Séminaire ISTerre

Impact of Past and Current Climatic Forcings on High Mountain Hazards

mercredi 29 mai 2024 - 10h00
Benjamin Lehmann  - séminaire post-doc (café 9h45 salle convivialité)
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In high mountain regions, which are home to approximately 10% of the world's population, climate change is causing glacier retreat and permafrost degradation, thereby creating natural hazards for ecosystems and local societies. However, the study and monitoring of gravity-driven hazards related to the cryosphere remain limited. Understanding the mechanisms controlling the geomorphological response to climate changes and the associated hazards is crucial for anticipating the impacts of climate change and preparing a sustainable future for Andean societies. This response includes a long-term perspective, over scales of 1,000 to 10,000 years, concerning glacial fluctuations and associated topographical conditioning, as well as a recent impact of climate change, over scales of 10 to 100 years, manifested by glacier retreat and permafrost degradation. My work focuses on quantifying the geomorphological response of high mountain landscapes to past and current climate changes. The objective is to better understand the dynamics of associated hazards and resources. I approach this issue through a multidisciplinary methodological approach adapted to high mountain geomorphology, combining field measurements, remote sensing, geochronology, and numerical modeling. This approach allows for an integrated understanding in space and time of the geomorphological evolution of high mountain environments, particularly cliffs and slopes, covered and rock glaciers, as well as gravity-driven instabilities. Thus, I reconstruct the activity of rock glaciers and the history of cliff erosion. The objective is (i) to extract (paleo-)climatic data, (ii) to characterize the factors controlling cliff erosion, and (iii) to quantify the evolution of permafrost and water resources in high mountain areas. Finally, I study the hazard of rock-ice avalanches by quantifying their spatial distribution, frequency, and magnitude, in close relation to past climatic oscillations, covering the Holocene to the Late Pleistocene. The primary question is: can geomorphological archives help explain the increase in current instabilities and predict future hazards?

Equipe organisatrice : Organisation labo

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

“Minimalist seismology”: studying earthquakes with sparse instrumentation

jeudi 17 septembre 2026 - 11h00

Mathieu Causse - ISTerre

Equipe organisatrice : Organisation labo

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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Stable‑to‑dynamic expansion of fault slipping area through fluid injection observed in laboratory experiments using a sub‑meter scale specimen

vendredi 18 septembre 2026 - 14h00

Takatoshi Ito  - Université de Tohoku, Japan

Equipe organisatrice : Mécanique des failles

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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Tectonics, Mantle Dynamics and Coupled Lithosphere-Mantle-Core Evolution of Earth and Other Rocky Worlds

jeudi 24 septembre 2026 - 11h00

Paul Tackley - ETH Zurich

Equipe organisatrice : Grands Séminaires ISTerre

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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Tectonics, Mantle Dynamics and Coupled Lithosphere-Mantle-Core Evolution of Earth and Other Rocky Worlds

jeudi 24 septembre 2026 - 11h00

Paul Tackley - ETH Zurich

Equipe organisatrice : Grands Séminaires ISTerre

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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Apport des expériences analogiques pour la modélisation et le suivi en temps réel de la propagation du magma en profondeur : Exemple du Rift Est Africain

jeudi 1er octobre 2026 - 11h00

Virginie Pinel - ISTerre

Equipe organisatrice : Organisation labo

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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A t-on encore besoin de plaques pour expliquer la tectonique de la vallée du Rhône et des Alpes Occidentales ?

vendredi 2 octobre 2026 - 11h00

philippe VERNANT - Geosciences Montpellier

Equipe organisatrice : Tectonique active et sismicité

Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères

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TBA

vendredi 2 octobre 2026 - 14h00

Hugo Boulze - 

Equipe organisatrice : Cycle sismique et déformations transitoires

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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TBA

vendredi 9 octobre 2026 - 11h00

Eric Beaucé - ISTerre

Equipe organisatrice : Cycle sismique et déformations transitoires

Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères

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TBA

vendredi 20 novembre 2026 - 11h00

Farzaneh Mohammadi - ENS Paris

Equipe organisatrice : Cycle sismique et déformations transitoires

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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