Combined controlled source electromagnetic, reflection seismic and borehole study at the shallow-water edge of gas hydrate stability offshore Vancouver Island, IODP Expedition Site U1329
Bibliographic record
Abstract
On the northern Cascadia margin oshore Vancouver Island abundant gas hydrate deposits have been found and characterized through various geophysical imaging techniques and by deep drilling of the Ocean Drilling Program (ODP) Leg 146 and Integrated Ocean Drilling Program (IODP) Expedition 311. The Site U1329 was drilled during IODP Expedition 311 to investigate the shallow edge of the gas hydrate stability zone (GHSZ) in water depths near 900 m. A small amount of gas hydrate near the predicted base of the GHSZ was detected. Borehole wireline, logging-while-drilling (LWD), and core data from Site U1329 provide ground-truth information on the physical properties of the sediments. We calculated the gas hydrate content from the chlorinity data and electrical resistivity data using Archie’s law. We compare the results to the regional information gathered by reection seismic and controlled source electromagnetic (CSEM) data. The preliminary analysis of the CSEM data along proles intersecting at Site U1329 show lateral variability in the inverted apparent resistivity values which may indicate a variable gas hydrate or free gas concentration within the top 100 mbsf. A pronounced resistivity anomaly further upslope at the edge of the gas hydrate stability zone may be related to gas hydrate occurrences due to localized venting along landward dipping thrust faults.
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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 | 0.000 |
| 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 | 0.000 | 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".