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The wall was rebuilt by 1802, but was frequently damaged by storms and smaller tsunami, and requests for its repair were often ignored by the financially-strapped Kishū Domain. [3] Hiro Village was again devastated by a tsunami from the 1854 Ansei-Nankai earthquake, which destroyed 125 houses and damaged 56 more.
The most obvious was that in tsunami-prone areas, a power station's sea wall must be adequately tall and robust. [44] At the Onagawa Nuclear Power Plant , closer to the epicenter of the 11 March 2011 earthquake and tsunami, [ 219 ] the sea wall was 14 meters (46 ft) tall and successfully withstood the tsunami, preventing serious damage and ...
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.
Many in the town said they felt the wall lulled them into a false sense of security. [6] A 500 m (1,600 ft) section of the seaside wall was swept away by the tsunami. Large amounts of concrete debris was left around Tarō and scattered in its bay. [7] 181 people were dead or missing in the tsunami, with nearly 1,700 houses damaged or destroyed. [8]
Initially derided as a waste of public funds, the floodgate protected the village and the inner cove from the worst of the tsunami waves. [11] [12] After the 2011 tsunami, the villagers gave thanks at Wamura's grave. The village's only casualty was one missing person who went to inspect his boat in the fishing port, located outside of the wall ...
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]
Though a warning of a possible tsunami of 3 m (9.8 ft) in height was issued, [40] a 60 cm (24 in) wave was reported by NHK in the port of Onahama of Iwaki, Fukushima; a 90 cm (35 in) wave hit Sōma, Fukushima; and another wave 1 m (3 ft 3 in) in height struck the Fukushima Daiichi Nuclear Power Plant site after the 6.9 shock. [41]
It was followed by another wave measuring 30 cm at 02:14. At Sendai Port, the tsunami measured 20 cm and arrived at 03:15. [35] In Ōfunato, a tsunami of 0.4 ft was detected. [3] The earthquake did not generate a large tsunami due to its deep depth, which caused little uplift of the seafloor and only generated small displacements of seawater. [36]