Most Frightening History on Instagram: "On March 11, 2011, at 2:46 p.m. local time, a powerful undersea megathrust earthquake with a magnitude estimated between 9.0 and 9.1 struck off Japan’s northeastern coast. The quake triggered a massive tsunami, with waves soaring up to 40 meters (131 feet) in height. As the towering wall of water advanced toward the shoreline, the Japanese Coast Guard ship Mizuho, positioned near Kesennuma Bay in Miyagi Prefecture, observed the approaching surge. Calmly an