Vancouver, Canada’s third largest metropolitan area, has the country’s highest seismic risk.
Recent simulations suggest that existing models used to develop current building codes have underestimated the region’s seismic hazard, according to a new study led by researchers from the University of British Columbia. Vancouver is surrounded by mountains and lies in a basin composed of deep sedimentary deposits near the Cascadia Subduction Zone, an active tectonic plate boundary.
This geology is softer and less compact than the surrounding bedrock, and will amplify shaking caused by seismic waves, researchers say. This makes high-rises in the city more vulnerable to damage from a major earthquake than in other regions.
Ground motion models serve as the foundation for Canada’s national seismic hazard model, and they typically rely on past observations of earthquakes from around the world. Seismic codes are based on these, but do not account for Vancouver’s particular geology. Tall buildings constructed before 1990 are most at risk.
Related Stories
| Dec 29, 2011
Seismic safety in question at thousands of California public schools
California regulators responsible for enforcing earthquake safety laws have failed to certify more than 16,000 construction projects in California public schools, increasing the risk that some projects may be unsafe, according to a state audit report.
| Dec 2, 2011
What are you waiting for? BD+C's 2012 40 Under 40 nominations are due Friday, Jan. 20
Nominate a colleague, peer, or even yourself. Applications available here.
| Oct 18, 2011
Michel Bruneau wins 2012 AISC T.R. Higgins Award
The AISC T.R. Higgins Lectureship Award is presented annually by the American Institute of Steel Construction (AISC) and recognizes an outstanding lecturer and author whose technical paper(s) are considered an outstanding contribution to the engineering literature on fabricated structural steel.
| Aug 11, 2010
PCA partners with MIT on concrete research center
MIT today announced the creation of the Concrete Sustainability Hub, a research center established at MIT in collaboration with the Portland Cement Association (PCA) and Ready Mixed Concrete (RMC) Research & Education Foundation.
| Aug 11, 2010
VA San Diego Healthcare System Building 1 Seismic Correction
San Diego, Calif.
Three decades after its original construction in the early 1970s, the Veterans Affairs San Diego Healthcare System Building 1 fell far short of current seismic codes. This not only put the building and its occupants—patients, doctors, nurses, visitors, and administrative staff—at risk in the event of a major earthquake, it violated a California state mandate requiring all hospitals to either retrofit or rebuild.
| Aug 11, 2010
Theater Renovation—A First-Class Production
In 1985, the city of San Diego ordered the historic Balboa Theatre, its beleaguered performing arts center, to be shuttered due to seismic safety concerns. It would take another two decades to restore the landmark building.
| Aug 11, 2010
American Concrete Institute forms technical committee on BIM for concrete structures
The American Concrete Institute (ACI) announces the formation of a new technical committee on Building Information Modeling (BIM) of Concrete Structures.
