Il 5 marzo 1823 si verificò un terremoto che investì gran parte della Sicilia settentrionale. Numerosi danni si verificarono a Palermo, nelle aree limitrofe a sud e ovest della capitale, in alcuni centri delle Madonie e nelle zone situate lungo il litorale e l’immediato entroterra tirrenico da Palermo a Patti (in particolare a Naso). Il contributo intende indagare, attraverso lo studio delle opere degli autori coevi al sisma e soprattutto di una copiosa documentazione archivistica, le modalità attraverso le quali ci si raffrontò con i problemi determinati dal terremoto, dalla gestione dell'emergenza, all'analisi dei danni e delle successive ricostruzioni. Dal quadro tracciato emerge in part…
Terremoto e architettura storica. Palermo e il sisma del 1726.
2015
On September 1st 1726 Palermo was hit by a violent earthquake. Although it did not bring about the destruction of the city, the earthquake caused widespread and extensive damage to the architectural heritage. The local insti- tutions carried out a series of actions involving representatives of the technical culture. These actions affected the subsequent appearance of the urban pattern and influenced the construction methods of the time. Crossing the data taken from chronicles of the time, from maps produced after the earthquake and above all copious archival documents, the research aims to reconstruct the state in which Palermo was after that tragic event, highlighting a number of aspects. …