Dear all, We cordially invite you to contribute to our session *TS3.11:* *"Earthquake mechanisms: Fluids or stress transfers?"* (EDI - ECS) https://meetingorganizer.copernicus.org/EGU23/session/46237 *ABSTRACTS SUBMISSION DEADLINE: 10th January 2023* * TS3.11 session description:* A sound comprehension of earthquake genesis and rupture propagation plays a significant part in evaluating seismic hazard. It is crucial to understand the processes and conditions causing the initial stages of rock failure at depth, and the interplay between mineral- and tectonic-scale processes. Both fluid percolation events and transformation-driven stress transfers are viable processes which can trigger mechanical instabilities ultimately causing rupture nucleation. There is still a lack of understanding regarding the exact conditions for earthquake nucleation and dynamic rupture propagation, including considerations on fracture mechanics under viscoelastic conditions, stress transfers, and/or fluid percolations. While observational methods help image mechanical instabilities, laboratory experiments provide insights on the physics of the lubrication processes enabling seismic faults to grow under pressure. However, there remains a significant gap in scientific discourse between the two schools of research. Therefore, we aim to bring researchers together to address these fundamental questions, opening doors between our respective expertise. This session aims to lead a transdisciplinary discussion and trigger unexpected collaborations between researchers from diverse fields. We encourage contributions from any discipline, including field geology, experimental petrology, mineral physics, thermodynamics, seismology, numerical modelling, geodesy and magnetotellurics. We will pay particular attention to abstracts from early-career researchers. This is an inclusive session that won’t accept any discrimination at any stage. *Important meeting information:* The EGU General Assembly 2023 (23-28 April) is announced as a hybrid event. We look forward to your contributions and hope to see many of you either in Vienna or online. Please do not hesitate to transfer this announcement around you. The goal is to trigger a constructive transdisciplinary discussion involving a diverse group of researchers. Best regards, Thomas P. Ferrand on behalf of all conveners *Conveners:* Thomas P. Ferrand (Freie Universität Berlin) Lisa Eberhard (Universiteit Utrecht ) Mattia Gilio (Università degli Studi di Pavia) Revathy Parameswaran (University of Alaska Fairbanks) -- *Dr. Thomas P. Ferrand* Research fellow of the *Alexander von Humboldt* Foundation Mineralogie-Petrologie - Fachbereich Geowissenschaften Freie Universität Berlin, Malteserstraße 74-100, 12249 Berlin (+49) 030 838 56029