Can workers refuse to work in earthquake-prone buildings?

From an article on http://www.stuff.co.nz/

Unions are moving to add quake-safe workplaces to collective agreements - meaning that workers could go on strike if employers refuse to strengthen unsafe buildings.   This will definitely be an interesting development to follow. 

http://www.stuff.co.nz/dominion-post/news/7026600/High-rise-workers-trembling