Gravity anomaly modelling of multiple geological sources having differing strike lengths and arbitrary density contrast variations
Bibliographic record
Abstract
ABSTRACT A method to compute gravity anomalies of multiple geological sources having variable but finite strike lengths with arbitrary density contrast variations is presented. An ensemble of variable but finite strike limited vertical prisms among which density contrasts vary randomly both with depth and lateral position describes the anomalous source(s). The proposed method has the advantage that it can be applied to compute the gravity anomalies of a variety of geologic sources at both local and crustal scale levels. The applicability of the method is demonstrated with synthetic and real field examples. In the synthetic example, the geology resembles that of a typical rifted sedimentary basin, where thick sectioned sediments with arbitrarily varying density contrasts are concealed under a thick pile of flood basalt. For the real field example, the method is applied to calculate the gravity anomalies of a crustal scale structure across the suture zone between the Superior and Churchill structural provinces in the Canadian Shield. Modelling of real field anomalies reveals that i) the Churchill block is much thicker and ii) the western boundary of the base of the fold belt within the Superior block is shallower than reported in previous studies.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 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".