Bibliographic record
Abstract
Anomalous crustal structure of the northern Juan de Fuca plate is revealed from wide-angle seismic and gravity modelling. A 2-D velocity model is produced for refraction line II of the 1980 Vancouver Island Seismic Project (VISP80). The refraction data were recorded on three ocean bottom seismometers (OBSs) deployed at the ends and middle of a 110 km line oriented parallel to the deformation front of the Cascadia subduction zone and immediately south of the Nootka fault zone. The velocity model is constructed via ray tracing and conforms to travel time observations of direct, converted and reflected phases. Synthetic seismograms are produced from calculated first-arrival phases for comparison with the recorded seismogram sections. Travel time picks for turning ray phases with shot offsets of > 60 km indicate significantly different lower crustal and upper mantle velocity structure toward each end of the profile. The variation in travel times is modelled by a pronounced increase in igneous crustal thickness of the Juan de Fuca plate, from ~ 7 km at the southern part of the model to ~ 10 km at the northern part (a thickness increase of 43%). A complementary 2-D gravity model using the geometry of the velocity model and velocitydensity relationships characteristic of oceanic crust is produced. The densities required to match the gravity field indicate the presence of serpentinized peridotites rather than excess gabbroic crust. Anomalous travel time delays and unusual reflection characteristics observed from proximal seismic refraction and reflection experiments suggest a broader zone of serpentinized peridotites that coincides with the trace of a pseudofault. This correlation implies that the inferred partial serpentinization of the upper mantle may be a consequence of slow-spreading at the tip of a propagating rift.
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) | 0.002 | 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".