About Niuatahi
Niuatahi is a caldera rising to -1,270 meters (-4,167 feet) in Tonga's Tonga-Kermadec Volcanic Regions. No historical eruptions have been recorded, though the volcano is classified based on geological evidence of past activity.
Geography & Climate
Niuatahi is located in Tonga, within the Northeast Lau Basin Volcano Group of the broader Tonga-Kermadec Volcanic Regions. Situated at 15.37° S, 174.00° W in the Southern Hemisphere, the volcano lies within a tropical climate zone. With an elevation of -1,270 meters — below sea level — Niuatahi is a submarine or submerged volcanic feature. Submarine volcanoes make up the majority of Earth's volcanic activity, though most eruptions go unobserved beneath the ocean surface. The volcanic landform is characterized as a caldera, which describes the physical shape and structure of the volcanic edifice as observed from the surface.
Geological Context
Niuatahi sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Tonga near Niuatahi, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit.
GVP Reference Summary
Niuatahi is a nearly circular caldera ~15 km in diameter, with a floor at a depth of about 2 km (Arculus, 2012). A young cone (Motu Tahi) in the SE sector rises 730 m above the floor to a summit depth of about 1,270 m. The volcano is in the Northeast Lau Basin, ~40 km W of the edifices along the Tofua Volcanic Arc, and 25 km E of the central ridge of the Northeast Lau Spreading Center. The composition of the cone and surrounding floor is predominantly dacite. Towing with seafloor cameras over the cone and various parts of the caldera in 2012 resulted in the discovery of at least three sources of hydrothermal particle venting on the cone's summit and adjacent to the inner caldera walls. The Tonga Ministry of Lands, Environment, Climate Change and Natural Resources named the volcano Niuatahi, which means 'sea' in Tongan, with the small cone of Motutahi meaning 'island in the sea'; it had previously been given an unofficial research cruise designation of "Volcano O."
— Smithsonian Institution, Global Volcanism Program
0 Recorded Eruptions
No eruption records available for Niuatahi.
Real-Time Data
USGS Alert Level
Thermal Anomalies
Frequently Asked Questions About Niuatahi
Is Niuatahi an active volcano?+
Niuatahi is not currently classified as active. Its activity evidence is listed as "Unrest / Holocene." No recorded eruptions have been documented. However, no volcano is ever considered permanently extinct.
How high is Niuatahi?+
Niuatahi has a summit elevation of -1,270 meters (-4,167 feet) above sea level. With an elevation of -1,270 meters (below sea level), this is a submarine or submerged volcanic feature.
What type of volcano is Niuatahi?+
Niuatahi is classified as a Caldera. Calderas are large volcanic depressions formed when a volcano erupts so powerfully that its magma chamber collapses, creating a basin that can be kilometers wide. They are often sites of some of Earth's largest eruptions.
Where is Niuatahi located?+
Niuatahi is located in Tonga, in the Tonga-Kermadec Volcanic Regions. More specifically, it lies within the Northeast Lau Basin Volcano Group. Its exact coordinates are -15.367° latitude, -174.003° longitude.
Is it safe to visit Niuatahi?+
Niuatahi can generally be visited, but as with any volcano, visitors should check local conditions and any advisory notices before traveling. Tonga may have specific regulations for accessing volcanic areas. Guided tours are often the safest and most informative way to experience a volcano.
