Gravitational collapse of Mount Etna’s southeastern flank

Urlaub, Morelia; Petersen, Florian; Groß, Felix; Bonforte, Alessandro; Puglisi, Giuseppe; Guglielmino, Francesco; Krastel, Sebastian; Lange, Dietrich; Kopp, Heidrun

doi:10.1126/sciadv.aat9700

Cited by 74 publications

(55 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Geophysical Research Letters Solaro et al, 2010;Urulaub et al, 2018). The unstable sector is confined to the north by the Pernicana Fault System (PFS; Ruch et al, 2013) and to the west by the Ragalna Fault System (RFS; Neri et al, 2007), whereas to the south it is bordered by more faults (Figure 1a).…”

Section: 1029/2019gl082467mentioning

confidence: 99%

“…The subhorizontal‐lateral migration of magma from the central conduit (Bousquet & Lanzafame, ), confirmed by flow indicators exposed along dikes in the Valle del Bove (VdB; Ferrari et al, ), is accompanied by shallow (1–2 km) seismicity lasting from a few hours to days (Patanè et al, ). The interaction between regional stress, dike‐induced rifting, and gravity force is the cause of a continuous and roughly eastward and downslope motion of Mount Etna eastern flank, which has been interpreted as the effect of the volcano spreading (Acocella & Neri, ; Apuani et al, ; Borgia et al, ; Groppelli & Tibaldi, ; Lundgren et al, ; Neri et al, ; Palano et al, ; Solaro et al, ; Urulaub et al, ). The unstable sector is confined to the north by the Pernicana Fault System (PFS; Ruch et al, ) and to the west by the Ragalna Fault System (RFS; Neri et al, ), whereas to the south it is bordered by more faults (Figure a).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DInSAR Analysis and Analytical Modeling of Mount Etna Displacements: The December 2018 Volcano‐Tectonic Crisis

Novellis

Atzori

Luca

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

We investigate the 24–27 December 2018 eruption of Mount Etna occurred from fissures located on the volcano eastern flank and accompanied by a seismic swarm, which was triggered by the magma intrusion and continued for weeks after the end of the eruption. Moreover, this swarm involved some of the shallow volcano‐tectonic structures located on the Mount Etna flanks and culminated on 26 December with the strongest event (ML 4.8), occurred along the Fiandaca Fault. In this work, we analyze seismological data and Sentinel‐1 Differential Interferometric Synthetic Aperture Radar (DInSAR) measurements, the latter inverted through analytical modeling. Our results suggest that a dike source intruded, promoting the opening of the eruptive fissures fed by a shallower dike. Moreover, our findings indicate that the activation of faults in different sectors of the volcano may be considered as a response to accommodate the deformations induced by the magma volumes injection.

show abstract

Section: 1029/2019gl082467mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DInSAR Analysis and Analytical Modeling of Mount Etna Displacements: The December 2018 Volcano‐Tectonic Crisis

Novellis

Atzori

Luca

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Overall, local geodynamic processes at Mt. Etna are due to the interaction between regional tectonic stresses, volcano dynamics (inflation due to magma uprising, dyke intrusions) and flank instability [6][7][8] . Most of the seismically active faults are located in the eastern flank of the volcano: the Timpe Faults System consists of a number of up to 9 km-long parallel east-facing step-faults ( Fig.…”

Section: Background and Summarymentioning

confidence: 99%

“…Systematic field measurements have been collected between 28 December 2018 and 18 January 2019. With regard to this difficult task, we point out that the assessment of coseismic slip through a geological survey (that is, within a few minutes from the origin time of the earthquake) is impractical, and any surface measurement contains a portion of afterslip, whatever its relative magnitude, even in a complex combination with background creeping processes [6][7][8][9][10] . However, we can consider those surface ruptures as representative of the coseismic surface slip (i.e.…”

