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. The Dinaric Fault System in western Slovenia, consistingof NW–SE-trending, right-lateral strike-slip faults, accommodates thenorthward motion of Adria with respect to Eurasia. These active faults showa clear imprint in the morphology, and some of them hosted moderateinstrumental earthquakes. However, it is largely unknown if the faults alsohad strong earthquakes in the late Quaternary. This hampers ourunderstanding of the regional tectonics and the seismic hazard. Geologicalevidence of co-seismic surface ruptures only exists for one historicalevent, the 1511 Idrija earthquake with a magnitude of ∼ M 6.8,but the causative fault is still disputed. Here we use geomorphologicaldata, near-surface geophysical surveys, and paleoseismological trenching tostudy two of these faults: the Predjama Fault and the Idrija Fault. In apaleoseismological trench across the Predjama Fault we found deformationfeatures that may have been caused by an earthquake between 13–0.7 ka,very likely not earlier than 8.4 ka. At the Idrija Fault, asurface-rupturing earthquake happened around 2.5 ka. We show thatinstrumental and historical seismicity data do not capture the strongestevents in this area.

Holocene surface-rupturing earthquakes on the Dinaric Fault System, western Slovenia