Classical Russian pendulum seismometer S-5-S was modified for recording of the rotational components of ground motionaround the vertical or horizontal axes; the modified sensor is denoted here as S-5-SR. Experimental field testing of the S-5-SRsensor started in December 2010 in the Karvina coal region that is known as an area of intensive mining induced seismicity.First seismic station was installed in Doubrava village characterized by thick sedimentary layers. Next seismic station wasinstalled in Orlova village, in different local geological conditions, i.e. in region without sedimentary layers. More than200 mining induced seismic events were recorded on each seismic station during the period of six months of seismicmonitoring. The recorded wave patterns confirm the existence of rotational ground motion components in this region; thestrongest recorded value of this component exceeded 1 mrad.s-1. Analysis of the obtained records is presented in this paper.
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