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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). [217] 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). [217]
As it approaches land, the wave height of an ordinary tsunami increases dramatically as the sea floor slopes upward and the base of the wave pushes the water column above it upwards. Ordinary tsunamis, even those associated with the most powerful strike-slip earthquakes, typically do not reach heights in excess of 30 m (100 ft). [3] [4]
Download as PDF; Printable version; ... [12] [13] The oldest human record of a tsunami dates back to 479 BC, ... or Tsunami Height: Refers to the height of a tsunami ...
At Sado Island, over 350 kilometres (217 mi; 189 nmi) away, a wave height of 2 to 5 metres (6 ft 7 in to 16 ft 5 in) has been estimated based on descriptions of the damage, while oral records suggest a height of 8 metres (26 ft). Wave heights have been estimated at 3 to 4 metres (9.8 to 13.1 ft) even as far away as the Korean Peninsula. [9]
The yellow numbers give the height of the tsunami wave as indicated by tsunamites studied by researchers. [1]Storegga (Norwegian: Great Edge) is located at the edge of Norway's continental shelf in the Norwegian Sea, 100 km (62 mi) north-west of the Møre coast.
At Tosashimizu, Kōchi, the tsunami was 0.9 m (2 ft 11 in) in height. [112] [113] A tsunami measuring 0.9 m (2 ft 11 in) was also reported in Chichijima Futami. [114] On the Tohoku coast, a 0.7 m (2 ft 4 in) wave struck at 00:38 local time, on 16 January 2022. In the Sendai Port, the tsunami measured 0.9 m (2 ft 11 in) at 00:08. [115]
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.
Based on the effects of a tsunami that hit Japan, a tsunami 20 m (66 ft) probably hit the Chilean coast in AD 1420, which swept boulders inland as if they were pebbles. [5] The 1420 Caldera earthquake generated tsunamis reaching Japan. [6] In the sea off of the Atacama near Caldera, on April 11, 1819, there was a magnitude 8.5 earthquake.