Dynamic characteristics of three major towers on Parliament Hill, Ottawa, from recorded vibrations during the Val-des-Bois, Quebec, earthquake of June 23, 2010

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Proceedings titleProceedings, Annual Conference - Canadian Society for Civil Engineering
ConferenceAnnual Conference of the Canadian Society for Civil Engineering 2011, CSCE 2011, 14 June 2011 through 17 June 2011, Ottawa, ON
Pages637646; # of pages: 10
SubjectAmbient vibration test; Dynamic characteristics; Fourier amplitude spectra; Geological Survey of Canada; Ground level; Ground-shaking; Kentucky; Ontario; Recorded signals; Seismic evaluation; Vibration modes; Civil engineering; Earthquakes; Felt; Felts; Towers
AbstractThe 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.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271752
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Record identifier9cbb41c8-5e65-425b-96ec-2dd625a29562
Record created2014-03-24
Record modified2016-05-09
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