Тонганың жанартау аралы – Тофуа

Volcanic island in Tonga

Tofua is a volcanic island in Tonga. Located in the Haʻapai island group, it is a steep sided composite cone with a summit caldera. It is part of the highly active Kermadec Tonga subduction zone and its associated volcanic arc, which extends from New Zealand north northeast to Fiji, and is formed by the subduction of the Pacific Plate under the Indo Australian Plate. It lies about above a very active seismic zone. It is connected to the nearby island of Kao by a submarine ridge. Its sides rise steeply to the rim of the caldera, which is partially filled by a volcanic crater lake with a depth of The caldera was formed by a major eruption around 1,000 years BP, which left deposits up to thick on islands over away. Tofua's pre caldera activity is recorded by a sequence of pyroclastic deposits and lavas constituting the older cone, followed on the northern part of the island by froth lavas or welded and unwelded ignimbrite. Following the caldera collapse, lavas were erupted from the northern part of the island and the caldera rim fissure zone, scoria and lavas from the caldera wall fissure zones, pyroclastics and lavas from intracaldera cones, and recent pyroclastic fall deposits on the outer cone. Eruptive products are mainly basaltic andesites and andesites, plus occasional dacite flows within the older cone. A postcaldera cone with fumarolic activity (Lofia) is in the northern part of the caldera He observed smoke rising from the island, and that "[the] brow of the Hill had been consumed by fire". He recorded the distance as He passed through the difficult Torres Strait along the way and reached Kupang on June 14. At Tofua (Bligh spelled it Tofoa), Bligh and eighteen loyalists sought refuge in a cave to augment their meager provisions. In the March 1968 issue of the National Geographic Magazine, Luis Marden claimed to have found this cave and the grave of John Norton. Both findings were later disproved by Bengt Danielsson (who had been a member of the 1947 Kon Tiki expedition) in the June 1985 issue of the Pacific Islands Monthly. Danielsson identified Bligh's cave as lying on the sheltered northwest coast, where Bligh identified it; Marden's cave lies on the exposed southeast coast. Additionally, Danielsson thought it highly unlikely that the Tofuans would have allotted any grave site to Norton, or that the grave, if allotted, would have been preserved for two centuries. In May 1943, a lifeboat containing 23 survivors from the Liberty ship SS Phoebe A. Hearst, which sank after being torpedoed by the Japanese submarine I19 on 30 April 1943, landed. The crew survived on shellfish and coconuts until spotted by a Lockheed Hudson patrol aircraft of the Royal New Zealand Air Force and were picked up the following day by the US Navy YMS 89 and taken to Tongatapu. Tofua is no longer inhabited, but it is used for agriculture, specifically for the cultivation of Kava. The few people who occasionally stay on the island for this purpose use the huts of the abandoned village of Manaka on the east coast of the island as accommodation. Other settlements on the island were Hotaʻane in the west and Hokula in the north. In the 1996 census, five people were still counted, but since 2006, the island has been considered uninhabited. In 2008–2009, the Swiss adventurer Xavier Rosset spent 10 months alone on the island. Having a camera, he turned his survivalist endeavor into a documentary called 300 Days Alone.

E. W. Gifford, recording Tongan myths and tales in the 1920s, documented this explanation for Tofua's caldera and the creation of Kao Island to the north:

Three deities from Samoa, Tuvuvata, Sisi, and Faingaa, conspired to steal Tofua. So they came and tore up the high mountain by its very roots and its place was taken by a large lake. This enraged the Tongan gods very much and one of them, Tafakula, essayed to stop the thieves. He stood on the island of Luahako and bent over so as to show his anus. It shone so brilliantly that the Samoan deities were struck with fear, thinking that the sun was rising and that their dastardly works was about to be revealed. Hence, they dropped the mountain and fled to Samoa. The mountain became the island of Kao.

The island is the largest area of undisturbed Tongan tropical moist forests in Tonga, and was designated a national park in 2001. It has been designated an Important Bird Area by BirdLife International. Birds include the Many colored fruit dove, Crimson crowned fruit dove, Blue crowned lorikeet, Polynesian wattled honeyeater, Polynesian triller, Fiji shrikebill, and Polynesian starling.