Section: Background and Summarymentioning

confidence: 99%

Surface ruptures database related to the 26 December 2018, MW 4.9 Mt. Etna earthquake, southern Italy

et al. 2020

View full text Add to dashboard Cite

We provide a database of the surface ruptures produced by the 26 December 2018 Mw 4.9 earthquake that struck the eastern flank of Mt. Etna volcano in Sicily (southern Italy). Despite its relatively small magnitude, this shallow earthquake caused about 8 km of surface faulting, along the trace of the NNWtrending active Fiandaca Fault. Detailed field surveys have been performed in the epicentral area to map the ruptures and to characterize their kinematics. The surface ruptures show a dominant right-oblique sense of displacement with an average slip of about 0.09 m and a maximum value of 0.35 m. We have parsed and organized all observations in a concise database, with 932 homogeneous georeferenced records. The Fiandaca Fault is part of the complex active Timpe faults system affecting the eastern flank of Etna, and its seismic history indicates a prominent surface-faulting potential. Therefore, this database is essential for unravelling the seismotectonics of shallow earthquakes in volcanic areas, and contributes updating empirical scaling regressions that relate magnitude and extent of surface faulting.

show abstract

“…In this area, the hazard due to crustal seismicity represents an important component of the total S-PTHA (Sørensen et al 2012;Selva et al 2016). One should eventually consider also hazard from non-seismic sources (e.g., Tonini et al 2011;Grezio et al 2012Grezio et al , 2015Urlaub et al 2018;Paris et al 2019). As a further simplification in comparison to the TSUMAPS-NEAM model, we consider a narrower range of alternative models to describe the epistemic uncertainty, both as far as the seismicity rates and the inundation models are concerned.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shallow Slip Amplification Uncertainty on Probabilistic Tsunami Hazard Analysis in Subduction Zones: Use of Long-Term Balanced Stochastic Slip Models

Scala

Lorito

Romano

et al. 2019

Pure Appl. Geophys.

View full text Add to dashboard Cite

The complexity of coseismic slip distributions influences the tsunami hazard posed by local and, to a certain extent, distant tsunami sources. Large slip concentrated in shallow patches was observed in recent tsunamigenic earthquakes, possibly due to dynamic amplification near the free surface, variable frictional conditions or other factors. We propose a method for incorporating enhanced shallow slip for subduction earthquakes while preventing systematic slip excess at shallow depths over one or more seismic cycles. The method uses the classic k-2 stochastic slip distributions, augmented by shallow slip amplification. It is necessary for deep events with lower slip to occur more often than shallow ones with amplified slip to balance the long-term cumulative slip. We evaluate the impact of this approach on tsunami hazard in the central and eastern Mediterranean Sea adopting a realistic 3D geometry for three subduction zones, by using it to model * 150,000 earthquakes with M w from 6.0 to 9.0. We combine earthquake rates, depth-dependent slip distributions, tsunami modeling, and epistemic uncertainty through an ensemble modeling technique. We found that the mean hazard curves obtained with our method show enhanced probabilities for larger inundation heights as compared to the curves derived from depthindependent slip distributions. Our approach is completely general and can be applied to any subduction zone in the world.

show abstract

Gravitational collapse of Mount Etna’s southeastern flank

Abstract: Gravitational collapse of Mount Etna’s SE flank: New seafloor geodetic data capture active displacement of underwater volcanic flank.

Cited by 74 publications

References 40 publications

DInSAR Analysis and Analytical Modeling of Mount Etna Displacements: The December 2018 Volcano‐Tectonic Crisis

DInSAR Analysis and Analytical Modeling of Mount Etna Displacements: The December 2018 Volcano‐Tectonic Crisis

Surface ruptures database related to the 26 December 2018, MW 4.9 Mt. Etna earthquake, southern Italy

Effect of Shallow Slip Amplification Uncertainty on Probabilistic Tsunami Hazard Analysis in Subduction Zones: Use of Long-Term Balanced Stochastic Slip Models

Contact Info

Product

Resources

About