Bibliographic record
Abstract
In the seismically active region of Charlevoix, Quebec, seismic travel time experiments have been undertaken from 2 shot points that were recorded at up to 13 stations. Over a period of 1870 days, 12 shots were set off on the northshore and 8 shots on the southshore of the St. Lawrence River. Epicentral distances vary from 12 to 68 km. Significant long term changes in travel time residuals of up to 46 ± 11 ms have been observed. The maximum difference from one shot point to two of the stations is 76 ± 16 ms. A maximum in residual was observed SW of the center of the Charlevoix impact structure in 1976, this maximum spread towards the NE in 1978 and the SW in 1978 and 1979. The relative average shot residuals from the north shore increased from 1974 to 1977 then decreased in 1978 and remained steady through 1979. For the south shore a maximum was observed in 1976 after which it gradually decreased. Two small earthquakes on 31 October 1976 and 5 July 1979, are not likely to have resulted in short term velocity changes, but a magnitude 5.1 event certainly did not. The hypothesis that the vertical component of the earth tide produced changes in travel-time was tested experimentally and rejected. It is concluded that the observed negative changes in velocity, can be explained in terms of the dilatancy-diffusion model. Positive changes in velocity may be due to the closing of cracks.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".