Richard Lynch

Richard Lynch
Sisprobe

PhD

About

21
Publications
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294
Citations
Introduction
Skills and Expertise

Publications

Publications (21)
Article
As mineral exploration seeks deeper targets and targets under cover, the need for low cost and low impact subsurface imaging is increasingly important. A recent addition to the toolbox of geophysical methods is ambient noise surface wave tomography (ANSWT) which produces an S-wave velocity image of the subsurface using naturally occurring seismic s...
Article
Rock mass characteristics such as applied stress, pore pressure and fracture density are coupled to seismic wave propagation velocity. Measuring small relative changes of seismic wave velocities in operational mines, therefore has potential for tracking changes in these important rock mass properties. To this end we conducted an experiment with the...
Article
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Tailings dams are massive structures that are designed to contain the waste slurry remaining after processing ore at open pit and underground mines. These structures fail far more regularly than normal water storage dams and in recent years catastrophic tailings dam failures have occurred, causing significant damage to the environment and even loss...
Article
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The in situ mechanical response of a rock mass to a sudden dynamic and static stress change is still poorly known. To tackle this question, we conducted an experiment in an underground mine to examine (1) the influence of dynamic and static stress perturbations on seismic velocities, (2) elastic static stress changes, and (3) induced earthquake act...
Article
Full-text available
The reconstruction of seismic Green's functions from correlations of ambient seismic noise has recently developed as a promising approach for exploring the earth's interiors without the requirement of costly active seismic sources. This approach is widely used for imaging the crust at a kilometer scale. However, few studies report noise-based Green...
Article
Careful monitoring of the position of the cave front is essential for well-managed block cave mining. Seismic monitoring systems yield 3-D information about the location of fracturing ahead of the cave. However, because the aseismic gap between cave surface and seismogenic zone is of unknown extent, the cluster of raicroseismicity can only yield an...
Article
Full-text available
ISS International, ЮАР Введение В последние годы новым направлением в комплексе исследований, способствующих повышению безопасности и экономической эффективности открытых горных работ, ста-новится микросейсмический мониторинг. Данная разновидность мониторинга основана на представительной регистрации сейсмических колебаний от небольших актов хрупког...
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Full-text available
Manifestations of pronounced shell effects are found when combining nonaxial octupole deformations with a three-dimensional harmonic oscillator model. The contributions of the main classical periodic orbits of this intrinsically chaotic three degrees of freedom system are obtained from a frequency analysis. An adiabatic approximation based on the r...
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Manifestations of pronounced shell effects are discovered when non-axial octupole deformations are added to a harmonic oscillator model. The degeneracies of the quantum spectra are in good agreement with the corresponding main periodic orbits and winding number ratios which are found by classical analysis.
Article
Full-text available
Routine seismic monitoring in mines enables the quantification of exposure to seismicity and provides a logistical tool to guide the effort into the prevention and control of, and alerts to, potential rock mass instabilities that could result in rock bursts. One can define the fol-lowing five specific objectives of monitoring the seismic response o...

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