Bibliographic record
Abstract
We have experimentally determined the P-wave velocities of 68 typical UHP metamorphic rock samples among which 31 were collected from the CCSD (Chinese Continental Scientific Drilling) main hole and 37 from the surface outcrops in the Sulu orogenic belt (China) at ambient temperature and hydrostatic confining pressures up to 800 MPa. The velocity-pressure curves can be well described by a simple expression: V(P)=V_0+DP-B_0exp(-kP), where V_0 is the projected velocity at zero pressure if both porosity and cracks were absent; D is the intrinsic pressure derivative of velocity in the linear elastic regime; B_0 is the initial velocity drop caused by the presence of pores and cracks at zero pressure; and k is the decay constant of the velocity drop, which controls the shape of the velocity-pressure curves in the nonlinear poro-elastic regime. The above equation was used by previous workers as an empirical formula to describe the relationship between seismic velocity and confining pressure. Here we show that the equation can be directly derived on a rather general theoretical basis. The derivation has provided a clarification for the physical meaning of each parameter in the equation. It is suggested that henceforth the seismic velocities of rocks should be published in terms of these four parameters rather using tedious tables to list each velocity at each pressure for each sample as done before. The statistical properties of P-wave velocities in the Sulu UHP rocks provide a complete set of basic information for the interpretation of field seismic data from the root zones of continental convergent orogenic belts and modern and ancient subduction zones.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".