Structure, seismicity, and thermal regime of the Queen Charlotte Transform Margin
Bibliographic record
Abstract
This study examines structural, seismicity, thermal, and current deformation constraints on the tectonic regime of the Queen Charlotte Margin located off the northwest coast of Canada. The margin is primarily a transcurrent boundary between the oceanic Pacific Plate and the continental North America Plate, but plate motion models indicate ∼20° of current oblique convergence that initiated ∼5 Myr. The estimated 120 km of convergence has been variously explained as accommodated by underthrusting or by crustal shortening. The near‐vertical Queen Charlotte transcurrent fault and lack of Wadati‐Benioff earthquakes argue against underthrusting. However, structural models for the margin, from receiver function and refraction studies, show little evidence of crustal thickening. The pattern of landward decreasing heat flow, gravity anomalies, an accretionary prism landward of the trench or trough, down‐bowing ocean crust and sediments horizons, and a variety of other geophysical evidence support underthrusting. Receiver function analysis on teleseismic data indicates a 10 km thick low‐velocity layer at 35 km depth, dipping 20° to the east, which is interpreted as underthrusting oceanic crust. The heat flow across the fault zone rapidly decreases landward, in agreement with predictions from a finite element thermal model of underthrusting.
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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.001 | 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".