A theoretical note on converted wave amplitude variation with offset in viscoelastic media
Bibliographic record
Abstract
Approximate converted PS-reflection coefficients for weak contrast interfaces separating isotropic viscoelastic media have been derived in this paper. This problem has been investigated by others but the changes in the attenuation angles across the boundary have been neglected. In this paper, we remove this limitation by deriving a formula for the PS-wave reflection coefficient considering the Snell's law which relates the transmitted attenuation angle for S waves in terms of incident attenuation angle. The AVO equation that we obtained is a complex function which for small angles has four terms from zeroth order up to the third order in sinθP. Viscoelastic converted PS-wave AVO comparing to the elastic converted PS-wave has two more term which are zeroth and second order in sinθP. These extra terms come from the inhomogeneity of the waves. We also compare the approximate linearized solutions with the exact solutions of Zoeppritz equations for three rock contrast model. Presentation Date: Monday, October 17, 2016 Start Time: 1:00:00 PM Location: 174 Presentation Type: ORAL
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".