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Tonga eruption

  • June 12, 2022
  • Posted by: OptimizeIAS Team
  • Category: DPN Topics
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Tonga eruption

Subject: Geography

Section: Geomorphology

Context:

  • Researchers are starting to piece together why the Hunga Tonga–HungaHa’apai eruption in the South Pacific on January 15 was so explosive.
  • Evidence gathered by two groups suggests that when the Tongan volcano’s centre collapsed, it spewed an enormous amount of magma that reacted violently with water.
  • Concept :

Tonga

  • Located in Oceania, Tonga is a small archipelago in the South Pacific Ocean, directly south of Samoa and about two-thirds of the way from Hawaii to New Zealand.
  • It has 169 islands, 36 of them inhabited, which are in three main groups – Vavaʻu, Haʻapai, and Tongatapu – and cover an 800-kilometer (500-mile)-long north–south line.
  • The total size is just 747 km2 (288 sq mi). Due to the spread out islands it has the 40th largest Exclusive Economic Zone of 659,558 km2 (254,657 sq mi).
  • Geologically the Tongan islands are of two types: most have a limestone base formed from uplifted coral formations; others consist of limestone overlaying a volcanic base.
  • Tongan Volcanic Arc was created from the subduction of the westwards-moving Pacific plate under the Australia-India plate at the Tonga Trench.
  • The eastern islands are not volcanic and sit above the mostly submerged Tonga ridge that runs parallel to the Tongan Volcanic Arc and the Tongan Trench.
  • In regards to volcanism, Tonga has moderate volcanic activity.
  • Fonualei has shown frequent activity in recent years, while Niuafo’ou which last erupted in 1985, has forced evacuations; other historically active volcanoes include Late and Tofua.
Geography Tonga eruption

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