Automatic Detection and Location of Microseismic Events from Sparse Network and Its Application to Post-mining Monitoring

Namjesnik, Dalija; Kinscher, Jannes; Gunzburger, Yann; Poiata, Natalia; Dominique, Pascal; Bernard, P.; Contrucci, Isabelle

doi:10.1007/s00024-021-02773-4

Cited by 5 publications

(7 citation statements)

References 45 publications

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“…The microseismicity seems to follow the orientation of known or supposed tectonic faults in the area. This agrees with the identified clusters obtained by automatic location by Namjesnik et al (2021).…”

Section: First Period (Mid-2010 To Mid-2016)supporting

confidence: 92%

Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France)

2022

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We studied the correlation between seismicity and the water table level in an abandoned coal mine (Bouches-du-Rhône, France), closed in 2003, where groundwater has been pumped out since 2010 to prevent underground flooding. Microseismicity was first felt by the population in 2010 and a strongly felt seismic swarm occurred in November 2012. The origin of the seismicity was therefore questioned, in relation to both the potential instability of old, shallow galleries that might generate damage at the surface and a local seismic hazard assessment. A temporary dense seismic network in the area allowed us to analyse the spatial distribution of the seismicity in detail. Most of the seismicity was clearly located under the mine workings, highlighting that an existing fault system crossing the mining operation was being hydraulically activated, in accordance with the known tectonic extension regime. Our analysis clearly shows a spatiotemporal relationship between seismic migration and the level of the mine aquifer between 2013 and 2017. Thus, seismicity will persist with oscillations of the mining aquifer, depending on the pumping capacities and effective rainfall. Continuous hydraulic and seismic monitoring is necessary to better understand these phenomena and assess the associated risks.

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Section: First Period (Mid-2010 To Mid-2016)supporting

confidence: 92%

Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France)

2022

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“…Analysis presented here focused on exploring further previously observed multiplet phenomena, as well as previously observed spatial event clustering (Namjesnik et al 2021). These phenomena provide us with insight into seismic source origin and underlying triggering mechanisms, as well as its connection with variations in the underground water levels.…”

Section: Study Objectivesmentioning

confidence: 84%

“…In this paper, we present the multiplets analysis, which is part of the research of doctoral thesis of Namjesnik (2021). We focus on events of the detailed seismic catalogue for the period 2014-2017 by Namjesnik et al (2021), based on and recorded continuous data on a temporary network, and newly developed methodology for automated detection and location of events for the sparse networks. However, due to relatively shallow source depths and a low number of stations, the depth of events could not be inferred with high precision and question on seismic origin remained open.…”

Section: Study Objectivesmentioning

confidence: 99%

Impact of past mining on public safety: seismicity in area of flooded abandoned coal Gardanne mine, France

Namjesnik

Kinscher

Contrucci

et al. 2022

Int J Coal Sci Technol

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This paper focuses on the impact of past mining on public safety. It emphasizes the need to understand the induced seismic hazard and consequently improve the post-mining management procedures and legislations, as many mining sites are located in proximity to populated areas. Due to many challenges and complexity of the post-mining environments, induced seismic hazard nowadays remains largely unknown. However, the return experience of several post-mining sites in recent decades have shown us that the mine flooding and/or degradation of mining works can lead to the stress perturbations, inducing the seismicity and the reactivation of the surrounding geological faults. Hence, it is important to advance the seismic monitoring and research of seismicity in flooded post-mining districts. As the number of mine closures worldwide is rising, it can be expected that flooding induced reactivation of the surrounding faults becomes a more often observed phenomenon. We present in this paper the experience of the abandoned flooded coal mine of Gardanne in France, which has been experiencing post-mining seismicity problems since its closure in 2010. We show the results of a recent study of seismic multiplets and clustering of seismic events, as well as their spatio-temporal activity compared to meteorological conditions. These results provide us new insights as well as lead to raising new questions on seismic sources and triggering mechanisms.

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“…. , R n−1 , R n ]); Z min and Z max are the same as the items in Equation ( 14); R W is Equation (11); and E R (R) denotes the internal network. The magnitude energy value corresponding to each sensor in the different radius ranges is the range that the station network can accept, in terms of the different energy levels of the source-induced events.…”

Section: Formula Optimizationmentioning

confidence: 99%

“…Microseismic monitoring (MSM) represents an important real-time, online, and remote monitoring method that is widely used in many fields, including underground tunnel construction, deep mining, water conservancy, and hydropower projects [1][2][3][4][5][6][7][8][9]. Particularly in the case of underground mine excavation and mining construction processes, the scientific framework and practical layout of MSM station networks are the basis for data acquisition and the promotion of field data interpretation and application [10][11][12]. Therefore, the development of an optimization method for the station layout of an MSM system for underground works and mine engineering is very worthwhile [13].…”

Section: Introductionmentioning

confidence: 99%

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

Zhou

Zhao

Huang

2022

Sensors

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The layout of microseismic monitoring (MSM) station networks is very important to ensure the effectiveness of source location inversion; however, it is difficult to meet the complexity and mobility requirements of the technology in this new era. This paper proposes a network optimization method based on the geometric parameters of the proposed sensor-point database. First, according to the monitoring requirements and mine-working conditions, the overall proposed point database and model are built. Second, through the developed model, the proposed coverage area, envelope volume, effective coverage radius, and minimum energy level induction value are comprehensively calculated, and the evaluation reference index is constructed. Third, the effective maximum envelope volume is determined by taking the analyzed limit of monitoring induction energy level as the limit. Finally, the optimal design method is identified and applied to provide a sensor station layout network with the maximum energy efficiency. The method, defined as the S-V-E-R-V model, is verified by a comparison with the existing layout scheme and numerical simulation. The results show that the optimization method has strong practicability and efficiency, compared with the mine’s layout following the current method. Simulation experiments show that the optimization effect of this method meets the mine’s engineering requirements for the variability, intelligence, and high efficiency of the microseismic monitoring station network layout, and satisfies the needs of event identification and location dependent on the station network.

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Automatic Detection and Location of Microseismic Events from Sparse Network and Its Application to Post-mining Monitoring

Cited by 5 publications

References 45 publications

Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France)

Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France)

Impact of past mining on public safety: seismicity in area of flooded abandoned coal Gardanne mine, France

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

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