Publication Date:
2020-11-20
Description:
A new volcano-tectonic map of Etna volcano has been compiled
through a morphotectonic analysis performed with detailed field
mapping, high-resolution DEM and orthoimages, constrained by
seismotectonic data. In this study, we present a homogeneous mapping
of the volcano-tectonic and tectonic elements on the whole volcano,
consistent with the updated knowledge on the geology and
active tectonics observed in historical times. Details of the tectonic
features occurring in the lower-middle part of the volcanic edifice,
namely the more densely urbanized areas, are described; volcanic
elements such as eruptive fissures, caldera and flank collapse rims
affecting the upper sectors, are also reported. All the volcanic landforms
of Etna edifice have been generated by constructive and
destructive volcanic processes largely during the last 15 ka activity of
Mongibello volcano. DEM-derived images (e.g. slope and aspect
maps) were produced and interpreted in order to identify faultrelated
surface features based on an explicit list of well-known elements
of tectonic geomorphology. Subsequently, the morphotectonic
mapping has been compared with field data on geologic
marker offsets, as well as evidence of surface faulting, including
coseismic displacements and creeping of historical and recent
events. This combined approach has enabled classifying each element
reported in the map as (i) exposed faults, (ii) buried faults and
(iii) hidden faults. The analysis of slip-rates confirms the exceptional
dynamics of the Pernicana fault, which is characterised by an almost
constant slip-rate of 20-36 mm/a over the last 1000 years, while the
Timpe fault zone and the structural system in the southern flank
accommodate a relevant amount of deformation with slip-rates
reported to range of ca. 2-4 mm/a. Finally, a seismotectonic model summarises
the information regarding seismic hazard, with reference to
the additional, potentially severe effects induced by surface faulting.
Description:
Published
Description:
153-170
Description:
3.2. Tettonica attiva
Description:
JCR Journal
Description:
restricted
Keywords:
Etna, DEM, digital photogrammetry, morphotectonics,
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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