Geometry of the subducting Juan de Fuca plate: new constraints from SHIPS98
Bibliographic record
Abstract
We have processed seismic reflection profiles acquired in the Strait of Juan de Fuca, inverted travel times of first arrivals from onshore recordings of the offshore shots to determine the velocity of the upper crust in this region and inverted the travel times of first and secondary arrivals that undershoot the central core of the Olympic Mountains. The seismic reflection profiles show a pattern of crustal reflectivity similar to that recorded beneath Vancouver Island. Inversion of first arrivals, interpreted to be diving waves through the upper and mid-crust indicate a 5 - 7 km-deep linear, northwest-trending basin beneath the southwestern shore of the Strait and uplift of the basement Crescent terrane rocks beneath the northwestern shore. Velocities beneath the central Olympic Peninsula at 15 - 25 km depth show strong lateral variation, with higher velocities underlying the surface exposures of the Crescent terrane and lower velocities at these depths beneath the Olympic core rocks. Inversion of secondary seismic arrivals interpreted to be reflections from the base of the crust of the subducted Juan de Fuca plate indicate that the Moho is at a depth of about 34 km beneath the western Strait of Juan de Fuca and dips about 7o to the east, reaching a depth of about 46 km beneath the eastern boundary of Olympic National Park. Correlating these results with results of previous experiments on Vancouver Island and in southwestern Washington confirm earlier interpretations of an arch in the subducted slab beneath the Olympic peninsula but indicate that the arch is asymmetric and less pronounced than previously thought. We attribute both the northwest-trending folding of the Crescent terrane and the asymmetry in the shape of the subducting slab to resistance to the northward motion of the Paleocene-age Cascadia forearc terrane by the thick lithosphere of the pre-Tertiary terranes of British Columbia.
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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 | 0.000 | 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) | 0.082 | 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".