Residents of Sendai had only eight to ten minutes of warning, and more than a hundred evacuation sites were washed away. The earthquake triggered powerful tsunami waves that may have reached heights of up to 40.5 meters (133 ft) in Miyako in Tōhoku's Iwate Prefecture, and which, in the Sendai area, traveled at 700 km/h (435 mph) and up to 10 km (6 mi) inland. It was the most powerful earthquake ever recorded in Japan, and the fourth most powerful earthquake recorded in the world since modern seismography began in 1900. The disaster is often referred to as simply 3.11 (read san ten ichi-ichi in Japanese). It is sometimes known in Japan as the " Great East Japan Earthquake" ( 東日本大震災, Higashi nihon daishinsai ), among other names. It lasted approximately six minutes, causing a tsunami. On 11 March 2011, at 14:46 JST (05:46 UTC), a M w 9.0–9.1 undersea megathrust earthquake occurred in the Pacific Ocean, 72 km (45 mi) east of the Oshika Peninsula of the Tōhoku region.
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