Volcanoes of Izu Islands (21)

Aoga-shima | Bayonnaise Rocks | Doyo | Hachijo-jima | Inamba-jima | Kozu-shima | Kurose Hole | Mikura Seamount | Mikura-jima | Miyake-shima | Mokuyo | Myojin Knoll | Nii-jima | Onoharajima | Oshima | Smith Rock | Sofugan | Suiyo | To-shima | Tori-shima | Udonejima

Volcano list

Aoga-shima

(stratovolcano 423 m / 1,388 ft)
Aoga-shima volcano (青ヶ島, Aogashima) is a stratovolcano forming a beautiful small 2.5 x 3.5 km island with steep cliffs in the Izu island chain, 300 km south of Tokyo.
The dominantly basaltic Aoga-shima volcano contains a complex caldera (Ikenosawa Crater) with a diameter of... [more]

Bayonnaise Rocks

(submarine volcano 11 m / 36 ft)
Steam pours from the blocky summit of a lava dome formed at Myojin-sho during a submarine eruption at the Bayonnaise Rocks volcano in 1952. This September 22 photo was taken 6 days after the dome began to breach the sea surface. Later that day the eruption became highly explosive, and the dome was destroyed. Three cycles of dome growth and destruction occurred until October 1953. Myojin-sho is located on the eastern rim of a 7-9 km wide submarine caldera. (Photo: Helen Foster / USGS)
Steam pours from the blocky summit of a lava dome formed at Myojin-sho during a submarine eruption at the Bayonnaise Rocks volcano in 1952. This September 22 photo was taken 6 days after the dome began to breach the sea surface. Later that day the eruption became highly explosive, and the dome was destroyed. Three cycles of dome growth and destruction occurred until October 1953. Myojin-sho is located on the eastern rim of a 7-9 km wide submarine caldera. (Photo: Helen Foster / USGS)
Bayonnaise Rocks volcano (ベヨネース列岩 Beyonēsu-retsugan) is an active submarine volcano in the Izu Islands ca. 400 km south of Tokyo. The volcano has a large 8-9 km wide caldera whose highest point forms a few rocks rising just above sea level. The volcano is known for its submarine ... [more]

Doyo

(submarine volcano -860 m / -2,821 ft)
Doyo Seamount is the southernmost of the 7 Shichiyo Seamounts, named for the 7 days of the week. Doyo ("Saturday") is a basaltic-andesite submarine caldera that rises 2340 m from the sea floor to within 860 m of the sea surface.
It has a large horseshoe-shaped 3 x 10 km wi... [more]

Hachijo-jima

(stratovolcanoes 854 m / 2,802 ft)
Hachijo-jima volcano (八丈島, Hachijōjima) forms an 14 km NW-SE elongated island in the central Izu Islands about 300 km south of Tokyo. It consists of 2 small overlapping, mainly basaltic stratovolcanoes (Higashi-yama and Nishi-yama).
The last eruptions were from the younger ... [more]

Inamba-jima

(Lava dome 74 m / 243 ft)
[more]

Kozu-shima

(lava domes 572 m / 1,877 ft)
Kozu-shima volcano (神津島, Kōzushima) forms a small 6 x 4 km island consisting of 18 lava domes. The last eruption was in the 9th century AD. [more]

Kurose Hole

(submarine volcano -107 m / - 351 ft)
Kuruse Hole is a submarine circular caldera located between Mikurajima and Hachijojima in the Izu Islands chain. The caldera is 600-760 deep and 5–7 km wide. A flat-topped rim of a probable somma (pre-caldera cone) rises to within 107 m of the sea surface.
Large amounts of... [more]

Mikura Seamount

(Submarine -321 m / -1053 ft)
[more]

Mikura-jima

(stratovolcano 851 m / 2,792 ft)
Mikura-jima volcano (御蔵島, Mikurajima) forms a small steep-sided island between Miyake-jima and Hachijo-jima volcanoes in the Izu Islands of Japan. The sparsely populated island is surrounded by 500 m high cliffs on the S and E side.
Mikura-jima volcano contains of a strato... [more]

Miyake-shima

(stratovolcano 815 m / 2,674 ft)
Miyake-jima (三宅島 Miyakejima) is an active stratovolcano in the northern Izu Islands, about 200 km south of Tokyo. It forms a 8 km diameter circular island and is one of the most frequently active volcanoes in the island chain. It typically erupts every 10-30 years. The last serie... [more]

Mokuyo

(submarine volcano -920 m / -3,018 ft)
Mokuyo volcano is an active seamount belonging to the 7 Shichiyo Seamounts, named for the 7 days of the week. Mokuyo ("Thursday") contains a basaltic-andesite submarine caldera that rises 1780 m from the sea floor to within 920 m of the sea surface. The summit caldera is 3 x 2.3 ... [more]

Myojin Knoll

(submarine volcano -360 m / -1,181 ft)
Myojin Knoll volcano is a large submarine caldera between Aoga-shima and Bayonnaise Rocks volcanoes in the Izu-Bonin arc. The volcano contains a 6-7 km wide and up to 900 m deep caldera with steep walls.
The highest point on the western caldera rim is a pumice-mantled remna... [more]

Nii-jima

(lava domes 432 m / 1,417 ft)
Nii-jima volcano (新島 Niijima) is a group of 8 rhyolitic lava domes located on the northern and on the southern end of the elongated 11 x 2.5 km island of Niijima. The last eruptions occurred in the 9th century, and there were earthquake swarms beneath the volcano in the 20th cent... [more]

Onoharajima

(Lava dome 114 m / 374 ft)
[more]

Oshima

(stratovolcano 764 m / 2,507 ft)
Oshima volcano (伊豆大島 Izu-ōshima) is the northernmost of the Izu islands of Japan, and one of the world's most active volcanoes. It is a mostly submerged stratovolcano that forms an 11 x 13 km island.
Oshima erupts very frequently, on average every 1-3 years, but has been q... [more]

Smith Rock

(submarine volcano 136 m / 446 ft)
Smith Rock volcano (also known as Sumisu-jima, or Smith Island) is a steep, 136 m high pinnacle rising vertically above the sea surface. It is part of the southern rim of a 9 km wide submarine caldera belonging to a larger seamount.
Numerous submarine eruptions have occurr... [more]

Sofugan

(stratovolcano 99 m / 325 ft)
Sofugan is a steep vertical pinnacle that rises 99 m above the sea surface south of Tori-shima volcano. Its dramatic shape gave it its nickname "Lot's Wife Rocks."
In 1975, discolored sea water was observed about 500 m north of Sofugan, and the volcano was reclassified as a... [more]

Suiyo

(submarine volcano -1418 m / -4,652 ft)
Suiyo is an active submarine volcano forming one of the Shichiyo Seamounts, which are named for the 7 days of the week and are located south of Sofugan volcano. Suiyo ("Wednesday") is an basaltic-to-dacitic submarine volcano with a caldera and lava dome that rises about 1400 m fr... [more]

To-shima

(stratovolcano 508 m / 1,667 ft)
To-shima volcano (利島, Toshima) in the northern Izu Island chain is a stratovolcano forming a small 2 x 2.4 km island south of Oshima volcano. [more]

Tori-shima

(stratovolcano 394 m / 1,293 ft)
Tori-shima (鳥島 Torishima or Izu-no-Torishima) is a stratovolcano forming a small 2.7 km wide circular island in the southern Izu volcanic chain. Historical eruptions have occurred from summit and flank vents near the north coast as well as from submarine vents.
Several othe... [more]

Udonejima

(Stratovolcano 209 m / 686 ft)
[more]
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