Mapping the ductile-brittle transition of dome lavas
Bibliographic record
Abstract
The failure of magma and onset of an explosive eruption is commonly preceded by accelerations in discharge rate and seismic activity. As magma is mechanically forced through the ductile-brittle transition, cracks propagate and coalesce, thereby generating an increasing amount of seismic energy, which can be used to forecast the onset of explosive eruptions. In this study dome lavas from Volcan de Colima (Mexico) are deformed at 930 °C under various stresses (1 to 76 MPa) in a uniaxial press. Crack propagation in the magma is monitored by two acoustic emission sensors and used as a proxy to forecast the time of failure (e.g., Kilburn, J. Volcanol. Geotherm. Res. 2003). We assess the degree of fracture damage and anisotropy of the fracture network in 3-D via high-resolution (30 micron) Neutron Computer Tomography imaging. Tomography images of magmas experimentally deformed in the ductile-brittle transition reveals that at high strain rate, failure occurs rapidly along macroscopic cracks and requires less strain than failure at lower strain rate. The time window to accurately forecast the failure of magma thus diminishes with strain rate.
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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) | 0.004 | 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".