EFFECT OF GROUND MOTION PARAMETERS ON THE SEISMIC VERTICAL-TO-HORIZONTAL ACCELERATION RATIOS
Bibliographic record
Abstract
Recent studies clearly show the necessity of including the vertical component of earthquake ground motions in the seismic analysis and design of structures. This study investigates the effects of earthquake magnitude (Mw), epicentral distance (Repi), and soil condition according to the average shear wave velocity (Vs30) on both the vertical-to-horizontal (V/H) spectral accelerations (SA) and peak ground accelerations (PGA) in the Eastern Canada region. To this end, 248 sets of records were selected from 67 earthquakes that occurred in the studied seismic region on different soil conditions, with a magnitude (Mw) of 3.0 and above, and an epicentral distance (Repi) of less than 150 km. In all cases, the computed average trendlines of PGA and SA ratios were found to be higher than the empirical ratio of 2/3 recommended in the current NBC edition. Moreover, a significant increase in the PGA ratios was observed with larger earthquake magnitude (Mw), reduced distance from the epicentre (Repi), and smaller shear wave velocity (Vs30). Likewise, notable impacts of earthquake magnitude and soil condition on the V/H SA ratios were observed. In this regard, the average V/H SA ratio increased for periods up to 2.0 sec for larger earthquake magnitudes, and the ratio increased at soil conditions with smaller shear wave velocity (Vs30) for periods less than 0.5 sec. Finally, no correlation between the epicentral distance and the SA ratios was concluded.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".