Edad, dinámica geomorfológica y tipología de barrancas en el sector norte del volcán Popocatépetl, México
Bibliographic record
Abstract
This study investigates the age and morphodynamics of ravines (barrancas) developed in late Pleistocene to Holocene pyroclastic deposits on the northern slope of Popocatépetl volcano by means of stratigraphic analyses, 14 C dating and dendrogeomorphologic methods.On this basis, we propose a typology for the ravines according to their origin, age and geomorphological dynamics.The oldest and most stable ravines formed in pyroclastic deposits emplaced at ~17000 cal.yr B.P.; their slopes became relatively stable by ~6000 cal.yr B.P., were mantled by tephra from the 5600 -5,900 and ~1100 cal.yr B.P. Plinian eruptions of Popocatépetl, and have been inactive for at least 200 yr, despite their young appearance.The younger and more active ravines were excavated in pyroclastic deposits from the last Plinian eruption (~1100 cal.yr B.P), during the final stages of the eruption or shortly thereafter.Today these ravines are characterized by unstable conditions and are episodically exposed to lahars, as is the case of the Huiloac ravine.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".