Reliability of Seismic Moment Tensor Inversions for Induced Microseismicity at Kidd Mine, Ontario

Trifu, C-I; Shumila, V.

doi:10.1007/978-3-0348-8179-1_7

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…This can be achieved by an experiment with at least two monitoring boreholes and by processing both P‐ and S‐waves. Optimally, the inversion for the complete moment tensor should be supplemented by estimates of their reliability and by error analysis (Šílený 1998; Trifu, Angus and Shumila 2000; Trifu and Shumila 2002; Šílený 2004).…”

Section: Discussionmentioning

confidence: 99%

“…They are analysed by detection algorithms, and the events are traced to image fracturing as a function of time. Seismic waveforms are used to determine the source–time functions and moment tensors, which provide information about the size and orientation of fractures (Rutledge, Phillips and Schuessler 1998; Nolen‐Hoeksema and Ruff 2001; Trifu and Shumila 2002; Rutledge and Phillips 2003). The moment tensors also indicate whether the fracture is opening or closing, which is the key to monitoring the connectivity of the fracture (Ross, Foulger and Julian 1999; Maxwell and Urbancic 2001; Foulger et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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On the retrieval of moment tensors from borehole data

Vavryčuk¹

2007

Geophysical Prospecting

144

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A B S T R A C TThe complete moment tensors of seismic sources in homogeneous or vertically inhomogeneous isotropic structures cannot be retrieved using receivers deployed in one vertical borehole. The complete moment tensors can be retrieved from amplitudes of P-waves, provided that receivers are deployed in at least three boreholes. Using amplitudes of P-and S-waves, two boreholes are, in principle, sufficient. Similar rules also apply to transversely isotropic media with a vertical axis of symmetry.In the case of limited observations, the inversion can be stabilized by imposing the zero-trace constraint on the moment tensors. However, this constraint is valid only if applied to observations of shear faulting on planar faults in isotropic media, which produces double-couple mechanisms. For shear faulting on non-planar faults, for tensile faulting, and for shear faulting in anisotropic media, the zero-trace constraint is no longer valid and can distort the retrieved moment tensor and bias the fault-plane solution.Numerical modelling simulating the inversion of the double-couple mechanism from real data reveals that the errors in the double-couple and non-double-couple percentages of the moment tensors rapidly decrease with increase in the number of boreholes used. For noisy P-and S-wave amplitudes with noise of 15% of the top amplitude at each channel and for a velocity model biased by 10%, the errors in the double-couple percentage attain 25, 13 and 6% when inverting for the double-couple mechanism from one, two and three boreholes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the retrieval of moment tensors from borehole data

Vavryčuk¹

2007

Geophysical Prospecting

144

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“…The salt deposits has been exploited since Roman Times [67], as the local lithology is represented by diapir folds, with the salt massif reaching the surface through the Ocnele Mari-Ocnița anticline [66]. The salt deposit is about 8 km long, with thicknesses up to 400 m [68]. As initially salt was exploited only for food, at the beginning of 19 th century, the curative qualities of salt waters stated to be used through spa resorts [66].…”

Section: Description Of the Test Sitementioning

confidence: 99%

“…As in the examples above, Ocnele Mari is an urban mining area affected by effects of the salt exploitation works. Teica Mare old mine was closed in the 1990s, after a major collapse in Field II, close to a densely populated area [68]. Its exploitation was followed by crashes in 2001 and 2005 with devastating impacts on human settlements and pollution on Sarat River [93].…”

Section: Case Study On Ocnele Marimentioning

confidence: 99%

Review on the Use of Satellite-Based Radar Interferometry for Monitoring Mining Subsidence in Urban Areas and Demographic Indicators Assessment

