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The volcano-tectonic map of Etna volcano, 1:100.000 scale: an integrated approach based on a morphotectonic analysis from high-resolution DEM constrained by geologic, active faulting and seismotectonic data

Azzaro, Raffaele and Branca, Stefano and Gwinner, Klaus and Coltelli, Mauro (2012) The volcano-tectonic map of Etna volcano, 1:100.000 scale: an integrated approach based on a morphotectonic analysis from high-resolution DEM constrained by geologic, active faulting and seismotectonic data. Italian Journal of Geosciences, 131 (1), pp. 153-170. Societa Geologica Italiana. DOI: 10.3301/IJG.2011.29

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Abstract

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.

Item URL in elib:https://elib.dlr.de/80312/
Document Type:Article
Title:The volcano-tectonic map of Etna volcano, 1:100.000 scale: an integrated approach based on a morphotectonic analysis from high-resolution DEM constrained by geologic, active faulting and seismotectonic data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Azzaro, RaffaeleIstituto Nazionale di Geofisica e Vulcanologia, OsservatorioUNSPECIFIED
Branca, StefanoIstituto Nazionale di Geofisica e Vulcanologia, OsservatorioUNSPECIFIED
Gwinner, Klausklaus.gwinner (at) dlr.deUNSPECIFIED
Coltelli, MauroIstituto Nazionale di Geofisica e Vulcanologia, OsservatorioUNSPECIFIED
Date:2012
Journal or Publication Title:Italian Journal of Geosciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:131
DOI :10.3301/IJG.2011.29
Page Range:pp. 153-170
Publisher:Societa Geologica Italiana
Status:Published
Keywords:Etna, DEM, digital photogrammetry, morphotectonics, volcano-tectonic landforms, active tectonics, seismotectonic model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Gwinner, Klaus
Deposited On:08 Jan 2013 10:08
Last Modified:06 Sep 2019 15:21

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