An Interferometric Solution for Non-stationary Shear-wave Statics
Bibliographic record
Abstract
Summary Converted-wave data processing requires the computation of shear-wave statics for the receiver side. Conventionally this is done under the assumption of surface consistency. However, if the velocity change between the low velocity layer (LVL) and the medium underneath is smooth, or if the base of the LVL is structurally complex, the vertical raypath assumption that supports the surface consistent approach is no longer valid. This feature results in a non-stationary change of the statics that needs to be addressed in order to properly solve the problem. In this work the radial-trace (R-T) transform is used for moving the data to a raypath consistent framework where the statics change was showed to be approximately stationary. In this domain traveltime interferometry was applied to retrieve the delays caused by the near surface. Cross-correlation of the delayed traces with a model trace free of statics was showed to return a cross-correlation function that carries the statics information. These functions were convolved with the original traces to remove the delay caused by the near surface. Stacked sections computed using surface-and raypath-consistent solutions showed how the latter one effectively removed the statics by addressing the non-stationarity of the problem.
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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 | 0.000 | 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) | 0.000 | 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".