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A seismogram recorded in Massachusetts, United States. The magnitude 9.1 (M w) undersea megathrust earthquake occurred on 11 March 2011 at 14:46 JST (05:46 UTC) in the north-western Pacific Ocean at a relatively shallow depth of 32 km (20 mi), [9] [56] with its epicenter approximately 72 km (45 mi) east of the Oshika Peninsula of Tōhoku, Japan, lasting approximately six minutes.
A diagram of the Dart II System A tsunami buoy Water column height on 11 March 2011 (Tōhoku earthquake and tsunami) at DART buoy 21413, 690 NM Southeast of Tokyo Plot of measurements from DART buoy 34142 showing the passage of the tsunami generated by the 2010 Chile earthquake.
Joetsu city in Niigata Prefecture observed a tsunami with a height of more than 6.6 metres (21.7 ft). Kanazawa City in Ishikawa Prefecture observed a tsunami at a height of 0.9 metres (2 ft 11 in). [216] Toyama City in Toyama Prefecture and Sakata City in Yamagata Prefecture both observed a tsunami with a height of 0.8 metres (2 ft 7.5 in). [216]
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Date/Time Thumbnail Dimensions User Comment; current: 11:44, 25 June 2013: 1,483 × 942 (121 KB): Eastwind41 {{Information |Description ={{en|1=Map of 2011 Tohoku(Sendai) earthquake observed tsunami heights in Japan.}} {{ja|1=東北地方太平洋沖地震で観測された、日本各地の津波の高さ(英語版)。
The waves bounced back to Shimabara, which, when they hit, accounted for about half of the tsunami's victims. According to estimates, 10,000 people were killed by the tsunami, and a further 5,000 were killed by the landslide. As of 2011, it was the deadliest known volcanic event in Japan. [63]
Japan had experienced 900 aftershocks after the M9.1 earthquake on March 11, 2011 with about 60 aftershocks being over magnitude 6.0 and three over magnitude 7.0. For conciseness, only earthquakes with magnitudes greater than 7.0 or an intensity greater than lower-6 on the shindo scale are listed here.
After the devastating tsunami of 2011, the Japanese government decided to protect all vulnerable villages and towns along the coast by building sea walls that range from 8.5 meters to 24 meters in height. As much as eleven billion is spent on building this 400-kilometer-long concrete wall. [16]