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Recent tectonic activity in the area of Swiebodzice Depression is recorded by the instruments of underground Geodynamic Laboratory (GL) of Space Reseach Centre, Polish Academy of Sciences (SRC PAS). Irregular in time tectonic events lasting dozen or so hours or several days have been watched by pendulums tiltmeters since 1974. Indications of tectonic activity such as tiltings of foundation and vertical motions are repeatedly observed by water-tube tiltmeters (WT). The effects of tectonic activity in the region of Ksiaz are visible in the geological structure of the orogen as well as deformations of Pelcznica Valley meander. Zones of discontinuity in the environment of undeground laboratory as well as objects of the castle were determined by geodetic measurements at established geodetic horizontal network and precise geological and structural identification. Geodetic horizontal network in underground corridors of GL was established in the first phases of the work. Construction of the network gives opportunity to designate the locations of faults and their projection onto the terrain map. The faults were measured by geodetic methods to determine their routes and dips. Simultaneously, works on identifying damages of Ksiaz Castle architectural objects were conducted, the appearance of which suggested connection with the activity of tectonic faults. Some worrisome cracks in the castle architectural objects can be seen in the structure of wall of St. George Tower, in the wall of Chestnut Terrace as well as in the western wall of terraces (fragments repeatedly repaired). It has been found that the zones of above-mentioned damages are approximately linear and in the azimuth close to the faults route directions. The tasks presented in publication represent initial part of the work, which is necessary for further progress of tectonic activity investigation in the Ksiaz area. In following research works focused on evaluation of the influence of tectonic activity on the castle architectural objects the two sources of information will be used, i.e. local information based on time series from GL and information from field measurements using geodetic research network.

acta geodynamica et geomaterialia

The damages of Ksiaz castle architecture in relation to routes of recognized tectonic faults and indications of recent tectonic activity of Swiebodzice Depression orogen - Central sudetes, SW Poland