Dynamic characteristics of three major towers on Parliament Hill, Ottawa, from recorded vibrations during the Val-des-Bois, Quebec, earthquake of June 23, 2010
Bibliographic record
Abstract
The magnitude (Mw) of 5.0 Val-des-Bois earthquake that occurred in Quebec on June 23, 2010 was the biggest recent earthquake in eastern Canada. It produced the strongest shaking ever felt in Ottawa. The ground shaking was widely felt in Ontario and Quebec, and it was also felt in the US as far as Kentucky. A number of records from this event were compiled and processed by the Geological Survey of Canada. Of special importance for this paper are the recorded vibrations of three towers of the Parliament Hill buildings in Ottawa, i.e., the Peace Tower of the Centre Eilock, the Mackenzie Tower of the West Block, and the South-West Tower of the East Block. In total 27 records were obtained at the towers, including records at the ground level, at the middle and at the top of the towers. These are the first significant records obtained on the towers during an earthquake. The records were processed to determine the dynamic characteristics of the towers. Based on the Fourier amplitude spectra of the recorded signals, the natural frequencies of the vibration modes were determined. These were found to be very similar to those from ambient vibration tests. The results from this study are very important for seismic evaluations of the towers on Parliament Hill.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| 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".