Radutu

Vlad-Sandru

2023

Mining Revue

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Mining activities represent one of the main causes leading to subsidence in the natural and urban environment. Sustainable urban planning and detection of potential hazards in mining areas involve the use of adequate instruments such as the continuous monitoring of land subsidence. The complexity of urban environment demands the utilization of new methods for monitoring and quantifying the effects of the mining processes. In the last decades, considering the technological developments from the remote sensing domain, the Synthetic Aperture Radar Interferometry (InSAR) techniques offer the opportunity for early detection and continuous monitoring of subsidence in mining areas, including urban centers. Considering various parameters of mining subsidence monitoring, a review of several tens of studies realized in different mining sites, based on InSAR techniques, is presented. As mining subsidence in urban areas has a direct impact on the quality of life, the review is completed with demographic indicators assessment, followed by a study case on the dynamics of the population in an urban mining area from Romania, Ocnele Mari.

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“…Dreger & Helmberger 1993; Pasyanos et al 1996; Dreger 2003; Bernardi et al 2004; Clinton et al 2006; Scognamiglio et al 2009). Furthermore, quick estimations of the source parameters are important for hazard mitigation in mining operations (Trifu & Shumila 2002; Gibowicz 2009), for the evaluation of potential adjustments during/after hydraulic injections in the oil industry (Maxwell et al 2002; LeCampion et al 2004), as well as for monitoring volcanic activities (McNutt 1996; Foulger et al 2004) and fluid injections in geothermal areas (Julian et al 2010). Most inversion algorithms employed in the aforementioned applications do not provide simultaneous estimations of all three source parameters.…”

Section: Introductionmentioning

confidence: 99%

A compressive sensing framework for seismic source parameter estimation

Rodriguez

Sacchi

2012

Geophysical Journal International

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SUMMARY Simultaneous estimation of origin time, location and moment tensor of seismic events is critical for automatic, continuous, real‐time monitoring systems. Recent studies have shown that such systems can be implemented via waveform fitting methods based on pre‐computed catalogues of Green’s functions. However, limitations exist in the number and length of the recorded traces, and the size of the monitored volume that these methods can handle without compromising real‐time response. This study presents numerical tests using a novel waveform fitting method based on compressive sensing, a field of applied mathematics that provides conditions for sampling and recovery of signals that admit a sparse representation under a known base or dictionary. Compressive sensing techniques enable us to determine source parameters in a compressed space, where the dimensions of the variables involved in the inversion are significantly reduced. Results using a hypothetical monitoring network with a dense number of recording stations show that a compressed catalogue of Green’s functions with 0.004 per cent of its original size recovers the exact source parameters in more than 50 per cent of the tests. The gains in processing time in this case drop from an estimated 90 days to browse a solution in the uncompressed catalogue to 41.57 s to obtain an estimation using the compressed catalogue. For simultaneous events, the compressive sensing approach does not appear to influence the estimation results beyond the limitations presented by the uncompressed case. The main concern in the use of compressive sensing is detectability issues observed when the amount of compression is beyond a minimum value that is identifiable through numerical experiments. Tests using real data from the 2002 June 18 Caborn Indiana earthquake show that the presence of noise and inaccurate Green’s functions require a smaller amount of compression to reproduce the solution obtained with the uncompressed catalogue. In this case, numerical simulation enables the assessment of the amount of compression that provides a reasonable rate of detectability. Overall, the numerical experiments demonstrate the effectiveness of our compressed domain inversion method in the real‐time monitoring of seismic sources with dense networks of receivers. As an added benefit of the compression process, the size of the monitored volume can also be increased under specific restrictions while maintaining the real‐time response.

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Reliability of Seismic Moment Tensor Inversions for Induced Microseismicity at Kidd Mine, Ontario

Cited by 8 publications

References 10 publications

On the retrieval of moment tensors from borehole data

On the retrieval of moment tensors from borehole data

Review on the Use of Satellite-Based Radar Interferometry for Monitoring Mining Subsidence in Urban Areas and Demographic Indicators Assessment

A compressive sensing framework for seismic source parameter estimation

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