1,721,041 research outputs found
geologia quantitativa e morfotettonica dell'area di Morlupo-Castelnuovo di Porto nei Monti sabatini (Lazio)
No full textStudio geomorfologico delle depressioni vulcaniche di Sacrofano e di baccano nei Monti sabatini
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Contributo dell’analisi geomorfica quantitativa allo studio dei processi di denudazione nel bacino idrografico del F. Paglia (Toscana meridionale-Lazio settentrionale).
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Geomorphologic features and radiocarbon dating of some quaternary deposits at Difesella del Trionto (Calabria, southern Italy).
No full textThe sedimentary deposits, Pleistocene in age, outcropping at Difesella del Trionto (Calabria) are examined. The main geologic and morphologic characters, along with the results of radiocarbon dating and organic geochemical analysis of some layer rich in organic carbon are reported. The results, strongly suggesting thet about 31,000 yr. B.P. a lake formed in the area, are in line with landsliding events which occurred downvalley of Difesella, as it is recorded by several morphologic feature. It is inferred that such processes triggered the valley damming. thus determining lacustrine sedimentation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Geomorphology and tectonics in the Roccamonfina Volcano (Campania-Central Italy)
No full textThis paper covers part of an extensive research program on the morphological and structural conditions of different volcanic complexes of Central Italy. The aim is to single out the relationships among the present landforms, their structural arrangement and the volcanic history of these areas. The Roccamonfina volcano is examined here; it belongs to the alkali-potassic province of Central Italy and was active between 650 ka BP and up to 50 ka BP. The morphological characteristics were examined through field survey and aerial photointerpretation. Successively all the morphological elements that might provide evidence for tectonic deformations were identified; the significant alignments of such elements and volcanic forms as well have been considered to be controlled by the surface effects of deep structural setting. Moreover the statistical analysis of stream directions have shown some preferential orientations indicating tectonic control. The analysis of the parameters amplitude of relief (Ar) and drainage density (D) allowed the identification of uplifted or lowered areas with respect to the surrounding ones. Morphological data integrated with volcanological and geological ones allowed the geomorphological evolution of the study area to be reconstructed. This evolution was strongly influenced by tectonic dislocations. NW-SE and NE-SW oriented. However, the surface effects of N-S and E-W trending tectonic directions are also discernible; these dislocations have cut the volcanic products and have conditioned the emplacement of lower order streams, thus testifying the important role they played in the very recent geomorphological evolution of the Roccamonfina area
Geomorphological and neotectonic evolution of the Umbria-Marche Ridge, northern sector.
No full textThe sequence of erosional surfaces and alluvial terraces there present points out the foundamental role played by regional uplift which starting from the Upper Pliocene, after the end of the main tectogenetic phase, involved the area. The genesis of alluvial deposits is referred to Plaistocene when, as a consequence of cold climates, debris material coming for bare slope overcharged rivers. They were subsequently incided by linear erosion, favored by climatic amelioration and vegetal covering of slopes which reduced debris production. Both the erosions surfaces and the older alluvial were variously displaced by recent tectonics which strongly affected also setting and evolution of drainage networks
Holocene environmental changes and their impact on anthropogenic activity: some examples from Italy
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