This is particularly applicable to existing buildings that were constructed prior to modern seismic hazard maps and seismic design provisions. On the other hand, LCRB rendered a smaller torsional angle and absolute displacement of the base isolation system, hence a more stable structural system. Epicenter at 47.3, -70.32 Rivière-du-Loup It is shown that the inelastic responses depend strongly on the torsional stiffness of the system. The earthquake was felt by millions, and damaged some buildings. It is shown that all three codes can limit the ductility demands on the elements to that of a similar but torsionally balanced system when the system is torsionally stiff. (10.2 miles), 1982-12-04 16:08:32 UTC San Francisco, CA. 2014) and Saguenay earthquake in 1988 (Lefebvre et al. (10.2 miles), 1983-05-27 23:03:35 UTC 17.2 km from In the case of Montreal, damages are noted in the masonry cladding of the City Hall of Montreal-East during the magnitude 6 Saguenay earthquake (1988). To date, the geological investigation of the sites suggests that Miramichi, New Brunswick, Canada earthquake sequence of 1982-a preliminary report. ... Local site effect was exemplified on November 25th, 1988, when severe damage was observed to the masonry cladding of the former Montreal East City Hall after the Mw 5.9 Saguenay earthquake, at an epicentral distance of 350 km. The objective of this paper is to describe on-going research on the seismic hazard analysis and vulnerability assessment for the Montreal Urban Community. Val-des-Bois (Québec) earthquake, which occurred on the 23 June 2010. The objective of this paper is to present a methodology for the assessment of post-earthquake functionality of existing Montreal hospitals using fault-tree analysis. The numerical correlation with the observed response is good. (19.2 miles), 1983-06-02 06:30:23 UTC CityNews Montreal 556 views. The last example investigates the influence of initial damage on the seismic response of a gravity dam analyzed using the equivalent static loads. accelerations on the sliding response of gravity dams is significantly higher for near-source records than for far-source 1990). Preceded by a magnitude 4.7 foreshock on November 23, 1988, 4:11 am Eastern time; Aftershock zone 35 km N-S by 35 km E-W; Interesting Features. It leads to a reasonable finite-element mesh size, Correct convergence of energy dissipation is ensured by using the energy equivalence concept. Outside these areas, most of the Canadian Shield and bordering regions have had a very low level of earthquake activity. Nevertheless, seismic vulnerability of these buildings remains to be high for both locations, meaning that should a major earthquake strike near the location, the buildings studied will suffer major damage. Although no major structural failures occurred, there were many examples of poor performance, and in some cases failures, of unreinforced masonry walls. Variability and uncertainty associated with the choice of the models are described and estimated using a second moment analysis. at 06:30 June 02, 1983 UTC, Location: Geological Survey of 18.2 km from HODGSON, E. A. (9.2 miles), 1978-08-01 17:42:56 UTC Similar rotational flows were also observed in sensitive clays in Quebec due to the Val de Bois earthquake in 2010 (Demer et al. CANADA EARTHQUAKE An earthquake of magnitude 6.0 occurred in the saguenay region of the province of Quebec on Friday 25 November 1988 647-654. La Pocatière Mtmoires de la SociCtC Royale de Canada. In light of these observations, the implications of seismic ground motions having different A/V ratios on engineering design were discussed, and an example to incorporate this ratio into the specification of seismic design forces for building structures was illustrated. Since the 1971 San Fernando earthquake in California, procedures to evaluate accurately the flexural and shear behavior of reinforced concrete bridge piers, as well as retrofit techniques to address economically the most common deficiencies, have been elaborated. Similarly, SLRS faults should not necessarily be considered to be the reactivated structures for most small to moderate earthquakes (M>4.5). The 1988 Saguenay earthquake struck Quebec, Canada with a moment magnitude of 5.9 on November 25. For actual seismic records, the cumulative sliding displacement for a given peak ground acceleration due to low frequency western North American records can be 3-4 times larger than the corresponding sliding displacements due to high frequency eastern records. Geological Survey of Canada, Open File Report No. When an earthquake occurs, hospitals are expected to remain functional as they play a crucial role in emergency care operations. Chapter 3. A dam, 55 m high and having an initial crack opening of 2 mm at the base or near the crest and subjected to two different accelerograms, is analysed. The significant role played by the presence of soft subsoil in amplifying the ground motion and resulting damage is illustrated. The CSZ is the best studied seismic zone; there, earthquakes occur in the Canadian Shield, mostly in a 30×85 km rectangle elongated along the trend of the St. Lawrence River with local variations in focal depth distribution. In addition to seismic loss curves that consider a comprehensive event set of regional seismicity, conditional loss distributions for critical scenarios are developed. The performance and operation of elevator earthquake protection devices, seismic switches and counterweight derail detection devices, did not fully meet expectations but they did significantly reduce damage and the potential for injury. This paper discusses the local approach of fracture using damage mechanics concepts to evaluate the seismic response of concrete gravity dams. The experimental results showed a significant initial transient frictional response at frequencies above 1 Hz before the dynamic, steady-state, frictional behavior was achieved. 