Abstract
We study the 1998 Bovec‐Krn mountain (Slovenia) earthquake sequence by combining hypocenters relocation, strong motion inversion, digital elevation modelling and field geology. The main shock (Ms=5.7), a 12 km right lateral strike‐slip event on the Dinaric fault system, occurred on a sub‐vertical fault plane. The rupture, confined between 3 and 9 km depth, with no evidence of surface faulting, propagated bilaterally within two structural barriers. The northwestern barrier is at the junction between Dinaric and Alpine structures where there is a sharp change in the geometry of faulting. The southeastern barrier is within the Dinaric system and its surface expression corresponds to the Tolminka‐spring perched basin, a 1 km restraining step‐over. At this site, the Bovec‐Krn earthquake‐fault overlaps with a 30 km strike‐slip fault segment that is free of aftershocks and could be undergoing an increase of stress. This fault system represents the northern branch of the Idrija right‐lateral fault.
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