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Volcano Photos

Oshima-Oshima Volcano, Japan

 Oshima-Oshima Volcano, Japan, Volcano photo


Oshima-Oshima Volcano, Japan

Oshima-Oshima volcano is seen here from the north with Kanpo-dake, the pyroclastic cone formed following the 1741 eruption on the center horizon.

Major edifice collapse in that year produced a large horseshoe-shaped caldera open to the north, whose walls are visible at the sides of the image.

Oshima-Oshima, a small, 4-km-wide Japan Sea island 55 km west of the SW tip of Hokkaido, is the emergent summit of two coalescing stratovolcanoes, Higashi-yama, at the east end of the island, and Nishi-yama at the west end.

Oshima-Oshima, a small, 4-km-wide Japan Sea island 55 km west of the SW tip of Hokkaido, is the emergent summit of two coalescing basaltic-to-andesitic stratovolcanoes.

Higashi-yama, at the east end of the island, is cut by a 2-km-wide caldera covered on its west side by Nishi-yama volcano.

The western cone failed during an eruption in 1741, creating a large horseshoe-shaped caldera breached to the north that extends from the summit down to the sea floor at the base of the volcano and producing a mostly submarine debris avalanche that traveled 16 km.

A tsunami associated with the collapse swept the coasts of Hokkaido, western Honshu, and Korea, and caused nearly 1500 fatalities.

The 1741 eruption, the largest in historical time at Oshima-Oshima, concluded with the construction of a basaltic pyroclastic cone at the head of the breached caldera.

No eruptions have occurred since the late-18th century.

PHOTO SOURCE: Tomoyo Hayakawa (Japanese Quaternary Volcanoes database, RIODB, and Geol Surv Japan, AIST), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.


NOTE: The information regarding Volcano on this page is re-published from other sources. No claims are made regarding the accuracy of Volcano information contained here. All suggestions for corrections of any errors about Volcano photos should be addressed to the copyright owner noted below the photo.





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