In addition to that, the structure of the Ostrava-Karvina coalfield
is characterized by two dominant tectonic styles to the west and to the east from the NNE-SSW striking Orlovd structure.
The area of concern of Block 7 of Mine Plant 1, Lazy site, is located in the Karvina part of the Ostrava-Karvina Coalfield
(OKR), in the southern part of Orlova vicinity--see Figure 1.
During the measurement in 2015 mostly records of mining induced seismic events form the Ostrava-Karvina Coalfield and from Poland were evaluated, as well as quarry blasts from nearby quarries.
These included mining induced seismic events from the Ostrava-Karvina Coalfield (epicentral distances 22-30 km), mining induced seismic events from the Polish part of Upper Silesian Coal Basin (epicentral distances 30-70 km) and mining induced seismic events from Lubin in Poland (epicenral distance approximately 230 km).
In the first phase, frequency analysis was performed for the five events selected, with different epicentral distances and from different azimuth--mining induced events from Poland (one event from Lubin and one event from the Upper Silesian Coal Basin), mining induced event from the locality of the Darkov Mine (Ostrava-Karvina Coalfield) with the energy 2.6E+05 J (according to the Database of Green Gas, DPB a.s.) and two quarry blasts from the quarries near Kajlovec and Jakubcovice nad Odrou (Fig.
and Zamazal, R.: 1992, Local seismic network in southern part of the Ostrava-Karvina Coalfield
. Acta Montana, Series A, No.
In order to generalize such interpretations, it is necessary to supplement the measurement of recent stresses carried out in the Ostrava-Karvina Coalfield
, because the present network of measurements is infrequent and unequal.
At the end of 1993, the task "Complex HW and SW equipment of the seismological centre and its link with individual collieres of the Ostrava-Karvina Coalfield" came to an end, and its results were considered to be positive (Slavik, 1993).
and Konicek, P.: 2007, Selected geological factors impacting effects of induced seismicity on surface in conditions of Ostrava-Karvina coalfield in the Czech Republic.
Holecko, J.: 2010, New seismic network for monitoring of influence of mining seismicity on the surface in Ostrava-Karvina Coalfield. Documenta Geonica 2010/1, UGN AV CR, Ostrava, 115-125, (in Czech).
In the Ostrava-Karvina Coalfield
, these effects are determined with the Budryk-Knothe method and are presented with the form of iso-lines of subsidence on the surface, usually first prior to the commencement of exploitation, i.e.
and Zamazal, R.: 1992a, Local seismic network in the southern part of the Ostrava-Karvina Coalfield
. Acta Montana, ser.