Precise relocations of slab seismicity in the northern Cascadia subduction zone
Bibliographic record
Abstract
The Gulf Islands region of southwest British Columbia is an ideal location to study, in detail, slab seismicity of the subducting Juan de Fuca plate. Here, there is abundant slab seismicity, a relatively dense network of seismograph stations to obtain accurate hypocenters and some recently deployed three-component broadband stations to constrain the velocity structure. We have relocated slab seismicity near 50 - 60 km depth in the Gulf Island region using a "double difference" earthquake relocation algorithm designed to provide high-resolution relative hypocenter locations over large distances. The precise relative locations obtained for an initial test set of 27 deep earthquakes in a narrow corridor near Saturna Island, B.C., indicates that most of the slab seismicity here is in a three to four kilometer-thick region dipping at 20° to the northeast. There is some suggestion of a deeper parallel band of seismicity (7 - 9 km) below the top of the upper band that may be located in the upper mantle of the Juan de Fuca plate.
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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 | 0.001 | 0.001 |
| 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) | 0.001 | 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".