Brittle deformation during Alpine basal accretion and the origin of seismicity nests above the subduction interface

- Markers of paleo-seismicity in a subducted granulitic continental sliver.
- Early Eocene pseudotachylytes (c. 52 Ma) in the dry core of the unit.
- A major fault zone at the unit base with alternating brittle-ductile patterns.
- An example of a repeatedly breaking stiff asperity in the basal accretion site.