MEASUREMENTS OF TECTONIC MICRO-DISPLACEMENTS IN THE IDRIJA FAULT ZONE
Abstract
The Učja valley extends transversally to the 120 km long Idrija fault and was therefore selected as the most suitable for the installation of the TM 71 extensometer, which measures tectonic microdisplacements in 3D. Measurements on the crack within its inner fault zone have been conducted since 2004. In 14 years of observations a systematic horizontal displacements with an average rate of 0.21 mm/year and subordinate vertical displacements of 0.06 mm/year have been established, proving the activity of the Idrija fault in western Slovenia. An overview of different methods of displacement measurements related to active faults is given, with an overview of newer interdisciplinary investigations of the Idrija fault. Displacement rates are important not only for geodynamic interpretations, but also for improvements of seismotectonic models and thus for better seismic hazard assessment.
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