Comparative study of geological and GPS research of reactivated fractures in the north of Silesia (NE part of the Bohemian Massif, Czech Republic)
Abstrakt
In this paper author compares two different approaches in the study of the fault reactivation - geological measurements and long time GPS monitoring. Both approaches were applied in the area of Javornický výběžek in the north of Silesia.
This area is characterized by several important geological boundaries represented by faults of the Sudetic (NW-SE) and the Moravo-Silesian (NE-SW) directions, e.g. the Sudetic Marginal fault (SMF), the Ramzová overthrust, Nýznerov fault zone. Almost all faults are of variscian age and were subsequently reactivated.
The geological approach consisted of standard structural measurements of orientation of faults and joints, lineation and/or other kinematic indicator (steps etc.) have been applied on almost forty localities in the area. The data were processed using Daisy3 4.71.06 software (Salvini 2008) and results displayed into a map of the area.
This map points to the system of reactivated fractures in the area. The GPS data were collected for more than ten years in the area by the Institute of Rock Structure and Mechanics Czech Academy of Sciences.
The GPS investigations confirm the recent movements along important faults in northern Silesia (Schenk et. al. 2002). The data from the nine surrounding GPS stations both permanent and epoch were averaged.
The average movement of each station was corrected using an average movement in the area and displayed in another map of the area. The second map characterizes recent movements in the studied area.
The results provided by both methods were compared, discussed and displayed.