Homeaftershock Northwest earthquake projected to be 8.7 and 9.2 byThe Great Pacific Northwest Earthquake -September 12, 2015 Thirty years ago, no one knew that the Cascadia subduction zone had ever produced a major earthquake. Forty-five years ago, no one even knew it existed. Read more FULL ARTICLE Tags aftershock aftershocks cascadia subduction zone earthquake preparedness earthquake safety guide earthquakes Pacific Northwest Seismic Network seattle earthquake Facebook Twitter Share:Northwest earthquake projected to be 8.7 and 9.2 Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email