Weathering grade in granitoid rocks: The San Giovanni in Fiore area (Calabria, Italy)

Borrelli, Luigi; Coniglio, Sabrina; Critelli, Salvatore; Barbera, Adriano La; Gullà, Giovanni

doi:10.1080/17445647.2015.1010742

Cited by 32 publications

(10 citation statements)

References 43 publications

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“…Due to the complex tectonic history of the Calabrian Arc, outcropping lithologies show different levels of fragmentation and deformation; in particular, the crystalline-metamorphic rocks are pervasively fractured (i.e. cross-cut by a complex fracture pattern related to regional and local-scale faults and fault zones developed during ancient and recent tectonic phases) and affected by intense and deep weathering processes, which produced a disintegration of the rock masses and a thick saprolite horizons, with depths up to 100 m (Cascini et al 1992;Le Pera and Sorriso-Valvo 2000;Calcaterra and Parise 2010;Borrelli, Critelli et al 2012;Borrelli, Perri et al 2014;Borrelli et al 2016;Biondino et al 2018;Ietto et al 2018).…”

Section: Geographical Geological and Geomorphological Featuresmentioning

confidence: 99%

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

Gullà

Conforti

Borrelli

2021

Geomatics, Natural Hazards and Risk

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Intense rainfall events often produce a great number of shallow landslides events, which in many cases can hits large areas or an entire regional territory. These slope instabilities cause damage to many roads, buildings, and infrastructures and often human loss. In these conditions, it is useful to refine shallow landslides susceptibility maps at regional scale progressively more reliable and efficacy. To take the highlighted goal it is opportune to promote the use of a circular approach that can considers knowledge (data, methods, models, solutions, etc.) constantly upgraded. To achieve this aims we propose a method that introduces structurally in a possible circular approach (progressive better results with constantly upgraded knowledge) the use of a comprehensive geo-database of shallow landslide events and related implemented through a collection and analysis of numerous sources, including published inventory maps, scientific literature, technical reports and newspapers, integrated by a multi-temporal interpretation of remote sensing images and several field surveys. The method is applied referring to the Calabria region, which is largely affected by this landslide category. The refined geo-database realized includes 22,028 shallow landslides, occurred between 1951 and 2017. The relationship between spatial pattern of the shallow landslides and the analyzed predisposing factors (lithological units, fault density, land use, drainage density, slope gradient, TWI, SPI and LS) showed that the high values of slope gradient, LS factor and drainage density, coupled to low values of TWI, displayed a strong control on the shallow landslide occurrence. The efficacy of the geo-database realization proves their usefulness in order to estimate and validate shallow landslide susceptibility map, which was optimally obtained applied a simple bivariate statistical method. The susceptibility map was classified into five classes and about 26% of the study area falls in high and very high susceptible classes and most of the shallow landslides mapped (76%) occur in the same classes. The AUC value of the prediction rate curve was 0.81, indicating a good prediction capability of the susceptibility map. The interaction between shallow landslide susceptibility map and road network map highlighted that the 20% of the roadways of the region area falls in high and very high ARTICLE HISTORY

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Section: Geographical Geological and Geomorphological Featuresmentioning

confidence: 99%

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

Gullà

Conforti

Borrelli

2021

Geomatics, Natural Hazards and Risk

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“…Classification and mapping of the weathering grade in outcrop (i.e. weathering grade field survey) are carried out through observation of geologically distinctive characteristics and several engineering geological tests (Borrelli, Coniglio, Critelli, La Barbera, & Gullà, 2015;Borrelli, Critelli, Gullà, and Muto, 2015;Cascini, Critelli, Di Nocera, Gullà, & Matano, 1992a;Matano & Di Nocera, 1999). In engineering geological studies on weathered rocks (e.g.…”

Section: Introductionmentioning

confidence: 99%

The interplay of structural pathway and weathering intensity in forming mass-wasting processes in deeply weathered gneissic rocks (Sila Massif, Calabria, Italy)

et al. 2018

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This paper presents a detailed map (Main Map) showing geology, tectonics, weathering intensity and spatial distribution of landslides in the San Pietro in Guarano study area (about 7.5 km 2 ), located in the north-western sector of Calabria (southern Italy). In this area, deeply weathered high-grade metamorphic rocks and different types/categories of mass movements are widespread. The Main Map, at 1:5000 scale, results from the combination of information gathered via analysis and interpretation of aerial photographs at different times and scales, multi-temporal geostructural and geomorphological surveys, field investigations and mapping of weathering grade in outcropthrough observation of geologically distinctive characteristics and qualitative and semi-quantitative engineering geological testsintegrated by means of the analysis of both weathering profiles on cutslopes and boreholes logs. The Main Map can represent a useful tool for authorities in charge of land-use planning and can profitably concur to typify landslides and to assess quantitative landslide risk.

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“…Borrelli, Perri, Critelli, & Gullà, 2012Borrelli, Critelli, Gulla, & Muto, 2015a;Borrelli, Coniglio, Critelli, La Barbera, & Gullà, 2015b). A total sample of 88 phenomena (LL, GASW, SK, and LS) were recognized and depicted on the map involving 200.65 km 2 corresponding to 9.85% of the surveyed area.…”

Section: Gravitational and Tectono-gravitational Phenomenamentioning

confidence: 99%

Seismotectonics and landslides of the Crati Graben (Calabrian Arc, Southern Italy)

et al. 2016

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The Crati Graben is a depression of Plio-Holocene age mainly controlled by extensional N-S striking faults and WNW-ESE transcurrent faults, in its northern and southern extremity. It is characterized by high landslide susceptibility due to the particular geo-structural pattern and seismotectonic characters. Landslides involve many villages, infrastructure and food crops, bringing serious economic and social damage. The seismotectonic and landslides Main Map of the Crati Graben, described in this paper, represents an update in detail of the framework of landslide risk areas and shows the main active and recent faults of the Crati Graben. The landslides and the faults, have been identified and classified, originally at detail scale (1:5000) and, then, represented at 1:50,000 scale. The geo-structural and geomorphological data were analysed in a geographic information system. The work has revealed a correlation between the trend of faults with respect to the distribution of landslides and of the historical and instrumental seismicity. The work presents an updated knowledge framework of risk conditions of the study zone, where risk areas related to slope instability are hierarchically classified according to the destructive potential of landslides. This document may be therefore a useful reference in planning and prioritising in the design of interventions for the safety of slopes and waterways.ARTICLE HISTORY

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Weathering grade in granitoid rocks: The San Giovanni in Fiore area (Calabria, Italy)

Cited by 32 publications

References 43 publications

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

The interplay of structural pathway and weathering intensity in forming mass-wasting processes in deeply weathered gneissic rocks (Sila Massif, Calabria, Italy)

Seismotectonics and landslides of the Crati Graben (Calabrian Arc, Southern Italy)

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