Jana Rušajová

Institute of Geonics AS CR · seismology

Analysis of initial seismological observations at the newly established seismic station at Pražmo in Beskydy Mountains is presented in this study. The PRAZ station represents the easternmost station at the territory of the Czech Republic currently and it is supposed that this station will contribute to detection of mining induced events from the Up...

We analysed the anomalously excited microseisms at the OKC seismic station (Czech Republic) during the period between 2007 – 2011. We showed that the time distribution of the anomalous microsesims is similar to the LOD (Length Of the Day) variations. The biggest number of anomalous microsesisms was excited in the period when LOD (differential) was...

This paper presents some preliminary results and remarks on site effect at the locality of the seismic station Ostrava-Krásné 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 apparatus...

The paper is intended as an analysis of particle velocity generated during rockbursts in deep coal mines in the Ostrava-Karviná Coal Basin (OKCB), which are recorded at five underground seismic stations. On the other hand, we realized field measurements in open-pit coal and shale mines in northwestern and central Bohemia in the course of blasting o...

This document is considered as essential material, which comprehensively summarizes and specifies the possible sources of generation of microseisms that were found during our long-term experimental observations and analyses of the characteristics of secondary microseisms. We started the detail analyses of microseisms recorded at the solitary broad...

Annual drift is typical for microseisms. We propose a model based on thermoelastic wave generation that explains the highest microseisms during winter using higher stress level at the same time. If we remove the average influence of the background stress from the microseisms, we obtain the residual microseisms, which show the semiannual periods wit...

The annual drift is typical for microseisms. We propose the model based on the generation of thermoelastic waves, which explains the highest microseisms during winter by higher stress level in the same time. If we remove the average influence of the stress background from the microseisms, we obtain the residua of microseisms, which show the semiann...

The basic scientific question of this study was: do other mechanisms exist for excitation of secondary microseisms aside from the widely accepted mechanism by non-linear interactions of respective ocean waves. Here we use continuous broad-band data from secondary microseisms recorded at the Ostrava-Krásné Pole, Czech Republic (OKC) seismic station...

The noise data obtained from new apparatus for indirect stress measurement, i.e., vertical static pendulum was compared with microseisms recorded at the seismic station OKC (Czech Republic). It was documented that results of both methods of measurement were comparable, being estimated by a high value of correlation coefficient. The microseismic ano...

The aim of this paper is to present the results of an investigation of induced seismic events which occurred during mining in the coalfields of Plants Paskov and Staříč of the Paskov Mine which belong to the southern part of the Ostrava-Karviná coal mines. Some results obtained in the time period January 1992 - December 2002 have already been publi...

This paper is devoted to a complex review of various monitoring networks operating in the eastern part of the Ostrava- Karviná Coal Basin. In the first place, there were systems for monitoring seismoacoustic emissions during coal extraction. Later a local seismic network was installed which encompasses partial arrays of seismic stations located in...

As a consequence of geomechanical and geotechnical conditions and also anthropogenic activities in mines of the Ostrava-Karviná Coal Basin (Czech Republic) rockbursts have been recognized to be a serious seismic risk. Therefore, local as well as regional monitoring arrays were deployed there in order to investigate the actual seismic activity conti...

The deformation waves, which were created during the strongest earthquakes, were traced on their way around the globe. These deformation waves follow the focal mechanisms and start after the mainshocks. The deformation waves after the Chile earthquake on February 27, 2010 (M=8.8) and the Mentawai earthquake (Indonesia) on October 25, 2010 (M=7.7) u...

The paper presents some results of seismic experiments carried out on the territory of northern Moravia and Silesia, roughly delimited by the coordinates 16°E–19°E and 49°N–51°N. The experiments were aimed at compiling a velocity model of the uppermost Earth’s crust using the database of arrival times of Pg and Sg waves recorded at a fairly large n...

The paper presents some results of in-situ seismological observations in hard-coal mines in the Ostrava-Karviná Coal Basin (OKCB) (Czech Republic) and in open-pit brown-coal and shale mines in Northwest and Central Bohemia, respectively. Trial measurements were aimed at investigating the peak particle velocity (PPV), which usually enables some crit...

All recent available data sets containing traveltimes of Pg and Sg phases for the Moravo-Silesian region were collected. These data come from several experiments designed mostly in 2D (in-line) configurations. Simultaneous processing of all data is possible only considering the true 3D measurement geometry. The goal of this work is to establish the...

In mid-January 2007 and at the turn of February and March 2008, two extremely strong windstorms, i.e. Kyrill and Emma, hit most of the central European countries. These windstorm hurricane-force winds caused serious damage to structures, to a large number of properties, cars, trees and, moreover, some fatalities were documented, as well. During the...

The paper presents selected results of seismological observations in Silesia and northern Moravia between 01/2004 - 08/2008, which are based on interpretation of three-component digital recordings at solitary seismic stations operated by the Institute of Geonics of the ASCR Ostrava (IGN) distributed in the region under investigation. Five seismic s...

The paper is intended as an analysis of microseismic vibrations before and during the windstorm named "Kyrill", which occurred in mid-January 2007. Microseisms were observed at the Ostrava-Krásné Pole (OKC) seismic station, where broadband seismographs were installed. Two maxima in the graph of displacement amplitudes, around 2 m, were documented d...

Seismic waves generated by earthquakes, quarry blasts, ocean waves and various technological sources cause vibrations that spread through underlying strata into the broad vicinity of these sources. The aim of our experiments was to identify and characterize possible sources of seismic noise generated primarily by technical sources in the Ostrava-Ka...

A grant project for the period 2003-2005, supported by the Grant Agency of the Czech Republic, was set up to determine properties of seismic waves and the structure of the uppermost part of the Earth's crust in the territory of northern Moravia and Silesia. Quarry blasts and mining induced seismic events served as seismic sources. Permanent, tempor...

The induced seismic activity of Ostrava-Karviná coalfield (hereafter only OKR) resulted mainly from mining activities within its eastern part. This part of the coalfield became a center of general interest of long-term seismic observations and less attention was paid to seismic activity of other outer parts of the coalfield. One of such areas is th...

In the time span from January 1995 to December 1999 the Czech National Seismological Network (CNSN), consisting of ten permanent digital broadband stations, several local networks and two data centers, detected and recorded 9530 regional natural seismic events, 27 greater than magnitude 2. Most of these events were located by the Czech Seismologica...

We present comprehensive information on the Frenštát seismic network operated in 1992-2002 by the Institute of Geonics AS CR in Ostrava. The proposed regional diagnostic polygon in the Ostrava-Karviná Coal Basin consisting of 15 observation points was later divided into two parts. The first part (10 stations) surrounded the mining area of the Karvi...

Indukované seismické jevy v důlních polích dolů Staříč a Paskov, Česká republika Jednou z oblastí, kde byl prokázán výskyt indukovaných seismických jevů v průběhu posledního desetiletí, je jihozápadní část ostravsko-karvinského revíru, kde se nalézají doly Staříč a Paskov. Od r. 1990 byly některé indukované seismické jevy detekovány 10-ti staničním...