What's the big deal with the Cascadia Subduction Zone? 

Cascadia earthquakes are expected every 300-500 years. The last 9.0 quake hit the Pacific Northwest more than 300 years ago.
Subscribe to KOIN 6's RU-vid channel: www.youtube.co...
Go to KOIN.com for the latest headlines: www.koin.com/
Follow us on Twitter: / koinnews
Follow us on Facebook: / koin6
Follow us on Instagram: / koin6