4.3 magnitude earthquake 1988-11-23 09:11:27 UTC at 09:11 November 23, 1988 UTC Location: Epicenter at 48.134, -71.203 31.2 km from Jonquière (19.2 miles) Enter your email address to restore your content access: Note: This functionality works only for purchases done as a guest. We suggest, however, that pre-existing faults related to the SLRS do not explain all features of the seismicity. 82-33. The second example uses Koyna dam as a test case to compare the damage mechanics theory with other theories on cases of reservoir overflow. Geoscience Canada, 4: 41 -45. Epicenter at 47.7, -69.93 It could be felt as far as Toronto, Halifax, and Boston. For high-frequency ground motion, the seismic hydrodynamic pressure inside the crack, at the base of the dam, appears to be 50 per cent higher than the corresponding hydrostatic pressure. ... 1988 - … The synthetic motions, generated by following the proposed procedure yielded results very similar to the historical records for both the ENA and WNA groups. (3.2 miles), 1985-04-12 05:27:29 UTC Using a three element single mass model, this paper presents the ductility demands on the elements of torsionally unbalanced systems when subjected to strong earthquake shaking. The Saguenay earthquake of November 25, 1988-processed strong motion records. of the peak horizontal and vertical accelerations, yielded good approximations of the minimum safety factors against sliding 11.2 km from Using response spectrum analysis without including accidental torsion may lead to excessive additional ductility demand on the stiff edge element. La Malbaie This paper contains selected ground motion records in the form of acceleration-time histories, obtained from the Geological Survey of Canada, and corresponding response spectra. The experimental results are then compared with a smeared cracked finite-element simulation using a nonlinear concrete constitutive model based on fracture mechanics. Permeability anisotropy of natural clays as a function of strain, Simulation of groundwater flow in complex multiaquifer systems: Performance of a quasi three-dimensional technique in the steady-state case, Ongoing geological and geotechnical investigations are under way for two sites in Ferland, Quebec, where sand boil deposits, ground fissures, and liquefaction-related damage to homes were documented immediately following the, Des études géologique et géotechnique se poursuivent sur deux sites à Ferland, Québec, cardes dépôts de sables sujets au bouillonnement, des fissures dans le sol, et des dommages à des résidences reliés à la liquéfaction ont été notés immédiatement après le tremblement de terre de, Copyright © 2020 Canadian Science Publishing, Forgot password? at 09:11 November 23, 1988 UTC, Location: It could be felt as far as Toronto, Halifax, and Boston. Geological Survey of Canada. It was also found that for ENA type earthquakes, a load combination consisting of the vertical PGA applied simultaneously with 30% of the horizontal PGA was more critical then the usual combination (100%H with 30% V) and represented more realistically the maximum response predicted from the time-history analyses. (18.2 miles), 1925-03-01 02:19:18 UTC This 1988 earthquake occurred in a remote area of the Saguenay region of Quebec, which is considered Canada's biggest quake centre outside British Columbia. Beaupré A. Balkema Publishers, Rotterdam. The district of Montreal-East is both a residential and industrial district with several oil refineries and port facilitites. It is now commonly accepted in the earthquake engineering community that soft soils can play a large role in ground motion and must be included in seismic zoning. Universal earthquake in Canada, and its maravelous effects. LAFLAMME, J.-C.K. The Saguenay earthquake of 1983. 20.2 km from WEICHERT, D. H., and MUNRO, P. S. 1987. The pounding response of the frames was measured for various earthquake intensities and initial separations. Epicenter at 47.04, -70.93 1899. The 1988 Saguenay earthquake struck Quebec, Canada with a moment magnitude of 5.9 on November 25. An inspection of the cable-stayed Shipshaw bridge near Jonquiere, Quebec, following the 1988 Saguenay earthquake (M(L) = 6.0) revealed the failure of one anchorage plate connecting the steel box girders to one abutment. Quebec Province, Canada. In both cases, soft soils have increased the ground shaking and played a major role in human and economic losses. November 25, 1988, near Chicoutimi in the Province of Quebec, How to deal with shortage of drinking water, How to protect yourself during an earthquake, Montréal Charter of Rights and Responsibilities, Mercier–Hochelaga-Maisonneuve (in French), Rivière-des-Prairies–Pointe-aux-Trembles (in French), Villeray–Saint-Michel–Parc-Extension (in French). Hospital functionality relies on the good performance of a large number of critical sub-systems, components and equipment. The M = 6 Saguenay earthquake of November 25, 1988, near Chicoutimi in the Province of Quebec, Canada: preliminary NCEER strong ground motion data report. The November 25, 1988, Saguenay earthquake prompted a site visit by a team representing the Canadian National Committee on Earthquake Engineering.

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