Intense <i>PP</i> reflection beneath the aseismic forearc slope of the Japan Trench subduction zone and its implication of aseismic slip subduction
Bibliographic record
Abstract
Strong anticorrelation between intensity of plate boundary PP reflection and seismicity had been revealed by a seismic reflection‐refraction survey conducted in 1996 in a seismic‐aseismic boundary region on the forearc slope of the Japan Trench. Amplitude of the strong reflection was explained by the presence of a thin layer (∼200 m) of low P wave velocity (3–4 km/s) at the top of the plate boundary. We conducted another seismic survey in 2001 in the same region as that of 1996 and verified the strong anticorrelation with planer extension along the plate boundary. Therefore existence of the thin layer of low P wave velocity along the plate boundary is expected within the aseismic regions. Extremely low P wave velocities along the plate interface at depths of around 10–20 km suggest that the layer may include fluid, clay minerals, and/or serpentine‐chlorite. Because these materials have low mechanical strength or cause low friction between the overriding and subducting plates, large strain may not be accumulated and aseismic slip may be dominant. As a result of the above speculation, the intense reflection observed within the aseismic regions may imply aseismic slip between the plates. Amplitude of the plate boundary PP reflection phase was found maximum about reflections from deeper plate interface, although the reflected waves propagate for longer distances. One possible explanation to this phenomenon is the presence of serpentinized wedge mantle material that is buoyancy‐driven to move along the top of the slab.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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".