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Basic information is given about the installation of monitoring instrumentation in W part of Slovenia where measurements started at the beginning of 2004. The measurement is carried out with the use of a verified, very stable and sensitive deformeter TM71. Four instruments were installed either directly in or in the close vicinity of major Dinaric faults in karst cave or on the surface. The place for the fifth instrument is selected on the Kneža fault, south of the Ravne fault, where the measurements will start in 2005. Introductory monitoring shows displacements within 0, 04 mm. Both devices in Postojna cave system recorded the same reaction on the July 12, 2004 earthquake. These were movements changing the trend in strike slip (y-axis) with magnitude around 0, 03 mm and angular deviation in horizontal plane xy within 0, 02/200 that occurred before or during the earthquake.