A new–old approach for shallow landslide analysis and susceptibility zoning in fine-grained weathered soils of southern Italy

Geomorphology ◽  
2015 ◽  
Vol 241 ◽  
pp. 371-381 ◽  
Author(s):  
Leonardo Cascini ◽  
Mariantonietta Ciurleo ◽  
Silvio Di Nocera ◽  
Giovanni Gullà
Keyword(s):  
Southern Italy ◽  
Shallow Landslide ◽  
Fine Grained ◽  
Weathered Soils

Electrical resistivity tomography investigations in the ufita Valley (southern Italy).

2008 ◽  
Vol 51 (1) ◽  
Author(s):  
A. Giocoli ◽  
C. Magrì ◽  
P. Vannoli ◽  
S. Piscitelli ◽  
E. Rizzo ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Southern Italy ◽  
Normal Fault ◽  
Fluvial Sediments ◽  
Resistivity Tomography ◽  
Fine Grained ◽  
Sedimentary Deposits ◽  
Lacustrine Deposits ◽  
Sedimentary Deposit

Several Electrical Resistivity Tomography (ERT) surveys have been carried out to study the subsurface structural and sedimentary settings of the upper Ufita River valley, and to evaluate their efficiency to distinguish the geological boundary between shallow Quaternary sedimentary deposits and clayey bedrock characterized by moderate resistivity contrast. Five shallow ERTs were carried out across a morphological scarp running at the foot of the northeastern slope of the valley. This valley shoulder is characterized by a set of triangular facets, that some authors associated to the presence of a SW-dipping normal fault. The geological studies allow us to interpret the shallow ERTs results obtaining a resistivity range for each Quaternary sedimentary deposit. The tomographies showed the geometrical relationships of alluvial and slope deposits, having a maximum thickness of 30-40 m, and the morphology of the bedrock. The resistivity range obtained for each sedimentary body has been used for calibrating the tomographic results of one 3560m-long deep ERT carried out across the deeper part of the intramountain depression with an investigation depth of about 170 m. The deep resistivity result highlighted the complex alluvial setting, characterized by alternating fine grained lacustrine deposits and coarser gravelly fluvial sediments.

scholarly journals Hydrodynamics in Evaporate-Bearing Fine-Grained Successions Investigated through an Interdisciplinary Approach: A Test Study in Southern Italy—Hydrogeological Behaviour of Heterogeneous Low-Permeability Media

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
E. Petrella ◽  
A. Bucci ◽  
K. Ogata ◽  
A. Zanini ◽  
G. Naclerio ◽  
...  
Keyword(s):  
Southern Italy ◽  
Interdisciplinary Approach ◽  
Flow Conditions ◽  
Hydraulic Connection ◽  
Fine Grained ◽  
Test Study ◽  
Aquifer Systems ◽  
Hydraulic Heterogeneity ◽  
Microbiological Data

Messinian evaporates are widely distributed in the Mediterranean Sea as outcropping sediments in small marginal basins and in marine cores. Progressive filling of subbasins led to the formation of complex aquifer systems in different regions where hypersaline and fresh water coexist and interact in different manner. It also generates a significant diversification of groundwater hydrochemical signature and different microbial communities. In the case study, the hydrogeology and hydrochemistry of the whole system are influenced by good hydraulic connection between the shallower pyroclastic horizon and the underlying evaporate-bearing fine-grained Messinian succession. This is demonstrated by the merge of hydrogeological, chemical, isotopic, and microbiological data. No mixing with deep ascending waters has been observed. As shown by geophysical, hydraulic, and microbiological investigations, the hydraulic heterogeneity of the Messinian bedrock, mainly due to karstified evaporitic interstrata/lenses, causes the hydraulic head to significantly vary with depth. Somewhere, the head increases with the depth’s increase and artesian flow conditions are locally observed. Moreover, the metagenomic investigations demonstrated the existence of a poor hydraulic connection within the evaporate-bearing fine-grained succession at metric and decametric scales, therefore leading to a patchwork of geochemical (and microbiological) subenvironments.

scholarly journals Rainfall thresholds for shallow landslide occurrence in Calabria, southern Italy

2014 ◽  
Vol 14 (2) ◽  
pp. 317-330 ◽  
Author(s):  
C. Vennari ◽  
S. L. Gariano ◽  
L. Antronico ◽  
M. T. Brunetti ◽  
G. Iovine ◽  
...  
Keyword(s):  
Southern Italy ◽  
Central Italy ◽  
Mediterranean Area ◽  
Shallow Landslide ◽  
Google Earth ◽  
Shallow Landslides ◽  
Rainfall Thresholds ◽  
Rainfall Events ◽  
Landslide Occurrence ◽  
Hourly Rainfall

Abstract. In many areas, rainfall is the primary trigger of landslides. Determining the rainfall conditions responsible for landslide occurrence is important, and may contribute to saving lives and properties. In a long-term national project for the definition of rainfall thresholds for possible landslide occurrence in Italy, we compiled a catalogue of 186 rainfall events that resulted in 251 shallow landslides in Calabria, southern Italy, from January 1996 to September 2011. Landslides were located geographically using Google Earth®, and were given a mapping and a temporal accuracy. We used the landslide information, and sub-hourly rainfall measurements obtained from two complementary networks of rain gauges, to determine cumulated event vs. rainfall duration (ED) thresholds for Calabria. For this purpose, we adopted an existing method used to prepare rainfall thresholds and to estimate their associated uncertainties in central Italy. The regional thresholds for Calabria were found to be nearly identical to previous ED thresholds for Calabria obtained using a reduced set of landslide information, and slightly higher than the ED thresholds obtained for central Italy. We segmented the regional catalogue of rainfall events with landslides in Calabria into lithology, soil regions, rainfall zones, and seasonal periods. The number of events in each subdivision was insufficient to determine reliable thresholds, but allowed for preliminary conclusions about the role of the environmental factors in the rainfall conditions responsible for shallow landslides in Calabria. We further segmented the regional catalogue based on administrative subdivisions used for hydro-meteorological monitoring and operational flood forecasting, and we determined separate ED thresholds for the Tyrrhenian and the Ionian coasts of Calabria. We expect the ED rainfall thresholds for Calabria to be used in regional and national landslide warning systems. The thresholds can also be used for landslide hazard and risk assessments, and for erosion and landscape evolution studies, in the study area and in similar physiographic regions in the Mediterranean area.

