Two Moderate Earthquakes near Montreal: 10 October and 6 November 2012
Bibliographic record
Abstract
On 10 October 2012 a moderate, Nuttli magnitude ( M N) 4.5, earthquake occurred in the Montreal region. Although it did not cause any damage, it was felt throughout the region and at distances to a few hundred kilometers. The earthquake was very well recorded by seismographs at regional distances, allowing its source parameters (such as focal mechanism and depth) to be determined. Both the regional moment tensor inversion and first‐motion methods indicate predominantly thrust faulting on a northwest‐striking plane, which is typical of the west Quebec seismic zone. A depth of 13–15 km was indicated by the regional moment tensor inversion and by the regional depth phase method. The moment magnitude of 3.7 is slightly smaller than would be expected based on the average M N− M w relation but is well within the range of observed values for previous earthquakes. More than 10,000 felt reports were received via an Internet “Did You Feel It?” page. A few weeks later, on 6 November 2012, another moderate ( M N 4.2, M w 3.9) earthquake occurred in the west Quebec seismic zone but in a different location, near the Quebec–Ontario border. This event also had a northwest predominantly thrust mechanism. Depths obtained by regional moment tensor and depth phase methods were both in the 6–8 km range. Over 2500 online felt reports were received. The earthquakes provided a successful test of recent changes made to handle high volumes of Internet traffic that typically occur after a significant earthquake felt in a large, urban area.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".