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Your search keyword '"Michéa, David"' showing total 12 results
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12 results on '"Michéa, David"'

3. Towards a Digital Twin for the Alps to simulate water-related processes and geohazards for climate change adaptation strategies.

Author

Malet, Jean-Philippe, primary, Lamare, Maxime, additional, Guardamino, Lucia, additional, Viehweger, Jonas, additional, Camici, Stefania, additional, Brocca, Luca, additional, Barbetta, Silvia, additional, Bonaccorsi, Bianca, additional, Modanesi, Sara, additional, Tarpanelli, Angelica, additional, Dall’Amico, Matteo, additional, Di Paolo, Federico, additional, Franceschetti, Nicolo, additional, Michoud, Clément, additional, Oppikoffer, Thierry, additional, Michéa, David, additional, Provost, Floriane, additional, Déprez, Aline, additional, Foumelis, Michaelis, additional, and Bally, Philippe, additional

Published
2024
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5. High-resolution co-seismic fault offsets of the 2023 Türkiye earthquake ruptures using satellite imagery.

Author

Provost, Floriane, Karabacak, Volkan, Malet, Jean-Philippe, Van der Woerd, Jérôme, Meghraoui, Mustapha, Masson, Frédéric, Ferry, Matthieu, Michéa, David, and Pointal, Elisabeth

Abstract

On February 6, 2023, southern Türkiye was struck by two large earthquakes at 01:17 UTC (Mw=7.8, Pazarcık, Kahramanmaraş) and 10:30 UTC (Mw = 7.6, Elbistan, Kahramanmaraş), causing severe damage at the complex junction of the Dead Sea Fault (DSF), the Cyprus Arc and the East Anatolian Fault Zone (EAFZ). The ruptures propagated along several known strands of the southwestern termination of the EAFZ, the main Pazarcık and Karasu valley faults, and the Çardak-Sürgü fault. Here we present the high-resolution mapping of the entire coseismic surface rupture and an estimate of the rupture width, total and on-fault offset, and diffuse deformation obtained a few days to three months after the two mainshocks. The mapping is derived from image correlation of Sentinel-2 optical satellite imagery and validated with offset measurements collected on the ground. We find that the ruptures extend over lengths of 310 km and 140 km for the Mw 7.8 and Mw 7.6 mainshocks, respectively. The maximum offsets reach 7.5 ± 0.8 m and 8.7 ± 0.8 m near the epicenters of the Mw 7.8 and Mw 7.6 events, respectively. We propose a segmentation of the two ruptures based on these observations, and further discuss the location of the potential supershear rupture. The use of optical image correlation, complemented by field investigations along earthquake faults, provides new insights into seismic hazard assessment. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Variability estimation in ground motion around Istanbul based on the probabilistic dynamic rupture scenarios along the North Anatolian fault

Author

Aochi, Hideo, Ulrich, Thomas, Michéa, David, Dupros, Fabrice, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), and IUGG

Subjects
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Abstract

International audience; Variability of ground motion estimation according to various earthquake scenarios is studied in the region of the Sea of Marmara around Istanbul, Turkey, through numerical simulations using a 3D finite-difference method with CPU-GPU implementation. The earthquake scenarios dynamically simulated based on mechanical models are given with probability according to the geological, geophysical and seismological hypotheses. We adopt a 3D geological model of the Sea of Marmara taken into account of the basin structure (down to about 10 km depth) and the existence of the Sea layer (1.5 km depth at max.). Although beneath the land part around the Sea of Marmara is briefly a 1D structure, the influence of the 3D structure of the basin on the ground motion caused by the earthquakes along the North Anatolian fault is significant. Various earthquake scenarios of a magnitude of about 7 lead to a very heterogeneous ground motion pattern. For the selected points, we carry out statistical analysis on its characterization. In Istanbul area, a very strong ground motion (peak ground velocity larger than 1 m/s) may not be the most probable scenario, but has a probability of a few percents in the case where the stress drop is extremely high enough to lead to a super-shear rupture propagation.

Published
2015

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