Calibration and validation of rainfall thresholds for shallow landslide forecasting in Sicily, southern Italy

Geomorphology ◽  
2015 ◽  
Vol 228 ◽  
pp. 653-665 ◽  
Author(s):  
S.L. Gariano ◽  
M.T. Brunetti ◽  
G. Iovine ◽  
M. Melillo ◽  
S. Peruccacci ◽  
...  
Keyword(s):  
Southern Italy ◽  
Shallow Landslide ◽  
Rainfall Thresholds ◽  
Calibration And Validation ◽  
Landslide Forecasting

scholarly journals Landslide Susceptibility Analysis by Applying TRIGRS to a Reliable Geotechnical Slope Model

Geosciences ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 18
Author(s):  
Mariantonietta Ciurleo ◽  
Settimio Ferlisi ◽  
Vito Foresta ◽  
Maria Clorinda Mandaglio ◽  
Nicola Moraci
Keyword(s):  
Landslide Susceptibility ◽  
Debris Flows ◽  
Input Data ◽  
Southern Italy ◽  
Scientific Literature ◽  
Shallow Landslide ◽  
Shallow Landslides ◽  
Predictive Capability ◽  
Performance Technique

This paper presents the results of a research aimed at analysing the susceptibility to shallow landslides of a study area in the Calabria region (Southern Italy). These shallow landslides, which in some cases evolve as debris flows, periodically affect the study area, causing damage to structures and infrastructure. The involved soils come from the weathering of gneissic rocks and cover about 60% of the study area. To fulfil the goal of the research, the Transient Rainfall Infiltration and Grid-based Slope-Stability (TRIGRS) model was first used, assuming input data (including physical and mechanical parameters of soils) provided by the scientific literature. Then, the preliminary results obtained were used to properly locate in situ investigations that included sampling. Geotechnical laboratory tests allowed characterising the investigated soils, and related parameters were used as new input data of the TRIGRS model. The generated shallow landslide susceptibility scenario showed a good predictive capability based on the adoption of a cutoff-independent performance technique.

Chemical and minero-petrographic features of Plio-Pleistocene fine-grained sediments in Calabria, southern Italy

2014 ◽  
Vol 133 (1) ◽  
pp. 101-115 ◽  
Author(s):  
Francesco Perri ◽  
Luigi Borrelli ◽  
Giovanni Gullà ◽  
Salvatore Critelli
Keyword(s):  
Southern Italy ◽  
Fine Grained

Fault rocks within the blueschist metabasalts of the Diamante–Terranova unit (southern Italy): potential fossil record of intermediate-depth subduction earthquakes

2019 ◽  
Vol 156 (10) ◽  
pp. 1771-1782 ◽  
Author(s):  
Stefano Vitale ◽  
Lorenzo Fedele ◽  
Francesco D’Assisi Tramparulo ◽  
Ernesto Paolo Prinzi
Keyword(s):  
Fossil Record ◽  
Southern Italy ◽  
Seismic Events ◽  
Molten Material ◽  
Diagnostic Features ◽  
Fault Rocks ◽  
Intermediate Depth ◽  
Fine Grained ◽  
Selective Preservation ◽  
Frictional Melting

AbstractWe report the first evidence of fault rocks (FRs) developed during high-pressure/low-temperature (HP/LT) subduction-related metamorphism, within quartz+epidote pods embedded in the glaucophane–lawsonite-bearing ophiolitic metabasalts of the Diamante–Terranova unit (Calabria, Italy). FRs occur as relic injections appearing as thin dark seams, locally showing an internal foliation characterized by tabular, curvilinear and meander-like shapes, and consist of very fine grains of glaucophane and titanite, locally including survivor clasts of epidote and lawsonite. Some boudinaged veins show glaucophane fibres in the boudin necks, marking a clear HP/LT syn-metamorphic origin at c. 30 km depth. The injected FRs can be alternatively interpreted either as pseudotachylytes or as fluidized ultracataclasites. Although subsequent recrystallization largely obliterated primary diagnostic features, the occurrence of (i) different-coloured flow streaks, characterized by alternating layers of glaucophane and titanite, (ii) well-developed flow folds and (iii) corroded epidote survivor crystals could indicate a viscous flow of molten material characterized by a non-uniform chemical composition. With this in mind, we support the hypothesis that these fine-grained veins were originally pseudotachylytes generated by the frictional melting of the glaucophane-rich layers of the Diamante–Terranova metabasalts, likely related to seismic events occurring during the Eocene along thrust faults within the subducting oceanic Ligurian lithosphere. The lack of evidence for pseudotachylyte relics in the metabasalt source rock argues for a selective preservation, largely dependent on the efficient mechanical shielding action of the stiffer quartz+epidote pods.

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