Geodetic Observations of Tectonic Deformation in Alaska and Western Canada: The EarthScope Revolution
Bibliographic record
Abstract
The number of GPS sites in Alaska and western Canada has exploded over the past 15 years, largely due to the PBO/NOTA stations installed as part of the NSF-funded EarthScope project. This expanded geodetic data set has provided an unprecedented view of deformation along the north Pacific margin. The entire region moves in ways distinct from stable North America. Long-term motion of the upper plate includes northwestward motion in southeast Alaska and the St. Elias region, a clockwise rotation from the southeast Alaska coast into the Northern Cordillera of Canada, a series of counterclockwise rotations south of the Denali Fault, and southerly motion in northern Alaska. Geodetically determined coupling along the subduction interface varies greatly, with correlations between past earthquakes, areas of high and moderate coupling, and lateral coupling boundaries. GPS data from a number of large earthquakes have captured complex slip patterns, evolution of slip during events, and interactions between earthquakes. Postseismic deformation from several large earthquakes, including the 1964 M9.2 Great Alaska and the 2002 M7.9 Denali earthquakes, is ongoing. Transient slow slip events along the subduction interface may accommodate part or most of the slip budget in areas of partial coupling.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.007 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".