The Arctic Ocean earthquake swarm of October and November 2008
Bibliographic record
Abstract
During October and November 2008 an earthquake swarm occurred in the Arctic Ocean off the Queen Elizabeth Islands. The activity was sporadic but reached a peak in mid-November when fifty earthquakes large enough to be located occurred over a two day period (17-18 November). Eleven of the earthquakes, nine of which occurred during those two days, were of magnitude 5.0 or greater. Regional moment tensor inversions were performed for these eleven earthquakes. The majority of the focal mechanisms were indicative of thrust faulting on a NE-SW striking plane roughly parallel to the continental margin. Depths, ranging from 6-20 km, correspond to the mid-crust. It is not clear whether the unusually high non-double couple component for many of the solutions is an artifact of the inversion process or is indicative of a true non-double source. Swarm activity is often associated with magmatic or other geothermal activity and it is possible but not confirmed that the non-double couple component is related to the migration of fluids within the crust. The occurrence of a large number of earthquakes in a small area allows for calibration between magnitude scales for the north, where the attenuation relations are less well known than in southern Canada. A primary observation was the mb determined from Canadian stations (regional distances) tends to be smaller than mb by other organizations using teleseismic data. On the other hand, mb determined from the Yellowknife array data is a good match to the teleseismic magnitude suggesting that this path is close to the global average.
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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 | 0.001 |
| 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".