S receiver function imaging of lithospheric structure beneath Southwestern Canada
Bibliographic record
Abstract
The craton edge beneath southwestern Canada has been characterized as a 'lithospheric step' involving the transition from warm Cordillera to an ancient, mechanically strong North American craton, also known as 'Laurentia'. By using converted shear waves that are sensitive to seismic velocity and density variations, we provide a new image of this transition and reveal the existence of multiple westward-dipping interfaces west of the Rocky Mountain Trench (RMT), the presumed surface suture zone between these two geologically distinct landmasses. These interfaces correlate well, both in location and in strength, with horizontal shear-velocity gradient zones within the craton core. In a span of 400-600 km west of the RMT, the presence of two distinctive horizontal structural gradients (at ~75 km and 180 km) suggests a dual-lithosphere scenario where a Precambrian craton core (Laurentia) now underplates the southeastern Cordilleran lithosphere. The morphology of the craton edge further suggests effects associated with both an uplift of the western craton edge and convective erosion during the past 60 million years.
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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 | 0.000 |
| 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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".