B.C. homes need a big fix before the big one hits, says seismic engineer

As a parentraising three young children in an earthquake zone, I've spent the last nine years trying not to worryabouta massive megathrustevent shakingme,my family, and everything around us violently for several minutes.

Usually,I sleep pretty soundly in the1912 wood-frame house my family calls home.Ireassure myself with the belief the housewillremain standing during the big one.Everyone inside willbe okay, I think. We just need todrop, cover, and hold on.

Well, that's what I thought.But then I spoke to Graham Taylor.

Taylor isastructural engineer in Greater Victoria, who has workedextensively on the province's $2.5-billion school seismic program.

He thinksmaking schools safer for tens ofthousands of students is important.But he stresses the schools are only a small fractionof the vulnerable buildings in B.C., and many old houses also need fixing.

Thousands of houses could collapse

"It's my personal opinion that we have several thousand houses that are going to collapse in the southern Greater Victoria area," Taylor told me. "We could have easily 2,000 fatalities."

This is what surprised me the most.

It may sound naive, but up until now I'd thought that people would be relatively safe in their houses, if those houses are made of wood.

Timber-frame construction is generally safer in an earthquake than unreinforced brickand cinder block buildings,which are more prone to collapse when the shaking starts.

But that doesn't mean all wood houses are safe.

Taylor saidthe massive Cascadia megathrust earthquakethat will one day shake large portions of southern B.C. and the U.S. Pacific Northwest will be especially hard on older houses.

Of particular concern are the basement walls, between the concrete foundation and the main floor. Many of those walls are not strong enough to support the weight of the house above once it starts shaking. And when those weak basement walls are in houses built on unstable ground, the results could be deadly.

"If we have a significant shake, they're going to collapse because of the form of construction, the bad soils, and the high seismicity. It's a nasty, nasty combination," he said.

Taylor believes as many as 30,000 buildings on southern Vancouver Island could be heavily damaged, and be off-limits to their owners for months or even years.

He said the number of homes would be similar in Metro Vancouver. If a major seismic event were to happen now, Taylor suggests that as many as 150,000 people would not be able to go back to their homes on B.C.'s South Coast.

Earthquake will cost B.C. billions

The economic impact of a massive natural disaster in the future isdifficult to predict, but a 2013 study from the Insurance Bureau of Canadapegs the costs of a 9.0-magnitude quake off the B.C. coast at $75-billion. Others predict it would top $100-billion.

The numbers are sobering, but Taylor and a small group that includes economists and Green Party leader Elizabeth May insist much of the pain can be avoided.

This fall they will meet with Canada's Public Safety Minister, Ralph Goodale, and other cabinet ministers to urge the federalgovernment to set up a fund they would call BRIC- Building Resilience in Canada.

The idea behind BRICis relatively simple, if expensive. Building owners in B.C. and in the seismically-active Ottawa-Montreal corridor would be eligible for matching government grants for any seismic improvements done to their property.

So if strengthening the concrete foundation and old basement walls of a 100-year-old housecosts $30,000, the homeowner would pay halfand the federal and provincial governments would cover the rest.

That may make a seismic fix an affordable option for many homeowners, but the BRIC proposal would also see governments paying more than $30-billion over the next three decades.

For Graham Taylor, it would be money well spent.

"If you want to talk money, this is something that you can't afford not to do. It's the only disaster in Canada of its magnitudethat is effectively preventable."

Like many West Coast homeowners, I've already got a mountainof a mortgage to pay off, and I don't fancy the idea of owing more.

ButI'm not sure I'll sleep so soundlytonight.