Moment tensor and stress inversion based on hydraulic-fracturing induced events
Bibliographic record
Abstract
A shallow borehole array was employed to record microseismic waveforms during multi-stage hydraulic fracturing operations near Fox Creek, Alberta. A total of 530 events with magnitude larger than MW 0.2 were used to calculate moment tensors, based on the 3C amplitudes and polarities of the direct P-wave. By classifying the best double-couple solutions of the retrieved moment tensors, three groups of distinct focal mechanisms were identified, of which two have predominantly double-couple source mechanisms. The moment tensors of group three exhibit significant non-double-couple components, which needs further interpretation. Based on the resulting source mechanisms, orientations of three principal stresses were estimated. Observed linear alignments within the spatial distribution of microseismic events aided in identifying the fault plane. Presentation Date: Thursday, October 18, 2018 Start Time: 8:30:00 AM Location: 210C (Anaheim Convention Center) Presentation Type: Oral
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".