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Recording of mining tremors from Poland by the SPF local seismic network in the Czech Republic
342A
HYDROGEOLOGYGROUNDWATER
968040
Meehonizm wstrzaaow gorniczyeh w swietle obserwacji ich skutkow w wyrobiskacb (The mechanism of mining tremors related to damages observed in the stope area) G. Sagan, R. Dubiel, P. Mitrega & W. M. Zuberek, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 33-45.
Six mining tremors (connected with rockbursts) from the Wujek coal mine area, with energies lo’-10’ J, were chosen for investigation. All events caused serious and well documented damage in mining excavations and were felt on the Earth’s surface. The mechanisms of these tremors were determined on the basis of digital recordings from the mining seismological network using the seismic moment tensor inversion method for P-wave first arrivals. The number of analysed events was small but it appears that tremors connected with coal rockbursts have a smaller isotropic to deviatoric ratio of the seismic moment tensor compared to mining tremors without damages observed underground. (from English summary) 968041 Geofmyczna i geomecbaniczna interpretacja tapniecia z dnia 9 Grudnia 1993 r. w KWK ‘Nowy Wirek’i ‘Halemba’ (Geophysical and geomecbanical interpretation of the rockburst of December 9, 1993 at Nowy Wirek and Halemba coal mines) J. Dubinski, W. Konopko & G. Mutke, Publications -
Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 73-85.
On December 9, 1993, a very strong seismic event occurred, with seismic enerav E = 3 x lo9 J. The focus was located in the border area gtween the Nowy Wirek and Halemba coal mines. The event was associated with a rockburst that caused extensive damage in both coal mines and small damage in the nearby Slask mine. Analyses of geological, geomechanical and geophysical data were carried out with the aim of determining the mining origin of the tremor. The results point to the regional character of the event, which was the effect of a multi-plane deformation of strong, monolithic and thick roof rock mass, which appeared in the area of the coal seam. (English summary) 968042
Recording of mining tremors from Poland by the SPF local seismic network in the Czech Republic Z. Kalab & J. Knejzlik, Publications - Institute of Geophy-
sics, Polish Academy of Sciences, series M, M-19(281), 1995,
pp 269-277. A large group of records from the local network Seismic Polygon Frenstat refers to events occurring in Poland. The number of these events is 30 to 90 monthly. They are mainly composed of seismic events occurring both in the whole Polish part of the Upper Silesian Coal Basin and in the Lubin Copper Basin. The examples of wave patterns of some seismic events are presented. The interpretation of a rockburst that occurred at Halemba coal mine on December 9, 1993 is also given. (from Authors)
968044
Space-time variations of the frequency-energy relation for mining-induced seismicity in the Ostrava-Karvina mining district K. Holub, Pure & Applied Geophysics, 146(2), 1996, pp 265 280. The values of parameters of the relation log N = (I - b log E characterize in general the level of seismicity of individual regions. A detailed analysis of b values of the frequencyenergy distributions was carried out with the aid of a database of seismic events recorded by the seismological networks in the Ostrava-Kanrina Coal Mine District (Czech Republic), using the least squares regression and maximum likelihood method, as well. Special attention has been paid to induced seismic events statistics for the vicinity of one of the coalfaces in the Lazy Mine. It could be generally stated that lower b values correspond to a higher level of induced seismic activity, while the higher ones correspond to a low and a moderate seismic activity. (from Author) 968045
Correlation analysis of microeartbquakes in western Bohemia, Czech Republic T. Jira, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 289-295. Correlation analysis was used to study the similarity of local earthquake seismograms. The cross-correlation function was applied to 56 events. All records used in the study come from station SNE belonging to the local seismic network in western Bohemia. (Author)
HYDROGEOLOGY General 968046
Systemes d’aquiferes profonds dans Ie bassin molassique du sud-ouest de Palfemagne. Analyse hydrogeologique approfondie servant de base a un futur management quantitatif et quafitntif (The deep aqdfer network in the sandstone basin of southwest Germany. Detailed bydrogeological analysis as a basis for future quantitative and qualitative management) R. Watzel & B. Bertleff, Houille Blanche, 51(3), 1996, pp 6166. This sandstone basin is an area where the geothermic exploitation is intensive. Hydraulic, hydroehimic and isotopic studies have shown that two circulation zones have to be differentiated. The possibilities of geothermic exploitations are determined by the ratio of the Pleistocene aquiferous stratum to that of the recently formed one. The possible consequences for the future use of the stratum is outlined. (from English summary)
Groundwater 968047
968043
Seismic monitoring and mazimum event prediction at hmgwall no. 138704 in the Lazy coal mine, Czech Repablic P. Kalenda, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 163-176. The geological, geomechanical and technological conditions of coal excavations, which had an influence on seismic activity in the vicinity of a longwah in the mine, are analysed on the basis of seismoacoustic and seismological monitoring. The future location of anomatous events, expected maximum energy events and the value of accumuhtted energy are estimated from an analysis of current and global seismic activity, The global and local character of the seismicity is described. (Author)
Water resources at risk. Proceedings of a conference, Denver, May 1995 cd W. R. Notchkiss, J. S. Downey, E. D. Gutentag & J. E. Moore, (American Institute of Hydrology, Minneapolis), 1995, unpaginated, index. The proceedings contains 97 selected papers which represent more than half of the scheduled nresentations. Thev are divided into seven sections. There w&r an educational f6rum for teachers and a poster session and the papers from these are included. The five other sections include the papers from the symposia in the following subject areas: interdisciplinary hydrology; groundwater and aquifer properties; water quality and riparran stud@ water and mining technology; nuclear hydrology (ASlowey)
HYDROGEOLOGYGROUNDWATER
968040
Meehonizm wstrzaaow gorniczyeh w swietle obserwacji ich skutkow w wyrobiskacb (The mechanism of mining tremors related to damages observed in the stope area) G. Sagan, R. Dubiel, P. Mitrega & W. M. Zuberek, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 33-45.
