<Tr> <Th> Aftershocks </Th> <Td> 11,450 (as of 3 March 2015) </Td> </Tr> <Tr> <Th> Casualties </Th> <Td> 15,894 deaths, 6,156 injured, 2,546 people missing </Td> </Tr> <P> The 2011 earthquake off the Pacific coast of Tōhoku (東北 地方 太平洋 沖 地震, Tōhoku - chihō Taiheiyō Oki Jishin) was a magnitude 9.0--9.1 (M) undersea megathrust earthquake off the coast of Japan that occurred at 14: 46 JST (05: 46 UTC) on Friday 11 March 2011, with the epicentre approximately 70 kilometres (43 mi) east of the Oshika Peninsula of Tōhoku and the hypocenter at an underwater depth of approximately 29 km (18 mi). The earthquake is often referred to in Japan as the Great East Japan Earthquake (東日本 大震災, Higashi nihon daishinsai) and is also known as the 2011 Tōhoku earthquake, and the 3.11 earthquake . It was the most powerful earthquake ever recorded in Japan, and the fourth most powerful earthquake in the world since modern record - keeping began in 1900 . The earthquake triggered powerful tsunami waves that reached heights of up to 40.5 metres (133 ft) in Miyako in Tōhoku's Iwate Prefecture, and which, in the Sendai area, traveled up to 10 km (6 mi) inland . The earthquake moved Honshu (the main island of Japan) 2.4 m (8 ft) east, shifted the Earth on its axis by estimates of between 10 cm (4 in) and 25 cm (10 in), increased earth's rotational speed by 1.8 μs per day, and generated infrasound waves detected in perturbations of the low - orbiting GOCE satellite . Initially, the earthquake caused sinking of part of Honshu's Pacific coast by up to roughly a meter, but after about three years, the coast rose back and kept on rising to exceed the original height of the coast . </P> <P> The latest report from the Japanese National Police Agency report confirms 15,894 deaths, 6,156 injured, and 2,546 people missing across twenty prefectures, and a report from 2015 indicated 228,863 people were still living away from their home in either temporary housing or due to permanent relocation . A 10 February 2014 agency report listed 127,290 buildings totally collapsed, with a further 272,788 buildings "half collapsed", and another 747,989 buildings partially damaged . The earthquake and tsunami also caused extensive and severe structural damage in north - eastern Japan, including heavy damage to roads and railways as well as fires in many areas, and a dam collapse . Japanese Prime Minister Naoto Kan said, "In the 65 years after the end of World War II, this is the toughest and the most difficult crisis for Japan ." Around 4.4 million households in northeastern Japan were left without electricity and 1.5 million without water . </P>

Where did the japan earthquake and tsunami happen