About Nikko
Nikko is a stratovolcano rising to -392 meters (-1,286 feet) in Japan's Northwestern Pacific Volcanic Regions. No historical eruptions have been recorded, though the volcano is classified based on geological evidence of past activity. The volcano has produced 1 recorded eruption.
Geography & Climate
Nikko is located in Japan, within the Mariana Volcanic Arc of the broader Northwestern Pacific Volcanic Regions. Situated at 23.08° N, 142.33° E in the Northern Hemisphere, the volcano lies within a tropical climate zone. With an elevation of -392 meters — below sea level — Nikko 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 composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.
Geological Context
Nikko 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 Japan near Nikko, 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. The dominant rock type is basalt / picro-basalt, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.
Eruption History Summary
Nikko has 1 recorded eruption in the geological database, spanning from 1979 CE to 1979 CE. The most recent eruption in 1979 CE places this volcano within the modern era of volcanological observation.
GVP Reference Summary
Nikko submarine volcano is a massive seamount that rises from nearly 3 km depth to within 392 m of the ocean surface near the N end of the Mariana Volcanic Arc. Two large cones at the basaltic-to-andesitic volcano have been constructed on the NW and NE rims of a roughly 3-km-wide, flat-floored submarine caldera, whose rim is prominently displayed on the southern side, but largely buried on the north. A smaller cone is present on the SE caldera floor. The larger NW cone lies within a partially buried crater and displays hydrothermal activity. Discolored water was observed in July 1979, but none has been observed during semi-regular seasonal reconnaissance flights since then. Hydrothermal venting was documented during a NOAA expedition.
— Smithsonian Institution, Global Volcanism Program
1 Recorded Eruption
| Year | VEI | Type | Area |
|---|---|---|---|
| 1979 | 0 | Uncertain Eruption | — |
Real-Time Data
USGS Alert Level
Thermal Anomalies
Frequently Asked Questions About Nikko
Is Nikko an active volcano?+
Nikko 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.
When did Nikko last erupt?+
The most recent recorded eruption of Nikko occurred in 1979 CE with a Volcanic Explosivity Index (VEI) of 0. The eruption was classified as a "Uncertain Eruption." Nikko has 1 recorded eruption in total.
How high is Nikko?+
Nikko has a summit elevation of -392 meters (-1,286 feet) above sea level. With an elevation of -392 meters (below sea level), this is a submarine or submerged volcanic feature.
What type of volcano is Nikko?+
Nikko is classified as a Stratovolcano. Stratovolcanoes (also called composite volcanoes) are steep, conical volcanoes built up by many layers of hardened lava, tephra, and volcanic ash. They are among the most common and dangerous types, known for explosive eruptions.
Where is Nikko located?+
Nikko is located in Japan, in the Northwestern Pacific Volcanic Regions. More specifically, it lies within the Mariana Volcanic Arc. Its exact coordinates are 23.078° latitude, 142.326° longitude.
Is it safe to visit Nikko?+
Nikko can generally be visited, but as with any volcano, visitors should check local conditions and any advisory notices before traveling. Japan may have specific regulations for accessing volcanic areas. Guided tours are often the safest and most informative way to experience a volcano.
