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        Boris Johnson urges G7 leaders to back ‘SURGE’ strategy to help Ukraine beat Putin

        Boris Johnson urges G7 leaders to back ‘SURGE’ strategy to help Ukraine beat Putin

        Boris Johnson vows to ‘get on with the job’ after Tories suffer double by-election defeat

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          What causes earthquakes and what have been the most powerful tremors?

          by Anderson
          in Tech
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          EARTHQUAKES are known to be one of the world’s most terrifying and destructive natural disasters.

          But how do earthquakes occur, and when have been the strongest ones recorded?

          What causes earthquakes and what have been the most powerful tremors?
          Getty

          Earthquakes are caused by plate movements in the earth’s crust[/caption]

          What causes earthquakes?

          The earth’s crust is made up of different pieces known as tectonic plates.

          These plates fit together like a jigsaw and continuously move at a rate of a few centimetres a year, in different directions and at different speeds.

          It’s common for plates to slides past each other, bump into each other and move away from each other.

          As plates carry on moving in different directions over long periods of time, friction causes energy to build up.

          Eventually it becomes so great that the energy is released, which creates a shock wave – an earthquake.

          If the earthquake is beneath the ocean it can create a series of huge waves, called a tsunami.

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          Earthquakes occur around the world everyday with some so small, they can only be detected using specialist equipment.

          Others can be powerful enough to damage and destroy towns and cities.

          The size of such earthquakes would be measured on the Richter magnitude scale.

          There are earthquakes in the UK, but they are rare and so small that most people do not feel them.

          What have been the strongest ever earthquakes?

          5. Kamchatka, Russia Earthquake (1952)

          On November 4, 1952, at 16:58 GMT (04:58 local time) a huge earthquake struck off the coast of Kamchatka Peninsula, in the far east of Russia.

          Measuring 9.0 on the Richter scale, it produced a great destructive Pacific-wide tsunami with waves up to 15 meters – causing extensive damage to the Kamchatka Peninsula and the Kuril Islands.

          The earthquake approximately left 10,000-15,000 people dead.

          4. Tōhoku Earthquake (2011)

          On March 11, 2011, at 14:46 GMT (05:46 local time), a massive undersea earthquake off the coast of Japan occurred.

          The 9.1 earthquake triggered a tsunami – producing waves up to 40.5 meters high.

          The waves traveled inland as far as 6 miles and caused extensive and severe structural damage in north-eastern Japan. 

          On March 10, 2015, it was announced that the confirmed casualties were 15,894 deaths, 6,152 injured, and 2,562 people missing.

          3. Sumatra Earthquake (2004)

          What causes earthquakes and what have been the most powerful tremors?
          Getty

          Elephants pull debris January 6, 2005 to clear an area destroyed by the tsunami in Indonesia[/caption]

          On Boxing Day 2004, one of the deadliest natural disasters in recent history occurred.

          The 2004 Sumatra Earthquake, also known as the 2004 Indian Ocean earthquake, ruptured off the west coast of Sumatra, Indonesia.

          It created the greatest fault length of any recorded earthquake – spanning a distance of 1500km, had the longest duration of faulting ever observed – between 8.3 and 10 minutes, and produced a tsunami with waves 30m high.

          It caused the entire planet to vibrate as much as 1cm and caused up to a quarter of a million deaths.

          2. Great Alaska Earthquake (1964)

          What causes earthquakes and what have been the most powerful tremors?
          The Great Alaska earthquake was the most powerful recorded earthquake in US history

          The 1964 Great Alaska earthquake, also known as Good Friday earthquake, occurred at 17:36 local time (01:36 GMT the following day) on Good Friday, March 27 in the Prince William Sound region of Alaska.

          It lasted approximately 4.5 minutes and is the most powerful recorded earthquake in US history.

          The 9.2 earthquake triggered tsunamis felt in Alaska, Oregon and California.

          A total of 139 people are believed to have died – 15 as a result of the earthquake itself.

          1. Valdivia Earthquake (1960)

          What causes earthquakes and what have been the most powerful tremors?
          Getty

          The earthquake in Chile in 1960 was the most powerful earthquake ever recorded[/caption]

          Also known as the Great Chilean earthquake, it was the most powerful earthquake ever recorded measuring 9.5 on the Richter scale.

          The earthquake hit on May 22, at 19:11 GMT (15:11 local time), approximately 100 miles off the coast of Chile – parallel to the city of Valdivia. 

          It lasted approximately 10 minutes and triggered a massive tsunami with waves up to 25m.

          The total number of fatalities from the earthquake and subsequent tsunamis have been estimated between 1,000 – 6,000, with about 3,000 people injured.



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