Review of Geophysical Evidence on Crust and Upper-Mantle Structure On the Eastern Seaboard Of Canada
Bibliographic record
Abstract
Geophysical experiments on the eastern seaboard of Canada show that the structure of the crust is complicated and that there seems to be a close relation between the surface geology and the deeper crustal structure. The crust is approximately 15 km thick beneath the continental slope off Sable Island and 30–35 km thick beneath the continental shelf off Nova Scotia. The thickness increases to 40–45 km beneath the Carboniferous basin of the Gulf of St. Lawrence, and associated with the increase in thickness is an intermediate layer within the crust in which compressional wave velocities of approximately 7 km/sec are found. Compressional wave velocities in the upper part of the mantle beneath ocean basin, continental shelf, and the western margin of the Appalachian system are close to 8 km/sec, but beneath the Gulf of St. Lawrence and beneath northeastern Newfoundland they appear to be in the neighborhood of 8.4–8.7 km/sec. Interpretation of gravity observations has been controlled by the seismic results. One interpretation of the data, suggesting that the density of the mantle below depths of 45 km beneath the continent is higher than that beneath the ocean basin, is in agreement with the high compressional wave velocities found beneath thicker parts of the crust.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.000 |
| Bibliometrics | 0.010 | 0.020 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".