we could have an earthquake at any moment
Along the Pacific Ring of Fire, cities are reckoning with a truth long deferred: the ground beneath their streets holds a memory of violence, and most of what has been built above it was never designed to survive it. Vancouver, facing a one-in-five chance of a major earthquake within fifty years, is moving to grade every building in the city for seismic vulnerability — a quiet but consequential act of collective honesty about risk, resilience, and who bears the cost when the earth finally moves.
- Vancouver's seismic policy lead has presented city council with a plan to assign every building a risk ranking, confronting the reality that a 7.2-magnitude quake could kill or severely injure up to 1,350 people and displace more than a third of the city for months.
- The vulnerability is not evenly spread — five building types carry nearly 80% of the risk, with pre-code single-room-occupancy hotels among the most exposed, concentrating danger in the city's most economically precarious communities.
- Whether to publish the grades publicly has already fractured the conversation: tenant advocates demand transparency, while property owners warn that building-level risk scores will crater leasing prospects, insurance rates, and access to credit.
- Engineered timber is emerging as a promising material for new construction, with cross-laminated timber towers self-centering after 100 simulated earthquakes in testing — though Japan's century-hardened seismic codes caution that what survives moderate shaking may not endure the most violent events.
- Cities like Seattle, San Francisco, and New Zealand have attempted similar risk-grading systems, with mixed results — New Zealand is already walking back its program, easing deadlines and removing thousands of buildings, signaling how difficult political will is to sustain.
Vancouver is preparing to do something most North American cities have never attempted: grade every building in the city for how it will behave when the ground shakes. Presented to city council by seismic policy lead Micah Hilt, the plan would send design professionals to inspect structures from the street and assign each a risk ranking — a systematic inventory of which buildings are most likely to fail. The urgency is real. Vancouver sits above a fault line that hasn't ruptured in over three centuries, and the odds of a catastrophic quake in the next fifty years are one in five.
The human cost of inaction has been modeled in detail. A 7.2-magnitude earthquake in the Georgia Strait could kill or severely injure up to 1,350 people, heavily damage nearly 6,100 buildings, displace more than a third of the city's population for months, and generate $17 billion in direct economic losses. The risk is concentrated: five building types account for nearly 80% of the city's seismic vulnerability, clustered in six neighborhoods. Pre-code single-room-occupancy hotels rank among the most exposed structures.
Vancouver would not be the first to try this. Seattle targeted unreinforced masonry after similar grading; San Francisco and New Zealand built retrofit registers — though New Zealand is now easing its program, removing thousands of buildings from the scheme. The question of transparency has already created friction. Tenant advocates want the data public so residents know what they're living in. Property owners warn that published risk grades will damage leasing, insurance, and lending. The grades will shape policy regardless, but who gets to see them remains contested.
Meanwhile, the question of what to build next increasingly points toward engineered wood. Lighter buildings experience smaller seismic forces, and shake-table testing has confirmed timber's promise: a ten-storey cross-laminated timber tower at UC San Diego absorbed more than 100 simulated earthquakes without structural damage, self-centering each time. A University of Auckland test this month produced the same result with a two-storey timber structure. Yet Japan's seismic codes — refined over a century since the 1923 Great Kanto earthquake killed more than 100,000 people — demand far more robust systems, a reminder that what performs well in moderate seismic zones may not be sufficient in the most violent ones. As Ring of Fire cities race to assess what already stands, what to build next remains an open and consequential question.
Vancouver is about to do something most North American cities have never attempted: systematically grade every building in the city for how it will behave when the ground shakes. The plan, presented to city council by seismic policy lead Micah Hilt, would send design professionals out to inspect structures from the street and assign each one a risk ranking—a straightforward inventory of which buildings are most likely to fail in the next major earthquake. It's a practical response to an uncomfortable fact: Vancouver sits directly above a fault line that hasn't ruptured in more than three centuries, and the odds of a catastrophic quake in the next fifty years are one in five.
