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Indonesia Tsunami And Volcano Eruption

Indonesia Tsunami And Volcano Eruption

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GS 3 ||Disaster Management ||Major Disasters ||Volcanoes

Why in news ? :

  • On 22nd December 2018, Indonesia was hit by a Tsunami. As the giant tsunami waves crashed into coastal towns on the islands of Sumatra and Java, at 281 people were killed and 1,016 were injured.

Destruction caused by tsunami :

  • More than 220 people have been killed and 843 injured after a tsunami hit coastal towns on Indonesia’s Sunda Strait.

Causes :

  • The tsunami which struck the island on Saturday evening was caused by an undersea landslide resulting from volcanic eruption of Anak Krakatau, a volcanic island formed over years from the nearby Krakatau volcano.
  • It was exacerbated by abnormally high tide because of the current full moon situation

Volcanic Tsunami of Indonesia :

The Tsunami which Indonesia witnessed on 22nd December is attributed to the collapse in the west-southwest flank of the Anak Krakatau volcano. The collapse resulted in millions of tonnes of rocky debris plunging into the sea. This resulted in the displacement of large volumes of water resulting in Tsunami waves.

Prelims bits : About tsunami :

  • Tsunami is a Japanese word for “Harbour wave”. They are also known as seismic sea waves.
  • A tsunami can be caused by any disturbance that displaces a large water mass from its equilibrium position.
  • The usual immediate cause of a tsunami is sudden displacement in a seabed due to submarine earthquakes sufficient to cause the sudden raising or lowering of a large body of water. The tsunami on December 26, 2004 was caused after an earthquake displaced the seabed off the coast of Sumatra, Indonesia.
  • Large volcanic eruptions along shorelines, such as Krakatoa, have also produced notable tsunamis.
  • A marine volcanic eruption can generate an impulsive force that displaces the water column and gives birth to a tsunami.