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This paper presents some preliminary results and remarks on site effect at the locality of the seismic station Ostrava-Krasne Pole (OKC) which is part of the Czech regional seismological network. Short-term seismological measurements were realized simultaneously at two sites with different geological conditions using two identical seismic apparatuses GAIA Vistec and seismometers Lennartz LE3D/5s within the frequency range of 0.2 - 50 Hz. Station "ST1" located in an experimental gallery represents a rock site formed by Carboniferous layers, while station "ST2" situated in a seismic cellar represents soil site with Quaternary sediments whose thickness amounts to roughly 16.5 m. Seismic events and ambient noise recorded at stations ST1 and ST2 are analysed by three different spectral ratio methods - SSR, HVSR and HVNR and determined frequencies and amplifications are then compared. Analysed data set includes mainly mining induced seismic events from the Czech Republic (Ostrava-Karvina Coalfield) and mining induced seismic events from the Poland (Upper Silesian Coal Basin and Lubin).

Experimental measurement at the seismic station Ostrava-Krasne Pole (OKC): preliminary results and remarks on site effect at the studied locality