Relocation of the 1982 Miramichi, New Brunswick, Canada, aftershock sequence
Bibliographic record
Abstract
On 9 January 1982, in the Miramichi region of New Brunswick, Canada, an earthquake with body-wave magnitude (mb) 5.7 occurred. Itwas followed by extensive aftershocks and felt throughout eastern Canada and northeastern USA. Digital seismic stations were not yet commonby 1982. Fortunately, three stations (KLN, EBN and GGN) produced excellent waveform records for the larger aftershocksallowingthese aftershocks to be relocated. For each aftershock,its focal depth was first determinedusing thedepth phase sPg; then, with depth fixed, the epicenter was determinedusing a set of arrival times recorded for the Pg-, Sg-, and Pn-phases at the three stations.Sixty-eight aftershocks were relocated; mostof them occurred in a 5×5 km areaand with depthsof2 to 6 km. The epicentres formed two linear trends in theNE-SW direction. The trends were close to the northeast strike of the focal mechanism of the mainshock and consistent with the topographic trend near the source region. A gap betweenthe trends separated the epicenters into two groups. One group representstherupture area caused by themainshock, and the other groupmight represent the rupture area caused by the mb 5.4principal aftershock.
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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 | 0.002 | 0.003 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".