Séminaire de Marion Thomas, ISTEP, Sorbonne Université, Paris

Active Faults Behavior: on the Importance of Considering the Fault Zone structure

Séminaire de Marion Thomas, 2019

Résumé

Geophysical data have documented the high spatial and temporal variability of fault slip modes. In the seismogenic depth range, slip rate on faults span a continuum ranging from mm/yr to m/s . Yet, the physics of the processes that control these behaviors  remains  poorly understood.  This severely limits our ability to assess the  potential size, magnitude and recurrence of earthquakes on active faults. The research approach undertaken tends to cut across traditional disciplinary bounds and promote multidisciplinary studies using field observations, geodetic measurements, laboratory experiments as well as numerical studies to better understand the evolution of fault zone properties and associated processes occurring during fault slip. We will discuss the importance of taking into account the main fault plane and the surrounding medium as a continuously evolving coupled system to highlight what controls seismic and aseismic slip and better assess seismic hazard.