Search results for " Geografia"
showing 10 items of 829 documents
Landslide susceptibility zonation by exploiting GIS tools and two statistical methods: binary logistic regression and multivariate adaptive regressio…
2013
In the recent years advanced statistical methods and GIS tools have been frequently used to assess landslide susceptibility. The latter is estimated by establishing statistical relationships between landscape characteristics and spatial distribution of past slope-failures. These are mapped mainly by recognizing changes on slope morphology produced by gravity. Despite of this, most of the researches on landslide susceptibility do not consider that slope-failures modify topography and associate high probability of landsliding with topographic characteristics that differ from those that led slope-failures. In this research we analyzed landslide susceptibility in the basin of the Malvello river…
Assessment of Gully Erosion Susceptibility Using Multivariate Adaptive Regression Splines and Accounting for Terrain Connectivity
2017
In this work, we assessed gully erosion susceptibility in two adjacent cultivated catchments of Sicily (Italy) by employing multivariate adaptive regression splines and a set of geo-environmental variables. To explore the influence of hydrological connectivity on gully occurrence, we measured the changes of performance occurred when adding one by one nine predictors reflecting terrain connectivity to a base model that included contributing area and slope gradient. Receiver operating characteristic (ROC) curves and the area under the ROC curve were used to evaluate model performance. Gully predictive models were trained in both the catchments and submitted to internal (in the calibration cat…
Predicting Earthquake-Induced Landslides by Using a Stochastic Modeling Approach: A Case Study of the 2001 El Salvador Coseismic Landslides
2023
In January and February 2001, El Salvador was hit by two strong earthquakes that triggered thousands of landslides, causing 1259 fatalities and extensive damage. The analysis of aerial and SPOT-4 satellite images allowed us to map 6491 coseismic landslides, mainly debris slides and flows that occurred in volcanic epiclastites and pyroclastites. Four different multivariate adaptive regression splines (MARS) models were produced using different predictors and landslide inventories which contain slope failures triggered by an extreme rainfall event in 2009 and those induced by the earthquakes of 2001. In a predictive analysis, three validation scenarios were employed: the first and the second …
Factor selection procedures in a Google Earthtm aided landslide susceptibility model: application to the Beiro river basin (Spain)
2011
A procedure to select the controlling factors connected to the slope instability has been defined. It allowed to assess the landslide susceptibility in the Rio Beiro basin (about 10 km2) over the north-eastern area of the city of Granada (Spain). Field and remote (Google EarthTM) recognition techniques allowed to generate a landslide inventory consisting in 127 phenomena. Univariate tests, using both association coefficients and validation results of single parameter susceptibility models, allowed to select among 15 controlling factors the ones that resulted as good predictor variables; these have been combined for unique conditions analysis and susceptibility maps were finally prepared. In…
“The (anti-)establishment blues”: la doppia geografia di Sixto Rodriguez tra marginalità e sovversione
2016
The life and career of Sixto Rodríguez, the American folk-singer born in Detroit in 1942, weave together two different places. On the one hand, we find Detroit where at the turn of the Sixties Rodríguez recorded two albums without success. On the other, there is Cape Town where unknown to Rodríguez his music became very influential and its subversive contents found an unexpected space of resonance. This paper aims at investigating the double geography emerging from this astonishing musical biography. The analysis will focus on the complex relationship between musical practices and spatial formations, examining how power geometries shape and carve the field of their mutual production. If the…
Volcanic risk and the role of the media. A case study in the Etna area
2019
On December 24, 2018, the Etna volcano has recorded a significant eruption. Linked to this phenomenon, after a seismic swarm of 72 shocks, a 4.8-magnitude earthquake struck a large area North of Catania city, on the Eastern coast of Sicily. Six villages reported 28 injured people and damages to the building. According to seismologists the earthquake had an unusual level of magnitude. Yet, despite the real danger of this event, many people who live around the volcano, in one of the most densely populated areas of Sicily, perceived these facts in an ambivalent way. Indeed, their lives continued as before even in awareness of the natural hazard, while several media presented the situation as r…
Nuovi percorsi di ricerca geografica: il caso di Caltabellotta
2011
L'articolo si prefigge l'obiettivo di descrivere quantitativamente e qualitativamente il territorio di Caltabellotta, nel tentativo di decostruire alcuni stereotipi legati all'arretratezza e mutare l'immagine tradizionale del luogo. È ingiusto considerare Caltabellotta un paese in crisi, vecchio e ostile ai cambiamenti (né bisogna illudersi che sia vero l’esatto opposto). Occorre invece superare lo stereotipo territoriale e cominciare a guardare alla realtà locale senza pregiudizi, cercando di valorizzare i punti di forza piuttosto che ribattere all’infinito sulle stesse criticità.
Mappare la qualità della vita a Palermo: gli stili di vita di un centro storico che cambia
2020
Il centro storico di Palermo sta attraversando, negli ultimi anni, cambiamenti significativi tanto dal punto di vista fisico quanto per la sua composizione sociale. L’ormai pluridecennale processo di gentrification, iniziato alla fine degli anni ’90, si è intersecato negli ultimi anni con un incremento delle presenze turistiche, dovute anche a grandi eventi (Capitale Italiana della Cultura, Manifesta), e con la forte presenza di cittadini stranieri residenti. Questo contesto così eterogeneo e complesso induce a riflettere sulla questione delle politiche di inclusione, che emerge ogniqualvolta si prendono in considerazione i grandi cambiamenti di composizione sociale e le conseguenti dinamic…
Movescapes. Geografie del movimento fra spazio e rappresentazione
2013
This project has three main aims. First, it seeks to rethink space and spatiality from movement. To do this it follows some significant steps of philosophical tradition (Aristotle, Hegel, Heidegger, Merleau Ponty, Derrida, etc.) in an attempt to demonstrate the close relation between the movement of body and the production of space. No space would exist without an original movement producing it: the body comes out of himself, it spaces, and it is precisely in this dislocation that the spatiality is brought into being (Merleau Ponty). Bodies in motion produce space, but what happens if these bodies fall between the lines of a text or on the planes of a map? Can representational spaces hold t…
Análisis interno del arte levantino: la composición y el espacio a partir de la sistematización del núcleo Valltorta-Gasulla.
2005
Uno de los rasgos más significativos del Arte Levantino es la repetida ocupación de los abrigos al aire libre como lugar de representación. La multiplicación de fases o campañas decorativas, con modos distintos de abordar el diseño de las figuras, su distribución en el espacio e, incluso, las propias temáticas representadas son, sin duda, exponente de una realidad cambiante que es preciso descifrar.En efecto, los paneles levantinos encierran la lectura de un proceso de uso y socialización de estos espacios como lugares de representación a lo largo de un período de tiempo todavía impreciso. Estas pinturas son, en definitiva, el reflejo gráfico de la dinámica de ocupación, control y movimient…