Consequences on Residential Buildings in Greater Montreal for a Repeat of the 1732 M5.8 Montreal Earthquake

Rosset, Philippe; Chouinard, Luc; Nollet, Marie‐José

doi:10.1007/978-981-19-0507-0_58

Cited by 5 publications

(10 citation statements)

References 12 publications

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“…Finally, the content losses are based on the Hazus approach, which has not been val- A concomitant study to estimate the annualized earthquake losses in the MMC have shown that the losses are proportional to the total value and the average ages of the buildings by DA [32,33]. Indeed, the year of construction is used to select the corresponding fragility for a given design code level as exemplified in Figure 9 for the wood-frame houses, the oldest buildings having the worst performance.…”

Section: Discussionmentioning

confidence: 99%

“…In the Island of Montreal, a screening of the buildings district by district to classify them as a function of construction type (wood, masonry, concrete, steel or mobile house, as defined in Table 5.1 page 5-6 in [9]) has been performed. For municipalities outside Montreal, similar rules have been adopted, e.g., single-family houses and multiplex up to four dwellings built after 1875 are wood-frame houses and, before this date, unreinforced masonry houses (refer to [1] for more details). The map in Figure 6 shows the 870,000+ buildings grouped by types and number in each DA.…”

Section: Exposure Modelmentioning

confidence: 99%

“…Several previous studies have highlighted the potential losses due to a large earthquake in the region of Montreal [1][2][3][4][5]. Indeed, the Metropolitan Community of Montreal (MMC) comprises approximately half the population of Quebec and is the second most populous city in Canada, with an average density of population around 1000 people per km 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In Canada, the development of the Canadian version of the Hazus software, based on version 2.1 [23], has allowed Ploeger et al [24] to apply the FEMA approach to downtown Ottawa, Canada, for a scenario earthquake of M6.5 at an epicentral distance of 15 km and depth of 10 km. In the Montreal region, several analyses were performed for residential buildings' damage and losses, and associated human impacts, for deterministic and probabilistic scenarios (e.g., [1,5]). For these analyses, detailed soil-condition mapping, as well as an exposure model at the scale of the census dissemination areas, were compiled.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the 2020 Seismic Hazard Update on Residential Losses in Greater Montreal, Canada

Rosset,

Long,

Chouinard

2023

GeoHazards

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Greater Montreal is situated in a region with moderate seismic activity and rests on soft ground deposits from the ancient Champlain Sea, as well as more recent alluvial deposits from the Saint Lawrence River. These deposits have the potential to amplify seismic waves, as demonstrated by past strong, and recent weak, earthquakes. Studies based on the 2015 National Seismic Hazard Model (SHM5) had estimated losses to residential buildings at 2% of their value for an event with a return period of 2475 years. In 2020, the seismic hazard model was updated (SHM6), resulting in more severe hazards for eastern Canada. This paper aims to quantify the impact of these changes on losses to residential buildings in Greater Montreal. Our exposure database includes population and buildings at the scale of dissemination areas (500–1000 inhabitants). Buildings are classified by occupancy and construction type and grouped into three building code levels based on year of construction. The value of buildings is obtained from property-valuation rolls and the content value is derived from insurance data. Damage and losses are calculated using Hazus software developed for FEMA. Losses are shown to be 53% higher than the SHM5 estimates.

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Section: Discussionmentioning

confidence: 99%

Section: Exposure Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the 2020 Seismic Hazard Update on Residential Losses in Greater Montreal, Canada

Rosset,

Long,

Chouinard

2023

GeoHazards

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“…The current population of the Montreal Metropolitan Community (MMC) is around 4 million in an urbanized area of more than 4370 km 2 . In the event of a repetition of the 1732 earthquake, Rosset et al [4] have estimated that 12% of the residential buildings could expect extensive to complete damage. The repair and replacement costs could reach 12% of the total portfolio value in Montreal and 0.04% in surrounding municipalities, with nonstructural damage accounting for 80% of the total damage on average.…”

