- June 12, 2022
- Posted by: admin1
- Category: DPN Topics
- 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 :
- 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.