Volcanic activity reported from submarine vents on Fonualei Island on 2 September is normal activity and there is no alarm or threat, says Tonga Geological Services, after discolouration of the sea on the coast of the island, situated 75km NNW of Vava’u, was reported by marine biologists mapping the area last week.

The discoloration was reported to TGS by marine biologist Karen Stone and a research team, who were mapping the marine life and reefs in this area.

She said the discoloured area was associated with eggy odour, indicative of sulphur deposits. The Vava'u Environmental Protection Association (VEPA) provided pictures taken by a drone flown over the area.

Continuous venting

“There is no alarm and threat. This is normal volcanic activity at Fonualei. The plume is released from submarine vents along the northwest coast of the island. This has been a continuous activity historically,” stated Tonga Geological Services.

At the same time, on 6 September, volcano observation over Tonga waters using the Satellite HIMAWARI-8 AHI Ash Detection Equipment, showed no volcanic ash emitted from Tonga's active volcanoes.

"All volcanoes are at their normal state or activity."

Chief Geologist Taaniela Kula, and Director of Tonga’s Meteorological Service, 'Ofa Fa’anunu have elaborated on the current Fonualei situation on radio and television to address any concerns.