Horizontal-to-vertical ground motion relations at short distances for four hard-rock sites in eastern Canada and implications for seismic hazard assessment
Bibliographic record
Abstract
Horizontal-to-vertical (H/V) ground-motion relations were determined for four long-running, three-component broadband seismograph stations situated on hard rock in eastern Canada. We focused our attention on earthquakes of magnitude 2.5 and greater at close range (<200 km) to each station because most earthquake damage results from nearby earthquakes. An H/V value of ∼2 is the general average for eastern Canada, although there are some differences from station to station. H/V in general increases with increasing frequency. There is little or no systematic variation in H/V as a function of either distance or magnitude. The H/V ratios obtained in this study are somewhat higher than previously published values. Much of the difference appears to be due to the use of different definitions of H rather than to differences in the data sets and/or methods of data processing and analysis. These results raise questions regarding the best definition for H for use in hazard assessment.
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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 | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".