Variations in Reflection Signature and Slip Behavior of the Subduction Interface Offshore Alaska Peninsula From 152° to 161°W
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Bibliographic record
Abstract
We present seismic reflection images of the plate interface down to a depth of ∼65 km across ∼130,000 km 2 offshore Alaska Peninsula. A thin reflection package (<2 km) characterizes the megathrust at depths <24–34 km, marking localized brittle deformation that likely hosts the largest seismic asperities. The reflection band thickness transitions from 2 to 5 km over depths of ∼24–41 km, suggesting a thickening zone of cumulative deformation and greater heterogeneity corresponding to conditionally stable megathrust behavior. At depths >35–41 km, the reflection package maintains a thickness of 5–6 km and marks the predominantly aseismically slipping megathrust areas. Historic and recent megathrust earthquakes in the southwest Kodiak Asperity and Semidi Segment generally occur within the thin and/or transitional reflection bands. The 2020 Simeonof and earlier M 7+ earthquakes in the Shumagin Gap are estimated to also rupture the shallowest section of megathrust characterized by the thick reflection band (∼35–41 km depth). Although the shallow part of the plate boundary (< ∼ 25 km deep) in the Semidi and Shumagin segments did not rupture in recent 2020 M 7.8 Simeonof and 2021 M 8.2 Chignik earthquakes, the seismic properties of the megathrust suggest it may be capable of earthquake slip in the future, as may have occurred in 1788.
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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 | 0.001 |
| 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) | 0.000 | 0.000 |
Machine scores (provisional)
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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 it