Episode: BOBREK

Barański, Adam; Mutke, Grzegorz

doi:10.25171/instgeoph_pas_isepos-2017-003

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Data on the location of events and the progress of mining work in the Bobrek mine used in the article were published on the IS-EPOS platform [33]. A total of 2995 events were recorded and located in the period between April 2009 and July 2010.…”

Section: Datamentioning

confidence: 99%

Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland

2020

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In rock mass disturbed by mining activity, distortions in the stress balance may lead to seismic energy being emitted in reactivated seismogenic structures. One way of increasing the imaging resolution of these seismically active structures is through relocation, which itself can be achieved using the cloud collapsing method. This method partially eliminates perturbations in the location of seismic energy sources concerning the actual positions of these sources. It enables events to be grouped into spatially ordered structures that may correspond to actual tectonic structures, such as fractures, fissures, or faults. We present the results of applying the collapsing method in mining seismology using a cloud of located events recorded during mining activity at one of the coalfaces in the Bobrek hard coal mine. The relocation procedure was applied to all the foci of events recorded during mining activity on face 3/503 between April 2009 and July 2010. In the relocated point cloud, two types of the linear structure responsible for generating events are automatically distinguished using the HDBSCAN algorithm: structures directly related to mining activity and structures associated with local tectonics. The location of the separated structures of the first type corresponds to the range of coalface 3/503 and the shafts delimiting earlier mined seams 507 and 509 located below. The isolated structures of the second type, with almost vertical orientation, are associated with existing zones of discontinuity that become seismically active as a result of mining activity. The identified structures lie near the biggest events recorded, which is evidence that these structures may correspond to real discontinuity zones.

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Section: Datamentioning

confidence: 99%

Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland

2020

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“…integral to the judicial process". 73 Finally in SCVG & KLD, the full court expressed concern about the way in which "reference to materials to which the parties were not privy . .…”

Section: Casesmentioning

confidence: 99%

The Role of Social Science in Australian Family Law: Collaborator, Usurper or Infiltrator?

Rathus¹

2014

Family Court Review

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This article explores the somewhat ambiguous relationship between family law decision making and social science research in contemporary Australian family law. It follows the history of social scientists and social science research in the current family law system since its commencement in 1976 and sets this against the changing socio‐legal climate of the four decades covered. It demonstrates that, while social science research has been of critical importance to the progress of family law, its use by judicial decision makers raises questions about the contested, shifting, and selective nature of the content and the absence of any legal basis by which these extrinsic materials could be received. Extensive referencing of social science research by some judicial officers in recent years has triggered appellate authority disapproving its use. It is argued that there is growing uncertainty in the relationship between the disciplines of social science and law in the family law system and that steps should be taken to begin resolving this. Keypoints Role of social science in family law Analysis of Australian family law cases that use social science research Use of extrinsic materials by judges Fathers' rights' groups Shared parenting debate Use of attachment theory in courts

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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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Episode: BOBREK

Cited by 3 publications

References 9 publications

Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland

Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland

The Role of Social Science in Australian Family Law: Collaborator, Usurper or Infiltrator?

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

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