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 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) | 0.001 | 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) | 0.000 | 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".