Tremblements de terre et failles de l'astroblème de Charlevoix (Québec)
Bibliographic record
Abstract
This field guide was first written for the meeting of the Eastern Section of the Seismological Society of America (ES-SSA), held in La Malbaie in 2013. It has been slightly modified, mostly with new figures. The Charlevoix Seismic Zone is the locus of the highest seismic hazard in continental eastern Canada. At the heart of this zone is the ~54 km diameter Charlevoix impact structure. This structure, located less than 125 km east of Quebec City, is one of the most accessible large meteorite impact structures in eastern North America. The Charlevoix impact structure is singled out as it overprints Iapetus rift faults and the Logan's Line marking the edge of the Appalachian Orogen. The Charlevoix impact structure gives the region its singular landscape. The ~5 km wide peripheral ring trough forms a prominent open valley extending from St. Lawrence River (sea level) to a threshold at ~250 m altitude. The highest point in the valley is nearly 850 m below the ~1100 m mean elevation of the external Laurentian plateau. The highest point is also 550 m below the central uplift, 'Mont-des-Éboulements,' which stands 780 m above sea level. The overall morphology of the Charlevoix impact structure matches that of a complex impact crater. Shatter cones, mylolisthenite injections and shock-induced planar deformation microstructures in quartz and feldspar are widespread providing compelling evidence for the extent of shock metamorphism. The age of the impact is poorly constrained. Recently acquired 40Ar/39Ar and U-Pb data from impact melt rock and pseudotachylite give a late-Ordovician age, which appears to be in better agreement with field relationships than the previously reported K-Ar Devonian-age.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.005 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.145 | 0.021 |
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".