The stakes are not abstract. Hilt and Natural Resources Canada scientist Tiegan Hobbs modeled what a 7.2-magnitude earthquake centered in the Georgia Strait would do to the city. The numbers are stark: up to 1,350 people dead or severely injured, nearly 6,100 buildings heavily damaged, more than a third of the city's population displaced for months, and direct economic losses approaching $17 billion. Yet Hilt told council yesterday that "we could have an earthquake at any moment." The city's vulnerability is concentrated. Five building types account for nearly 80 percent of the risk, clustered in six neighborhoods that together carry about 65 percent of it. Single-room-occupancy hotels—nearly all built before seismic design standards existed—rank among the most exposed structures in the city.
Vancouver would not be the first to attempt this. Seattle launched a "fix-the-bricks" campaign targeting unreinforced masonry after similar risk grading. San Francisco and New Zealand have built registers that now guide retrofit programs, though New Zealand is currently overhauling its system, easing deadlines and removing thousands of buildings from the scheme. The question of whether to publish the grades publicly has already created tension. Tenant advocates want the data transparent so residents know what they're living in. Property owners have warned the city that releasing building-level risk assessments would damage leasing prospects, insurance rates, and lending terms. The grades would steer policy and retrofit incentives regardless, but transparency remains contested.
While cities inventory what already exists, the question of what to build next increasingly points toward engineered wood. The material's lightness matters enormously during earthquakes—lighter buildings experience smaller seismic forces, an advantage that becomes more pronounced the taller the structure. Shake-table testing has borne this out repeatedly. At UC San Diego, a ten-storey cross-laminated timber tower absorbed more than 100 simulated earthquakes without structural damage, returning to center after each one. The principal investigator, Shiling Pei, found the results almost disappointingly perfect: "if you're looking for damage, this is a very boring test." A University of Auckland test this month produced identical results. A two-storey timber structure, designed to mimic the medium-density townhouses now common across New Zealand, withstood 100 strong shakes with its main timber elements undamaged and the building self-centering each time. Ashkan Hashemi, one of the researchers, noted that "they're not used to seeing a building sustain even one major earthquake."
But the promise of timber has limits. Japan's seismic codes, refined over more than a century since the 1923 Great Kanto earthquake killed more than 100,000 people in Tokyo and Yokohama, push engineers toward heavier framed systems and far more robust connections than the panelized construction used elsewhere. Those codes represent some of the world's first modern seismic standards, written in response to catastrophe. The implication is clear: what works in moderate seismic zones may not be sufficient in the most violent ones. As Vancouver and other Ring of Fire cities race to assess their existing building stock and debate how to retrofit it, the question of what new construction should look like remains unsettled—and the answer may depend on where you build.
Notable Quotes
If you're looking for damage, this is a very boring test.— Shiling Pei, principal investigator of UC San Diego timber tower shake-table test
They're not used to seeing a building sustain even one major earthquake.— Ashkan Hashemi, University of Auckland timber resilience researcher
The Hearth Conversation Another angle on the story
Why does Vancouver need to grade every building when they already know earthquakes are a risk?
Because broad risk models only work by building type. You can't retrofit what you don't know is dangerous. The grades let the city see exactly which structures in which neighborhoods pose the highest threat, so resources go where they matter most.
And the property owners don't want this public?
They're worried about the cascade—if a building gets a bad grade, tenants leave, insurance premiums spike, lenders get nervous. It's not irrational. But the grades exist whether they're published or not. The real question is whether transparency drives faster retrofits or just punishes owners who can't afford them.
So timber buildings just bounce back after earthquakes?
In the tests, yes—completely. A ten-storey timber tower took over 100 simulated quakes and walked away undamaged. But Japan's experience shows that in the most violent seismic zones, you need heavier connections and stiffer frames. Timber works beautifully in moderate risk areas. In extreme ones, the rules change.
What happens if Vancouver gets hit before they finish grading?
That's the unspoken urgency. The modeling shows 1,350 deaths from a single 7.2-magnitude event. Hilt said it plainly: we could have an earthquake at any moment. The grading isn't prevention. It's triage.