Digital accelerograph recordings of the July 15 and 19, 2004 earthquakes, west of Vancouver Island
Bibliographic record
Abstract
Two earthquakes of MW 5.8 [ML 5.5] and MW 6.4 [ML 6.1] occurred on the 15th and 19th of July 2004, respectively, approximately 30 km off the west coast of Vancouver Island. They were shallow strike-slip fault earthquakes (~12 km focal depth). Both earthquakes were felt across Vancouver Island and as far east as the Sunshine Coast (~200 km) and the greater Vancouver region (~300 km). The MW 5.8 earthquake showed observable waveforms on 34 of 60 Internet Accelerograph instruments and triggered two non-communicating (stand alone) strong motion instruments. The MW 6.4 earthquake showed observable waveforms on 41 of 60 Internet Accelerograph instruments and triggered three noncommunicating strong motion instruments. The largest peak horizontal ground accelerations recorded were 6.19 cm/s2 and 13.78 cm/s2 for the MW 5.8 and MW 6.4 events, respectively. This data set is significant because it includes the first widespread earthquake recordings by the new Internet Accelerograph instruments. In this Open File report we present time series plots of the acceleration, and velocity data from the 15th and 19th July 2004 earthquakes. Tabulated station parameters and peak accelerations are given together with maps of the network configuration showing the locations of recorded time series. A sample of stations on the Lower Mainland and in Victoria show a variation in the level of ground shaking based on local site conditions.
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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 | 0.002 | 0.003 |
| 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) | 0.005 | 0.001 |
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".