Extraction of absolute<i>P</i>velocity from receiver functions
Bibliographic record
Abstract
Receiver functions constitute an important tool in regional and global studies of crust and upper-mantle structure and are frequently employed to constrain crustal thickness and bulk VP/VS ratio. The methods commonly used to compute these parameters assume a known crustal P velocity; however, this quantity trades off with crustal thickness. We demonstrate that P velocity and VP/VS ratio can be readily computed through solution of a linear system of equations incorporating traveltimes of direct conversions and free-surface reverberations, representing a range of horizontal slowness. Determination of crustal thickness follows trivially. We apply this approach to data from station HYB on the Indian craton to determine bulk VP/VS ratio, P velocity and thickness of 1.79 ± 0.007, 6.1 ± 0.13 km s−1 and 30.5 ± 0.8 km, respectively. The addition of average crustal P velocity to the suite of parameters accessible from receiver function data may prove useful in constraining bulk crustal composition and its secular evolution.
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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) | 0.007 | 0.001 |
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".