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A megatsunami is a tsunami with an initial wave amplitude measured in many tens or hundreds of metres.The term "megatsunami" has been defined by media and has no precise definition, although it is commonly taken to refer to tsunamis over 100 metres (330 ft) high. [2]
The Sanriku region was hit by a large tsunami on 13 July 869 AD, causing floods to spread 4 km (2.5 mi) inland from the coast. Tagajō was destroyed, with an estimated 1,000 casualties. 887 CE: Nankai, Japan: 887 Ninna Nankai earthquake: Earthquake: On 26 August 887 AD, there was a strong commotion in the Kyoto region, causing great destruction ...
Smaller (M w 4.2) earthquakes in Japan can trigger tsunamis (called local and regional tsunamis) that can devastate stretches of coastline, but can do so in only a few minutes at a time. Landslides The Tauredunum event was a large tsunami on Lake Geneva in 563 CE, caused by sedimentary deposits destabilised by a landslide.
The 2004 Indian Ocean tsunami was a teletsunami.. A teletsunami (also called an ocean-wide tsunami, distant tsunami, distant-source tsunami, far-field tsunami, or trans-ocean tsunami) is a tsunami that originates from a distant source, defined as more than 1,000 km (620 mi) away or three hours' travel from the area of interest, [1] [2] sometimes travelling across an ocean.
However, when they are amplified by resonance they can be hazardous. [2] Meteotsunami events can last anywhere from a few minutes to a couple of hours. Their size, length and period is heavily dependent on the speed and severity of the storm front. They are progressive waves which can affect enclosed basins and also large areas of coastline.
A nuclear disaster occurred there after a 9.0 magnitude earthquake and subsequent tsunami on 11 March 2011. The earthquake triggered a scram shut down of the three active reactors, and the ensuing tsunami crippled the site, stopped the backup diesel generators, and caused a station blackout.
UTC time: 2010-10-25 14:42:22: ISC event: 15264887: USGS-ANSSComCat: Local date: 25 October 2010 (): Local time: 21:42:22: Magnitude: 7.8 M w: Depth: 12.8 miles (20.6 km) Epicenter: 1] [2]: Fault: Sunda megathrust: Type: Thrust fault: Areas affected: Indonesia: Max. intensity: MMI V (Moderate) [1]: Casualties: 408 dead + 303 missing [3]: The 2010 Mentawai earthquake occurred with a moment ...
A volcanic tsunami, also called a volcanogenic tsunami, is a tsunami produced by volcanic phenomena. About 20–25% of all fatalities at volcanoes during the last 250 years have been caused by volcanic tsunamis.