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A megatsunami is a tsunami with an initial wave amplitude measured in many tens or hundreds of metres. A megatsunami is a separate class of event from an ordinary tsunami and is caused by different physical mechanisms. Normal tsunamis result from displacement of the sea floor due to movements in the Earth's crust (plate tectonics).
When the tsunami's wave peak reaches the shore, the resulting temporary rise in sea level is termed run up. Run up is measured in metres above a reference sea level. [56] A large tsunami may feature multiple waves arriving over a period of hours, with significant time between the wave crests.
Piper Alpha disaster. July 6, 1988. Oil platform explosions. October 5, 2004. ( 2004-10-05) A series of explosions and fires on the Piper Alpha, an oil platform 110 miles off the coast of Scotland that had been converted to natural gas production, results in the deaths of 167 people and the collapse of the platform.
Seconds from Disaster. Seconds from Disaster is a US/UK-produced documentary television programme that investigates historically relevant man-made and natural disasters from the 20th and early 21st centuries. Each episode aims to explain a single incident by analyzing the causes and circumstances that ultimately affected the disaster.
684 Hakuhō earthquake, Nankai earthquake. Earthquake. The first recorded tsunami in Japan struck on 29 November 684 AD off the coast of the Kii, Shikoku, and Awaji region. The earthquake, estimated at a magnitude of 8.4, [40] was followed by a large tsunami, but there are no estimates of the number of deaths. [56]
The series follows Japanese government officials, Tokyo Electric Power Company employees and Fukushima Daiichi Nuclear Power Plant employees in Okuma, Japan in the wake of the 2011 Tōhoku earthquake and tsunami. The massive waves and structural damage cause damage to the Nuclear Power Plant leading to the Fukushima nuclear disaster. The series ...
227,898 dead [5] [6] On 26 December 2004, at 07:58:53 local time ( UTC+7 ), a major earthquake with a magnitude of 9.2–9.3 Mw struck with an epicentre off the west coast of northern Sumatra, Indonesia. The undersea megathrust earthquake, known by the scientific community as the Sumatra–Andaman earthquake, [8] [9] was caused by a rupture ...
These observations included tsunami maximum readings of over 3 metres (9.8 ft) at the following locations and times on 11 March 2011, following the earthquake at 14:46 JST: [176] Peak tsunami wave height summits, color-coded with red representing most severe. 15:12 JST – off Kamaishi – 6.8 metres (22 ft)