The Composite Azimuthal Effect of Intrinsic and Scattering Attenuation on 3D Seismic Data
Bibliographic record
Abstract
Summary The seismic attenuation we observed from previous studies at various sites suggested the complexity of imaging in a hardrock environment. Firstly, the attenuation effect is extremely strong from VSP measurements. It causes the loss of unconformity images along distinct sections. Secondly, the strong attenuation is highly localized. Observation from the surface 3D seismic datasets indicated that the low Q structures occur vertically with specific elongated shapes. We conduct a 3D full waveform Finite-Difference (FD) viscoelastic modelling to illustrate this type of complexity. The 3D model consists of vertical low-Q-low-Vp and high-Q-high-Vp zones. Thus, both of the intrinsic and scattering attenuation effects are embedded. The result implies the surface observed seismic amplitude can exhibit azimuthal variations under the influence of both of these two effects. The local amplitude fast decaying direction may not align with the true low Q or high velocity directions.
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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 | 0.000 |
| 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".