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.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 teacher head, 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".