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Iriomote-jima Volcano | John Seach
Ryukyu Islands, Japan
24.558 N, 124.00 E
summit elevation -200 m
Submarine volcano
Iriomote-jima is the southern most of the Ryuku Islands volcanoes, 950 km SSW of Honshu, Japan and 200 km east of Taiwan.
Iriomote-jima volcano is located 25 km NNE of Iriomote-jima Island. The volcano lies on the southern Ryukyu–Kyushu arc, which is indistinctive compared to the northern arc.
The westernmost part of the southern Ryukyu arc–trench system near Iriomote-jima Island was established after the collision between the northern Luzon arc and the Asian continent near Taiwan.
2009 Earthquakes
A magnitude 6.1 earthquake hit 117 km SE of Iriomote-jima volcano on Wednesday 5th August, 2009 at 09:17 am. Two large earthquakes (mag 6.7 and 6.4) hit 120 km SSW of the volcano on 17th August 2009.
1992 Earthquake Swarms
An earthquake swarm occurred at the Western tip of Iriomote-jima island 24-31 August 1992. a total of 24 earthquakes were measured with a maximum magnitude 5.2 at a depth of 9 km on 24th August. A second larger earthquake swarm began on 17th September a few kilometres north of the island and continued until the end of 1992. The peak occurred on 14th October when 112 earthquakes were measured. A total of 1316 earthquakes occurred from 17th September to 31st December.
1991 Earthquake Swarm
An earthquake swarm began on NW coast of Iriomote-jima Island on 23rd January 1991 and continued until 14th April. A total of 940 earthquakes were measured, mostly at a depth of 5 km.
1924 Eruption
A major submarine eruption occurred about 25 km NNE of Iriomote-jima Island on 31st October 1924.
Further Reading
Shiraki, K. and Matsumoto, Y., 1988. The pyroxene crystallization trend of a magnesian andesite from Iriomote-jima, Ryukyu Islands: a boninite analogue. The Journal of the Geological Society of Japan, 94(5), pp.387-390.
Iriomote-jima Volcano Eruptions
1924