Time-dependent seismic hazard in Bobrek coal mine, Poland, assuming different magnitude distribution estimations

Leptokaropoulos, Konstantinos; Staszek, Monika; Cielesta, Szymon; Urban, Paweł; Olszewska, Dorota; Lizurek, Grzegorz

doi:10.1007/s11600-016-0002-9

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…The episode relates to seismic activity connected with longwall mining of panel 3 in coal seam 503 in the Bobrek mine in the Bytom Syncline (Fig. 1) in the Upper Silesia Coal Basin in Poland (Leptokaropoulos et al 2017). The seismic catalogue consists of 275 events which appeared in the vicinity of panel 3 and the events were recorded since 12th April, 2009 (M L 1.2) to 16th December, 2009 when the strong event (M L 3.7) occurred.…”

Section: Data Used and Methodologymentioning

confidence: 99%

Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors

Mendecki

Wojtecki

Zuberek

2019

Pure Appl. Geophys.

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We would like to test the concept that induced seismicity prior to relatively large mining tremor (M L [ 2.5, E [ 10 6 J) can be inferred from the cumulative Benioff strain release (BSR) as power law time-to-failure before the strong event. This study presents the application of accelerating BSR prior to a large earthquake, widely used in natural seismicity, for analysis of this phenomenon in induced seismicity. The Benioff strain release is quantified as accelerated releases of cumulative (square root sum) of seismic energy in the time series. During the study, five sequences were extracted from the seismic catalogues from two Polish hard coal mines: exhausted Bobrek Mine (data form the IS-EPOS Platform) and from a mine belonging to the Polish Mining Group. Next, a search radius was used to select precursory events and to indicate the type of processes occurring in the coal seam and its vicinity. The fitted power law of cumulative Benioff strain release showed changes of m-parameter. If the value of m was lower than 1.0, the process was regarded as an accelerating-like and if m was higher than 1.0-as a quiescence-like. The investigation of m-parameter vs. the search radius showed the general behaviour of the rock mass in the studied areas and allowed to evaluate the relationship between the critical radius and magnitude of the target event. The obtained scaling relation log(Rc) * 0.35 M L is similar to these reported by other authors who analysed natural seismicity which might suggest that the scaling relation works in a wide range of magnitudes.

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Section: Data Used and Methodologymentioning

confidence: 99%

Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors

Mendecki

Wojtecki

Zuberek

2019

Pure Appl. Geophys.

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“…A variety of parametric and nonparametric approaches have been proposed and routinely applied for describing the magnitude distribution of both tectonic and anthropogenic seismicity (e.g., Kijko and Sellevoll 1989;Utsu 1999;Urban et al 2016;Leptokaropoulos et al 2017). The most commonly used approach assumes that the magnitudes are independent and identically distributed random variables with an infinitely large possible maximum magnitude.…”

Section: Methodsmentioning

confidence: 99%

Temporal response of magnitude distribution to fluid injection rates in The Geysers geothermal field

Leptokaropoulos

Staszek

2018

Acta Geophys.

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The influence of fluid injection rates on the magnitude distribution of the seismicity which occurred in the NW part of The Geysers geothermal site is studied here. A direct comparison between injection rate changes and b value response is attempted after appropriate selection of data subsets. Due to the relatively small sample (1121 events, corresponding to an average rate of ~ 0.45 events/day), we also aggregated seismic activity into two families corresponding to increasing and decreasing injection rates, respectively. The b values were calculated as a function of time lag related to the injection activity. In agreement with previous studies, we found a statistically significant direct relation between b values and injection rate changes, which occurred at a zero or very short time lag (from 0 to ~ 15 days). However, the b value changes are related to the slope (i.e., the second derivative of injection volume), instead of the absolute values of injection rates. The increasing injection rates correspond to b = 1.18 ± 0.06, whereas the decreasing injection rates correspond to b = 1.10 ± 0.05. The corresponding values estimated by the repeated medians technique are b = 1.97 ± 0.20 and b = 1.50 ± 0.13. Both differences are significant at 0.05 level.

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“…Spatial and temporal seismicity rate anomalies are essentially reported as the most frequent intermediate-term precursory phenomenon in timescales varying from a few days to several years (Leptokaropoulos et al 2017). Recent studies focused on two approaches: parametric and non-parametric.…”

Section: Seismic Hazardmentioning

confidence: 99%

The influence of distant coal seam edges on seismic hazard during longwall mining

2020

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Underground coal seam mining has been carried out in the Upper Silesian Coal Basin, Poland, for many years and with a simultaneous increase in exploitation depth. Frequently, coal seams are not fully extracted due to numerous reasons which lead to their edges and remnants remaining in the rock mass. Even in the case of the full extraction of a coal seam, mining usually ends at the border of a protecting pillar to protect underground or surface objects, sometimes at the border of the mining area, or some distance from the old goaf or high throw fault. Extraction of subsequent coal seams in an analogous range results in a cluster of coal seam edges remaining. In the vicinity of the mentioned remainders, the disrupted stress distribution is expected. The infraction of the aforementioned equilibrium repeatedly results in the occurrence of strong mining tremors. The observations from the studied coal seam no. 408’s longwall panel indicated that mining works are able to disturb the present stress-strain equilibrium in the area of the edges of other coal seams, even if they are located at a greater vertical distance away. The seismological parameters and distributions have been applied for this purpose.

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Time-dependent seismic hazard in Bobrek coal mine, Poland, assuming different magnitude distribution estimations

Cited by 13 publications

References 31 publications

Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors

Case Studies of Seismic Energy Release Ahead of Underground Coal Mining Before Strong Tremors

Temporal response of magnitude distribution to fluid injection rates in The Geysers geothermal field

The influence of distant coal seam edges on seismic hazard during longwall mining

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