Locations of the 1982 Miramichi (Canada) Aftershocks : Implication of Two Rupture Regions Activated
Bibliographic record
Abstract
On 9 January 1982, in the Miramichi region of New Brunswick, Canada, an earthquake with mb 5.7 occurred. It was followed by extensive aftershocks and felt throughout eastern Canada and north-eastern USA. Since this earthquake occurred in an uninhabited region, the damage was minor. Due to an mb 5.7 event is rare in north-eastern America, investigating it and its aftershocks is important for understanding intraplate seismicity. Digital seismic stations were not yet common by 1982. Fortunately, four seismic phases at three stations could be used to locate larger aftershocks. A simplified master-event location method combined with regional depth-phase modeling was used to locate aftershocks. For each aftershock its focal depth was first determined using a depth phase; then, with the depth fixed, the epicenter was determined using the four arrival time readings measured at the same three stations. The located aftershocks were divided into three groups. In each group the earthquake numbers are similar, but the majority of the energy was released in one group. The epicenters formed two trends in the NE–SW direction, implying that the Miramichi earthquake sequence activated two rupture regions.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".