Publication Date:
2017-04-04
Description:
We describe the slope processes acting on Camaldoli Hill, the main volcanic feature of the Neapolitan area whose geological
evolution and setting have been reconstructed. The backbone of the hill includes the remnants of two partially superposed tuff
cones, lying between the Campanian Ignimbrite (CI) and the Neapolitan Yellow Tuff (NYT). This sequence is mantled by
pyroclastic, anthropogenic and epiclastic deposits, with abrupt thickness and facies variations. The structural setting of the hill
mainly results from several phases of reactivation of the CI caldera faults which were active until about 9.5 ka. Deformation
younger than 15 ka is evidenced by landslide deposits, caused by slope instability from volcano-tectonism, and by a high-angle
erosional unconformity, formed in response to a base-level lowering. A stratigraphic analysis of the reworked deposits at the foot of
the slopes allowed us to define both depositional mechanisms and sedimentation rates. The results of combined volcanological,
geomorphological and engineering-geological studies permitted us to constrain and quantify past geological processes and
hypothesis about the future evolution of the hill. Present-day slope processes on Camaldoli Hill are largely controlled by the
presence of weathered and reworked deposits, whose nature and thickness have been analysed and mapped in detail. Four main
kinds of slope processes have been recognized: falls and toppling failures from NYT; small-scale slides in the weathered and
pedogenized loose cover; mixed events, represented by slides evolving to hyperconcentrated flows, mud flows and debris flows;
and areal and linear erosion. Consequently, a high number of mass movements not previously documented have been mapped. At
the same time, an insight into the sedimentation rate due to the overall slope processes, covering a time-span of about 5 ka, was
given. Some final considerations regarding landslide hazard are presented in the context of the most suitable remedial works.
Description:
Published
Description:
132–157
Description:
3.5. Geologia e storia dei sistemi vulcanici
Description:
4.4. Scenari e mitigazione del rischio ambientale
Description:
JCR Journal
Description:
reserved
Keywords:
Slope processes
;
Weathering
;
Volcaniclastic rocks
;
Hazard
;
Risk
;
04. Solid Earth::04.04. Geology::04.04.03. Geomorphology
;
04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry
;
04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport
;
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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