Articles | Volume 15, issue 8
https://doi.org/10.5194/se-15-965-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-15-965-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Aug 2024
Research article |
| 09 Aug 2024
| 09 Aug 2024
Interseismic and long-term deformation of southeastern Sicily driven by the Ionian slab roll-back
Amélie Viger
CORRESPONDING AUTHOR
CNRS, Montpellier Université – Géosciences Montpellier, Montpellier, France
Stéphane Dominguez
CNRS, Montpellier Université – Géosciences Montpellier, Montpellier, France
Stéphane Mazzotti
CNRS, Montpellier Université – Géosciences Montpellier, Montpellier, France
Michel Peyret
CNRS, Montpellier Université – Géosciences Montpellier, Montpellier, France
Maxime Henriquet
CEREGE, Aix-Marseille Université, Aix-en-Provence, France
Giovanni Barreca
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Sezione di Science della Terra, Università di Catania, Catania, Italy
CRUST – Interuniversity Center for 3D Seismotectonics with territorial applications, Chieti, Italy
Istituto Nazionale di Geofisica e Vulcanologia – Osservatorio Etneo, Catania, Italy
Carmelo Monaco
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Sezione di Science della Terra, Università di Catania, Catania, Italy
CRUST – Interuniversity Center for 3D Seismotectonics with territorial applications, Chieti, Italy
Istituto Nazionale di Geofisica e Vulcanologia – Osservatorio Etneo, Catania, Italy
Adrien Damon
CNRS, Montpellier Université – Géosciences Montpellier, Montpellier, France
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Using novel geophysical datasets, we reassess the slip rate of the Morne Piton fault (Lesser Antilles) at 0.2 mm yr−1 by dividing by four previous estimations and thus increasing the earthquake time recurrence and lowering the associated hazard. We evaluate a plausible magnitude for a potential seismic event of Mw 6.5 ± 0.5. Our multi-segment tsunami model representative of the worst-case scenario gives an overview of tsunami generation if all the fault segments ruptured together.
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In glaciated regions, induced lithosphere deformation is proposed as a key process contributing to fault activity and seismicity. We study the impact of this effect on fault activity in the Western Alps. We show that the response to the last glaciation explains a major part of the geodetic strain rates but does not drive or promote the observed seismicity. Thus, seismic hazard studies in the Western Alps require detailed modeling of the glacial isostatic adjustment (GIA) transient impact.
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Publication in SE not foreseen
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Glacial Isostatic Adjustment is considered as a major process of seismicity in intraplate regions such as Scandinavia and eastern North America. We show that GIA associated with the alpine icecap induces a present-day response in vertical motion and horizontal deformation seen in GNSS strain rate field. We show that GIA induced stress is opposite to strain rate, with the paradoxical consequence that postglacial rebound in the Western Alps can explain the strain rate field but not the seismicity.
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Short summary
New satellite geodetic data (PS-InSAR) evidence a generalized subsidence and an eastward tilting of southeastern Sicily combined with a local relative uplift along its eastern coast. We perform flexural and elastic modeling and show that the slab pull force induced by the Ionian slab roll-back and extrado deformation reproduce the measured surface deformation. Finally, we propose an original seismic cycle model that is mainly driven by the southward migration of the Ionian slab roll-back.
New satellite geodetic data (PS-InSAR) evidence a generalized subsidence and an eastward tilting...
