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Mass movements related to tectonics in the Aspromonte massif (southern Italy)
No full textGeomorphic and structural studies have been carried out on the headwaters of Vallone Colella Torrent, in an area intensely affected by mass-movement phenomena on the Aspromonte massif of southern Italy. Rock types outcropping in the area are mostly gneiss and granitoids, with subordinate presence of metarenites, phyllites, and biotite schists; all lithologies experienced low-grade metamorphism, as indicated by petrographic analysis. Structural surveys, performed at macroscopic and mesoscopic scale, allowed recognition of several sets of discontinuities related to different deformation events. The upper reaches of Vallone Colella Torrent present a large, active landslide zone, the debris materials of which feed the debris flows along the drainage system towards the main valley. Mass-movement phenomena are both shallow and deep-seated; the latter are limited to a sector of the study area, while shallow processes are present throughout the landslide zone. Some considerations of the relationship between tectonics and mass movement are presented, with particular reference to the presence of a large-scale downthrown wedge (bounded by structural surfaces on both sides of the valley), located in the same area affected by deep-seated phenomena
Le deformazioni gravitative profonde di versante come limiti alla pianificazione territoriale.
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Saggi di Cartografia geomorfologica ad indirizzo applicativo. Examples of applied geomorphological mapping. Carta n. 9 - Costa di Cetraro
No full textThe proposed legend for applied geomorphology aims to unify the various methods of cartographic representation of natural and anthropic phenomena for a correct hazard assessment related to the morphogenetic processes in risk and vulnerability conditions. The legend is organized to be used extensively not only by researchers but also by professionals, in order to prepare thematic maps for environmental studies, soil protection, and land use planning. In this legend landforms and deposits are distinguished according to their morphogenetic agents, mechanisms and activity (active, dormant, inactive). There are also informations on the linear and spatial dimensions and, when possible, on volumetric and chronologic data. Some data and correct representation of surface deposits are also given based on their texture, thickness, form, etc. For a correct use of the proposed symbols, the legend is completed by the «Explanatory Notes » which clarify the symbol use in case of doubtful applications. Some case studies are also presented to show how the legend should be used in various italians environments
The December 1982 Ancona landslide: a case of deep-seated gravitational slope deformation evolving at unsteady rate.
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