Iriomote-jima Volcano
Updated: Aug 2, 2025 07:34 GMT -
submarine volcano
Ryukyu Islands (Japan), 24.56°N / 124°E 
Summit height: -200 m / -656 ft
Current status: normal or dormant (1 out of 5)
Iriomote-jima volcano is a shallow submarine volcano 25 km NNE of the island of the same name.
Iriomote-jima island is the southernmost in the chain of the Ryuku Islands which still belong to Japan. It is located almost 1000 km SSW of Japan's main island Honshu and only 200 km east of Taiwan.
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Iriomote-jima volcano eruptions: 1924: large explosive submarine eruption
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
| Aug 1, 08:18 am (GMT +9) | 1.0 13 km | 28 km (17 mi) to the E | Japan: Near Ishigakijima Island | Info | |
| Wednesday, July 30, 2025 GMT (1 quake) | |||||
| Jul 31, 01:25 am (GMT +9) | 1.1 16 km | 24 km (15 mi) to the S | Near Ishigakijima Island | Info | |
| Sunday, July 27, 2025 GMT (1 quake) | |||||
| Jul 28, 04:13 am (GMT +9) | 0.5 18 km | 16 km (10.2 mi) to the NE | Japan: Near Ishigakijima Island | Info | |
Background
Iriomote-jima volcano lies in an area with an estimated depth of 200-300 m. A major submarine eruption took place at this volcano on 31 October 31 1924. It was one of the largest historical eruptions in Japan. The eruption produced about 1 cubic kilometer of rhyolitic pumice, which formed large rafts on the sea, which were drifted by currents as far as Hokkaido in the north, about 2000 km distance. The largest pumice blocks exceeded 1 x 2 m in size.Significant volcanic eruptions: Iriomote-jima volcano
In the past 10,000 years, Iriomote-jima has had only one confirmed historic eruption in 1924.
The table below lists all known eruptions (date in bold face) of Iriomote-jima volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Iriomote-jima can be found on the news page of Iriomote-jima volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
Historical obs./docs. | 4? | ||||
Remark:
Our list of volcanic eruptions closely follows the database of eruptions of the Smithsonian's Global Volcanism Project (GVP), the internationally most recognized data source for volcanic eruptions, but also includes significant eruptive episodes or related volcano events. "Volcanic eruptions" are usually to be understood as sequences of individual eruptive episodes that can follow each other, or even overlap (if several vents are involved), and can last many years, decades or even longer. For example, the current activity of Stromboli volcano is understood as a single eruption that has been ongoing since 1934.
Sources: NOAA National Centers for Environmental Information (NCEI), Global Significant Volcanic Eruptions Database. doi:10.7289/V5TD9V7K | Global Volcanism Project / Smithsonian Institution
Iriomote-jima Volcano FAQ
+When was the last eruption of Iriomote-jima volcano?
The last confirmed eruption of Iriomote-jima occurred in 1924.
+How often does Iriomote-jima volcano erupt?
Since 1924, Iriomote-jima volcano has had at least 1 historically documented eruptions. This means that it erupts on average every 101 years.
+How active is Iriomote-jima volcano at present?
Iriomote-jima volcano is occasionally active: Since 1900, it has had one eruption, which occurred in 1924.
+When was the largest eruption of Iriomote-jima volcano?
The largest eruption of Iriomote-jima volcano in historic times occurred in 1924. It ranks as a sub-plinian eruption with a magnitude 4 on the VEI (Volcanic Explosivity Index) scale.
Latest satellite images
Iriomote-jima Volcano Maps
Below is a selection of maps showing the location and surroundings of the volcano at various resolutions based on aerial-imagery / terrain maps. Feel free to use them for non-commercial purposes on your blog or website as long as you credit them with a link back to this page (click to copy it).
Satellite/aerial-type map of Iriomote-jima volcano (world scale)
Terrain-type map of Iriomote-jima volcano (world scale)
Satellite/aerial-type map of Iriomote-jima volcano (region scale large)
Terrain-type map of Iriomote-jima volcano (region scale large)
Satellite/aerial-type map of Iriomote-jima volcano (region scale medium)
Terrain-type map of Iriomote-jima volcano (region scale medium)
Satellite/aerial-type map of Iriomote-jima volcano (region scale small)
Terrain-type map of Iriomote-jima volcano (region scale small)
Satellite/aerial-type map of Iriomote-jima volcano (local scale large)
Terrain-type map of Iriomote-jima volcano (local scale large)
Satellite/aerial-type map of Iriomote-jima volcano (local scale medium)
Terrain-type map of Iriomote-jima volcano (local scale medium)
Satellite/aerial-type map of Iriomote-jima volcano (local scale small)
Terrain-type map of Iriomote-jima volcano (local scale small)
Satellite/aerial-type map of Iriomote-jima volcano (scale of 10s of km)
Terrain-type map of Iriomote-jima volcano (scale of 10s of km)
Satellite/aerial-type map of Iriomote-jima volcano (scale of 20-40 km)
Terrain-type map of Iriomote-jima volcano (scale of 20-40 km)
Satellite/aerial-type map of Iriomote-jima volcano (scale of approx. 10-20 km)
Terrain-type map of Iriomote-jima volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Iriomote-jima volcano (scale of 5-10 km)
Satellite/aerial-type map of Iriomote-jima volcano (scale of few kilometers)
