Nenavadno plitvo lezenje Idrijskega preloma poleti 2025

The Idrija Fault, a dextral strike-slip structure crossing the karstified carbonate Dinarides, exhibits complex shallow deformation strongly influenced by hydrological processes. Two Hall-effect creepmeters installed 8 km apart at Oblakov vrh and Kanomlja recorded abrupt shallow slip events of 0.15–0.50 mm during summer 2025. These slip episodes lasted up to 40 hours, consistent with creeping behavior and occurred without any accompanying seismicity, with regional earthquake magnitudes and frequencies remaining low. The last significant events were the 1998 and 2004 Posočje earthquakes. The observed deformation patterns cannot be explained by uniform tectonic slip and instead indicate different local mechanisms, including rainfall-driven pore-pressure diffusion, barometric pressure changes, karstic fluid pathways, and possibly shallow mass movement, that act along the fault. The observations highlight the strong coupling between hydrology, karst processes, and shallow fault mechanics, demonstrating that to some degree environmental controls dominate near-surface fault deformation on the Idrija Fault.