MONITORING OF TECTONICALLY ACTIVE AREA OF BOCHNIA

Geodynamic studies on tectonic activity in the region of the Polish Carpathians have been carried out by many years with insufficient results. They were usually evaluated from geological data and particular approaches led to ambiguous, different or contradictory conclusions. The authors discuss displacements in the area of Bochnia evaluated from underground measurements as well. The deformations observed are linked to old mining. However the characteristics of the deformations can not be explained by mining effects alone. The horizontal displacements and deformation of shafts in Bochnia correspond to similar effects observed in the Wieliczka salt mine; there is a northward tendency despite the differences between its geological and mining environments. The direction of this tendency corresponds to the orientation of tectonic stress and the orientation of tectonic structures. The authors draw conclusions about the modern geophysical methods to be applied in the research into the tectonic activity of the area. According to the authors reliable investigations should be carried out both on the surface (GNSS) and underground with the use of a combination of geophysical and geodetic methods: strainmeter measurements, clinometers etc. These methods provide reliable permanent observations of stress-strain variations - essential for filtering data to allow a separation of the non tectonic components and for determining the linearity or non-linearity of tectonic processes in real time. New type of data will be investigated by using the results of deformations permanently monitored by geophysical and geodetic methods.