Séminaire ISTerre

A perspective on earthquake cycle modelling

vendredi 31 janvier 2025 - 13h00
Pierre Romanet - La Sapienza, Università di Roma
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The modelling of earthquake cycle, including, the stress build up during inter-seismic stage, the nucleation of earthquakes or slow slip events, their propagation and their arrest before building up again the stress, has undergone rapid improvement over the last decade. However it can be difficult to apprehend the use, power, but also drawbacks and limitations of the current earthquake cycle models. A key limitation lies in the validation of numerical models, which is hindered by sparse or inaccessible observational/experimental data. While models may reproduce observed phenomena, their predictive capabilities remain constrained. In this presentation, I will illustrate by examples, different uses of earthquakes cycle models and how they can help us to better understand the underlying earthquake physics. • Complex fault geometry and fault networks By presenting theoretical models and numerical simulations, I will illustrate the existence of a scaling relationship between fault geometry and slip distribution. Additionally, I will discuss how this relationship enables the prediction of slip patterns in PMMA experiments on non-planar faults, highlighting the predictive potential of this scaling in controlled experimental settings. • Fluid injection and induced seismicity The second part of my talk, I will focus on examples relevant to fluid injection underground. Indeed, the growing demand for energy, that push for green energy development, and the need to mitigate carbon dioxide (CO2) emissions has led to the development of technologies that involve the injection of pressurised fluids into the subsurface, like Enhance Geothermal Systems (EGS) or Carbon Capture and Storage. While these technologies provide substantial benefits in energy production and environmental management, they also introduce risks, particularly the potential for inducing seismic events. Recently, we have developed a coupled Boundary Element/Finite Volume Method that can simulate the injection of fluid in a network of faults. We have used it to show that although slow-slip propagation and micro-seismicity propagation may look like diffusion process, it does not mean that it provides information on the fluid injection process. Through these examples, I aim to illustrate how earthquake cycle models can advance our understanding of fault dynamics and contribute to addressing critical challenges in society.

Equipe organisatrice : Mécanique des failles

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

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/92956342169?pwd=atRbmXkR3hcDaXyMw5rsnD8AbkUqdG.1

“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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