Six mining tremors (connected with rockbursts) from the Wujek coal mine area, with energies lo’-10’ J, were chosen for investigation. All events caused serious and well documented damage in mining excavations and were felt on the Earth’s surface. The mechanisms of these tremors were determined on the basis of digital recordings from the mining seismological network using the seismic moment tensor inversion method for P-wave first arrivals. The number of analysed events was small but it appears that tremors connected with coal rockbursts have a smaller isotropic to deviatoric ratio of the seismic moment tensor compared to mining tremors without damages observed underground. (from English summary) 968041 Geofmyczna i geomecbaniczna interpretacja tapniecia z dnia 9 Grudnia 1993 r. w KWK ‘Nowy Wirek’i ‘Halemba’ (Geophysical and geomecbanical interpretation of the rockburst of December 9, 1993 at Nowy Wirek and Halemba coal mines) J. Dubinski, W. Konopko & G. Mutke, Publications -
Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 73-85.
On December 9, 1993, a very strong seismic event occurred, with seismic enerav E = 3 x lo9 J. The focus was located in the border area gtween the Nowy Wirek and Halemba coal mines. The event was associated with a rockburst that caused extensive damage in both coal mines and small damage in the nearby Slask mine. Analyses of geological, geomechanical and geophysical data were carried out with the aim of determining the mining origin of the tremor. The results point to the regional character of the event, which was the effect of a multi-plane deformation of strong, monolithic and thick roof rock mass, which appeared in the area of the coal seam. (English summary) 968042
Recording of mining tremors from Poland by the SPF local seismic network in the Czech Republic Z. Kalab & J. Knejzlik, Publications - Institute of Geophy-
sics, Polish Academy of Sciences, series M, M-19(281), 1995,
pp 269-277. A large group of records from the local network Seismic Polygon Frenstat refers to events occurring in Poland. The number of these events is 30 to 90 monthly. They are mainly composed of seismic events occurring both in the whole Polish part of the Upper Silesian Coal Basin and in the Lubin Copper Basin. The examples of wave patterns of some seismic events are presented. The interpretation of a rockburst that occurred at Halemba coal mine on December 9, 1993 is also given. (from Authors)
968044
Space-time variations of the frequency-energy relation for mining-induced seismicity in the Ostrava-Karvina mining district K. Holub, Pure & Applied Geophysics, 146(2), 1996, pp 265 280. The values of parameters of the relation log N = (I - b log E characterize in general the level of seismicity of individual regions. A detailed analysis of b values of the frequencyenergy distributions was carried out with the aid of a database of seismic events recorded by the seismological networks in the Ostrava-Kanrina Coal Mine District (Czech Republic), using the least squares regression and maximum likelihood method, as well. Special attention has been paid to induced seismic events statistics for the vicinity of one of the coalfaces in the Lazy Mine. It could be generally stated that lower b values correspond to a higher level of induced seismic activity, while the higher ones correspond to a low and a moderate seismic activity. (from Author) 968045
Correlation analysis of microeartbquakes in western Bohemia, Czech Republic T. Jira, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 289-295. Correlation analysis was used to study the similarity of local earthquake seismograms. The cross-correlation function was applied to 56 events. All records used in the study come from station SNE belonging to the local seismic network in western Bohemia. (Author)
HYDROGEOLOGY General 968046
Systemes d’aquiferes profonds dans Ie bassin molassique du sud-ouest de Palfemagne. Analyse hydrogeologique approfondie servant de base a un futur management quantitatif et quafitntif (The deep aqdfer network in the sandstone basin of southwest Germany. Detailed bydrogeological analysis as a basis for future quantitative and qualitative management) R. Watzel & B. Bertleff, Houille Blanche, 51(3), 1996, pp 6166. This sandstone basin is an area where the geothermic exploitation is intensive. Hydraulic, hydroehimic and isotopic studies have shown that two circulation zones have to be differentiated. The possibilities of geothermic exploitations are determined by the ratio of the Pleistocene aquiferous stratum to that of the recently formed one. The possible consequences for the future use of the stratum is outlined. (from English summary)
Groundwater 968047
968043
Seismic monitoring and mazimum event prediction at hmgwall no. 138704 in the Lazy coal mine, Czech Repablic P. Kalenda, Publications - Institute of Geophysics, Polish Academy of Sciences, series M, M-19(281), 1995, pp 163-176. The geological, geomechanical and technological conditions of coal excavations, which had an influence on seismic activity in the vicinity of a longwah in the mine, are analysed on the basis of seismoacoustic and seismological monitoring. The future location of anomatous events, expected maximum energy events and the value of accumuhtted energy are estimated from an analysis of current and global seismic activity, The global and local character of the seismicity is described. (Author)
Water resources at risk. Proceedings of a conference, Denver, May 1995 cd W. R. Notchkiss, J. S. Downey, E. D. Gutentag & J. E. Moore, (American Institute of Hydrology, Minneapolis), 1995, unpaginated, index. The proceedings contains 97 selected papers which represent more than half of the scheduled nresentations. Thev are divided into seven sections. There w&r an educational f6rum for teachers and a poster session and the papers from these are included. The five other sections include the papers from the symposia in the following subject areas: interdisciplinary hydrology; groundwater and aquifer properties; water quality and riparran stud@ water and mining technology; nuclear hydrology (ASlowey)