Task manager: Louis de Barros (Géoazur)
Participants: Laurent Stehly (Géoazur), Frédéric Cappa (Géoazur), Mai-Linh Doan (ISTerre)
Experts: Yves Guglielmi (CEREGE), Chris Bean (UC Dublin), Eric Larose (ISTerre)
Objectives: The experimental centerpiece of this project is the development of a unique in-situ experiment under controlled mechanical and hydraulic conditions monitored with a dense and high-resolution network of fluid pressure, mechanical displacement and seismic wave measurements. The main idea is to increase the fluid pressure in the fault zone to activate it at a metric scale. Two rupture behaviors are expected: (1) brittle rupture, with tectonic-like event emission and (2) slow-slip with tremor-like generation. The objectives are: (1) to acquire high-precision datasets (micro-seismicity, medium changes and deformation) associated with the fault hydraulic response in a continuous range going from static to several kHz, (2) to analyse jointly these data in order to assess the processes occurring in the fault, and (3) to derive empirical relationships which will be tested through numerical simulations (Task 3) and upscaled to crustal faults (Task 4).