Investigation of fracture zone properties using reflected seismic waves from passive microseismicity
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Bibliographic record
Abstract
A new method has been developed for imaging seismic reflectors using seismogram data recorded by a few standard triaxial geophones. A directional migration approach reduces imaging artefacts due to the low aperture of the sensor array. This is possible by measuring the polarisation in the seismogram coda and considering all four reflected body-waves: PP', PS', SP' and SS'. This technique has been applied to seismograms recorded by deep borehole sensors at Williams mine, Canada, in order to invert for fracture zone properties surrounding the open pit. A fracture zone thickness of 20 m, with average rock quality designation (RQD) of 75%, best matches the seismic data, and is closely correlated to the mine's borehole core observations. This finding has useful implications for efforts to remove tunnel reflections from seismograms recorded by standard (short borehole) geophones underground. As such, it is a necessary first step before standard microseismic monitoring arrays can be used to image the rock mass beneath and ahead of a working underground mine using reflection seismology.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it