How California is preparing for the next big earthquake

The scene is terrifying -- entire sections of a Mexico City office building fall away and crash to the ground. The screams of people reacting are almost worse. That moment, captured on cellphone video, shows just one of a number of buildings, from apartments to schools to governmental offices, that collapsed during the 7.1 magnitude quake that hit Mexico on September 19.
Read more: http://www.cnn.com/2017/09/30/us/california-earthquake-preparation/index.html?source=Snapzu