Johanna sets up two different, equally likely scenarios. First, The Big One: a 9.1 mega-thrust earthquake. Then, the lesser known 7.0 magnitude crustal quake which is shallow and strikes beneath the city of Vancouver. The outcome is catastrophic.

Fault Lines presents What On Earth: “Can Earth Day be badass again?

A catastrophic earthquake hits Canada's West Coast. In Fault Lines CBC Vancouver Seismologist Johanna Wagstaffe guides you through two disastrous scenarios so you can prepare yourself, your family, and your neighbours.