Section: Introductionmentioning

confidence: 99%

Vs30 Mapping of the Greater Montreal Region Using Multiple Data Sources

Rosset,

Takahashi,

Chouinard

2023

Geosciences

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The metropolitan community of Montreal (MMC) is located in Eastern Canada and included in the western Quebec seismic zone characterized by shallow crustal earthquakes and moderate seismicity. Most of the urbanized areas are settled close to the Saint-Lawrence River and its tributaries and within the region, delimiting the extension of the clay deposits from the Champlain Sea. The influence of these recent and soft deposits on seismic waves has been observed after the 1988 M5.8 Saguenay earthquake and has proven to be crucial in seismic hazard analysis. The shear-wave velocity Vs averaged over the 30 m of soil, abbreviated Vs30, is one of the most used parameters to characterize the site condition and its influence on seismic waves. Since 2000, a site condition model has been developed for the municipalities of Montreal and Laval, combining seismic and borehole data for risk mitigation purposes. The paper presents an extended version of the Vs30 mapping for the entire region of the MMC, which accounts for half of the population of Quebec, including additional ambient noise recordings, recently updated borehole datasets, geological vector map and unpublished seismic refraction data to derive Vs profiles. The estimated Vs30 values for thousands of sites are then interpolated on a regular grid of 0.01 degrees using the inverse distance weighted interpolation approach. Regions with the lowest estimated Vs30 values where site amplification could be expected on seismic waves are in the Northeastern part and in the Southwest of the MMC. The map expresses in terms of site classes is compared with intensity values derived from citizen observations after recent felt. In general, the highest reported intensity values are found in regions with the lowest Vs30 values on the map. Areas where this rule does not apply, should be investigated further. This site condition model can be used in seismic hazard and risk analysis.

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Earthquake economic loss assessment of existing concrete shear wall residential buildings in Eastern Canada

Montazeri,

Abo El Ezz

2024

Earthquake Engineering and Resilience

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Past major earthquakes have demonstrated that a significant proportion of existing residential buildings are vulnerable to seismic hazards, resulting in economic and social losses. The assessment of earthquake‐induced losses is crucial for devising strategies aimed at enhancing seismic resilience through mitigation plans and emergency response measures. This study intends to provide an analytical methodology for evaluating economic losses for existing residential concrete shear wall buildings in Eastern Canada seismic zones based on Canadian‐compatible seismic capacity parameters. A sampled data set related to residential buildings in Montreal was analyzed and statistical distributions were developed that represent the proportion of buildings in different seismic design code levels and number of stories. Vulnerability analyses were performed, which involved estimating buildings' response under seismic hazard inputs according to the 2020 National Building Code of Canada and conducting loss assessment for structural components, nonstructural displacement‐sensitive components, nonstructural acceleration‐sensitive components, and contents. The results of vulnerability analyses in terms of loss ratio curves showed that the seismic performance varies between mid‐rise and high‐rise concrete shear wall buildings with different seismic design code levels, and nonstructural displacement‐sensitive components exerted the most significant influence on overall economic losses among building components. In addition, a comparison was conducted between Canadian‐compatible economic loss ratio curves and those developed based on the standard seismic capacity parameters in the Hazus technical manual and differences in predicted loss ratios were discussed. The developed loss ratio curves can be integrated into regional scale loss assessment tools for rapid estimation of earthquake‐induced economic losses for concrete shear wall buildings as a function of seismic intensity.

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Consequences on Residential Buildings in Greater Montreal for a Repeat of the 1732 M5.8 Montreal Earthquake

Cited by 5 publications

References 12 publications

Influence of the 2020 Seismic Hazard Update on Residential Losses in Greater Montreal, Canada

Influence of the 2020 Seismic Hazard Update on Residential Losses in Greater Montreal, Canada

Vs30 Mapping of the Greater Montreal Region Using Multiple Data Sources

Earthquake economic loss assessment of existing concrete shear wall residential buildings in Eastern Canada

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