Moho Structure Across the Backarc‐Craton Transition in the Northern U.S. Cordillera
Bibliographic record
Abstract
Abstract In southern Canada and the northern United States, the present‐day western edge of the North American craton (Laurentia) is marked by a profound change in lithospheric thickness, from 100 km within a hot backarc setting beneath the Cordillera to 200 km beneath the craton. A nearly uniformly flat Moho in the backarc region of southern Canada has been interpreted as a young feature that was produced by lower crustal channel flow. The tectonic environment of the southern Canadian Cordillera extends southward to the Lewis and Clark shear zone in the northern United States, where previously deployed EarthScope Transportable Array stations provide coverage on a 70 km grid. Here, data from Transportable Array stations are used to investigate teleseismic P to S receiver functions of crustal structure across the craton‐backarc transition, coupled with lithospheric structure derived from a recent global tomographic model. These images suggest that, north of the Lewis and Clark shear zone, the shallower Moho beneath the Cordillera has encroached on the craton, creating a narrow complex transition zone. To the south, a step‐like change in crustal thickness is observed, and the complex Moho transition zone is absent. Taken together with other geological and geophysical data, these observations suggest that a young Moho has progressed eastward accompanied by thermal and/or mechanical modification of the Laurentian lithosphere.
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 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 | 0.000 | 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".