Read the latest developments in our live blog . NEW : the largest wave was about 100 feet above ambient sea level . Northwest : Tsunami advisory issued . Hawaii evacuations are ordered . The tsunami was caused by a magnitude 7.7 earthquake in western Canada .
NEW : the largest wave was about 100 feet above ambient sea level . Northwest : Tsunami advisory issued . Hawaii evacuations are ordered . The tsunami was caused by a magnitude 7.7 earthquake in western Canada .