Waveform tomography strategy for seismic reflection data from the Queen Charlotte Basin of western Canada
Bibliographic record
Abstract
2-D frequency domain waveform tomography was applied to limited offset (maximum offset 3770 m) seismic reflection data from the Queen Charlotte sedimentary basin off the west coast of Canada. The field data were inverted between 7 Hz and 12 Hz with attenuation introduced for frequencies > 10.5 Hz. The starting velocity model was derived from traveltime tomography and the starting attenuation model was a homogeneous Op-model. An inversion strategy was designed to mitigate non-linearity due to the relatively high starting frequency and to recover structures down to 1200 m, twice the depth of coverage possible with ray-based traveltime tomography. There is generally a good agreement between the derived velocity model and a sonic log from a well on the seismic line, and the forward modelled data and field data match well. The velocity model permits the identification of structures in the shallower Pliocene section, which are likely related to strike-slip faulting, that are not readily interpretable on the conventional migrated section.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 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) | 0.002 | 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 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".