New insights into the local crust structure of Mt. Etna volcano from seismological and morphotectonic data

Guidi, Giorgio De; Scudero, Salvatore; Gresta, S.

doi:10.1016/j.jvolgeores.2012.02.001

Cited by 22 publications

(18 citation statements)

References 66 publications

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“…2) by several raised paleoshorelines, whose elevation measurement and radiocarbon dating indicated average uplift rates of 1.8 and 2.6 mm/year, respectively (Firth et al, 1996;Stewart et al, 1997;Antonioli et al, 2003Antonioli et al, , 2006Branca, 2003;Spampinato et al, 2012). This vertical deformation has been related to distinct sources: tectonic regional uplift, local deformation along faults and volcanic dome effect (De Guidi et al, 2012). Conversely, submerged manmade structures indicate historical collapse in the central coastal sector, which suffered a subsidence of 0.5-1.0 m in the last 60 years (Platania, 1905;Monaco et al, 2010;Carveni et al, 2011).…”

Section: Introductionmentioning

confidence: 92%

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Holocene vertical deformation along the coastal sector of Mt. Etna volcano (eastern Sicily, Italy): Implications on the time–space constrains of the volcano lateral sliding

Branca¹,

Guidi²,

Lanzafame³

et al. 2014

Journal of Geodynamics

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Section: Introductionmentioning

confidence: 92%

“…The current morphostructural framework of the volcanic edifice is the result of a complex interaction of magmatic processes with regional tectonics and flank instability processes (Monaco et al, 2010;De Guidi et al, 2012;Azzaro et al, 2013). The lower eastern flank of Mt.…”

Section: Stratigraphic and Structural Frameworkmentioning

confidence: 99%

Holocene vertical deformation along the coastal sector of Mt. Etna volcano (eastern Sicily, Italy): Implications on the time–space constrains of the volcano lateral sliding

Branca¹,

Guidi²,

Lanzafame³

et al. 2014

Journal of Geodynamics

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“…In this way, we obtained four areal seismic sources -three for the Timpe system and one for the Pernicana system (blue polygons in Fig. 4a) -respecting the homogeneity in terms of other seismological and geological features (M max , length and width, kinematics, slip rate; see also De Guidi et al, 2012).…”

Section: Area Seismic Sourcesmentioning

confidence: 99%

When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy – Part 1: Model components for sources parameterization

Azzaro

Barberi

D’Amico

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. The volcanic region of Mt. Etna (Sicily, Italy) represents a perfect lab for testing innovative approaches to seismic hazard assessment. This is largely due to the long record of historical and recent observations of seismic and tectonic phenomena, the high quality of various geophysical monitoring and particularly the rapid geodynamics clearly demonstrate some seismotectonic processes. We present here the model components and the procedures adopted for defining seismic sources to be used in a new generation of probabilistic seismic hazard assessment (PSHA), the first results and maps of which are presented in a companion paper, . The sources include, with increasing complexity, seismic zones, individual faults and gridded point sources that are obtained by integrating geological field data with long and short earthquake datasets (the historical macroseismic catalogue, which covers about 3 centuries, and a highquality instrumental location database for the last decades). The analysis of the frequency-magnitude distribution identifies two main fault systems within the volcanic complex featuring different seismic rates that are controlled essentially by volcano-tectonic processes. We discuss the variability of the mean occurrence times of major earthquakes along the main Etnean faults by using an historical approach and a purely geologic method. We derive a magnitude-size scaling relationship specifically for this volcanic area, which has been implemented into a recently developed software toolFiSH (Pace et al., 2016) -that we use to calculate the characteristic magnitudes and the related mean recurrence times expected for each fault. Results suggest that for the Mt. Etna area, the traditional assumptions of uniform and Poissonian seismicity can be relaxed; a time-dependent fault-based modeling, joined with a 3-D imaging of volcano-tectonic sources depicted by the recent instrumental seismicity, can therefore be implemented in PSHA maps. They can be relevant for the retrofitting of the existing building stock and for driving risk reduction interventions. These analyses do not account for regional M > 6 seismogenic sources which dominate the hazard over long return times (≥ 500 years).

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“…The overall tectonic setting is also made complex by other local sources of uplift, single fault segments, and volcano‐related processes. They involve crustal volumes with lateral dimensions up to few tens of kilometers and with activity rates highly variable in time [ Catalano et al ., ; Catalano and De Guidi , ; De Guidi et al ., , ].…”

Section: Quaternary Frameworkmentioning

confidence: 99%

Regional and local stress field orientation inferred from quantitative analyses of extension joints: Case study from southern Italy

2013

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[1] An intense tectonic activity in eastern Sicily and southern Calabria (Italy) is well documented by the differential uplift of Late Quaternary coastlines and by the record of the strong historical earthquakes. The extensional belt that crosses this area is dominated by a well-established WNW-ESE-oriented stretching direction. However, this area is largely lacking of any structural analysis for defining the tectonics at a more local scale. The analysis of systematic extension joint sets affecting Pleistocene deposits presented in this paper allows to infer the causative tectonic stress tensor by means of a quantitative inversion technique. Local perturbations of the first-order regional stress field are consequently recognized. Such perturbations are interpreted as due to interferences between large active faults and their particular geometrical setting. These results contribute to the understanding of the Quaternary tectonic evolution and the present-day stress regime.

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New insights into the local crust structure of Mt. Etna volcano from seismological and morphotectonic data

Cited by 22 publications

References 66 publications

Holocene vertical deformation along the coastal sector of Mt. Etna volcano (eastern Sicily, Italy): Implications on the time–space constrains of the volcano lateral sliding

Holocene vertical deformation along the coastal sector of Mt. Etna volcano (eastern Sicily, Italy): Implications on the time–space constrains of the volcano lateral sliding

When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy – Part 1: Model components for sources parameterization

Regional and local stress field orientation inferred from quantitative analyses of extension joints: Case study from southern Italy

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