Search results for "Tectonic"

GENESIS AND GEOMORPHOLOGICAL EVOLUTION OF DEEP-SEATED GRAVITATIONAL SLOPE DEFORMATIONS: AN EXAMPLE OF DATING IN WESTERN SICILY

2010

The study area lies in the westernmost part of the Sicani Mountain range where a superposition of SE-trending, stacked, geological bodies crops out. this structure is the result of transpressive tectonic phases of Miocene and Lower Pliocene age. The neo-autochthon outcrops are made up of clay–marly deposits of the Middle–Upper Pliocene, and of calcarenites of Pleistocene age. The extensional Quaternary tectonic phases later dissected and dismembered the original structure, thus involving the calcarenites that show clear, mainly NE–SW oriented dislocations. Such calcarenites, which have a total thickness of about 80 metres, overlap the Belice marly-arenaceous formation. This determined favou…

Geothermal, hydro-structural and neo-tectonic features of the Sciacca basin

2012

LARGE LANDSLIDES AND NEOTECTONICS: A CASE STUDY IN WESTERN SICILY

2009

The study area is located in the western sector of the Sicanian Mounts where the superimposition, consequence of the Miocene and Lower Pliocene tectonic transpressive phases, of different geologic bodies, having vergence to the southern quadrants, can be observed. In this area, the neo-autochthonous deposits are given by marly-clayey sediments of middle-upper Pliocene, pertaining to the “Marnoso-arenacea” Formation of the Belice Valley, and by Pleistocene calcarenites. The recent extensional tectonic crisis (neotectonics) have further dissected and dismembered the original structural edifice, involving also the Pleistocene calcarenites, which show tectonic displacements mainly NE – SW orien…

STRATIGRAPHIC AND STRUCTURAL ANALYSIS OF A HIGH RESOLUTION SEISMIC SURVEY PERFORMED IN THE BAY OF AUGUSTA (SE SICILY)

2009

The Bay of Augusta is located along the NE margin of the Hyblean Plateau (SE Sicily). In this area a mostly bioclastic and terrigenous Quaternary succession outcrops. This area recorded a constant regional uplift rate of 50 kA. Two main groups of faults, referred to as the northwest and the southwest fault zones, are separated by a central zone where no evident fault planes have been imaged by seismic data. The faults in both groups strike from N30W to N52W and are also inferred to be steeply dipping. The faults pertaining to northwestern cluster show a very little offset, 50 kA. As concern the southeastern fault zone, results coming from radiocarbon age dating don’t have sufficient resolut…

Processo, progetto e architettura

2019

[EN] The concept of systematization is an innovative approach to the project that introduces a system of order with a method that proceeds by aggregating repeatable parts and regulates the phases of the design process. These principles can be found in the theories and experiments that lead to contemporary architecture, such as seriality, standardization, modularity that transform the project into a process and determine a new aesthetic. The works of the Fran Silvestre Arquitectos studio represent interesting examples that highlight the clarity of the process that operates through seriality and the definition of configurations based on dimensional relationships rather than on scale factors (…

Lo spazio collettivo nei contesti spontanei dell'abitare. La rigenerazione urbana e sociale di Bogotà e Medellììn

Assumendo l’inscindibilità della diade architettura-necessità, la ricerca volge il suo interesse nei confronti della dimensione collettiva dell’abitare, orientandosi specialmente verso quei contesti urbani e sociali emblematici laddove, alle trasformazioni indotte dall’evolversi della vita stessa, si sovrappongono problematiche incrinanti la possibilità di un vivere felice. In tali contesti più urgenti e bisognosi, l’architettura è concepita quale risposta concreta all’imprescindibile bisogno di abitare, e si rivela uno strumento capace di migliorare la qualità di vita della collettività, garantendo il bene comune ed incrementando il capitale sociale. Gli spazi collettivi, ritenuti la rispo…

Il diritto di visita entro i limiti della semplice ragione

2015

The right to visit of which Kant speaks in the “Third definitive article on perpetual peace” requires, precisely because of its theoretical framework, to be inscribed in a broader register, that is to say one that does not only concern the specifically political and legal aspects of the cosmopolitical project, but makes reference to the issue concerning the very sense in which the possession of reason can legitimately be referred to man. Only thus is it possible theoretically to access in an informed way the main sense of the Kantian cosmopolitical project and the theme of universal hospitality. And this is perhaps the way in which Kant himself, in responding to the urgent issues of his day…

Ornamento e Architettura. L'estetica funzionalistica di Louis H. Sullivan

2010

The present volume offers an introduction to and advances a new interpretation of the aesthetic of Louis Henry Sullivan(1856-1924). Sullivan is universally known as one of the most important American architects, possibly even the greatest one of the 19th century. Scholars of the Modern Movement have misinterpreted his motto “form follows function” and have hailed him as the “father of functionalism”. Sullivan, however, attributed to the concepts of “form”, “function” and “suitability” a higher and more poetic meaning than the other architects of the Chicago School, among whom the debate on such issues, as related to Gottfried Semper’s theories and evolutionist doctrines, was quite heated. N…

Granular packings and fault zones

2000

The failure of a two-dimensional packing of elastic grains is analyzed using a numerical model. The packing fails through formation of shear bands or faults. During failure there is a separation of the system into two grain-packing states. In a shear band, local ``rotating bearings'' are spontaneously formed. The bearing state is favored in a shear band because it has a low stiffness against shearing. The ``seismic activity'' distribution in the packing has the same characteristics as that of the earthquake distribution in tectonic faults. The directions of the principal stresses in a bearing are reminiscent of those found at the San Andreas Fault.

Transition from thin- to thick-skinned tectonics and consequences for nappe formation: Numerical simulations and applications to the Helvetic nappe s…

2015

Abstract We use two-dimensional numerical simulations to study the deformation style and the formation of nappes during the shortening of basement–cover systems with half-grabens. We perform simulations with only linear and power-law viscous rheology, and also thermo-mechanical simulations with viscoelastoplastic rheology and temperature-dependent viscosities. The accumulated, area-averaged strain is calculated for the sediments, es, and for the basement, eb, to quantify the deformation style. The results show that the transition from thin-skinned dominated (es/eb > 1) to thick-skinned dominated (es/eb ≤ 1) deformation is controlled by two effective viscosity ratios: the ratio of viscosity …