Stratified phreatomagmatic deposits are exposed along a cliff on the eastern coast of Niijima, with the flat-topped Miyazukayama lava dome in the background. The 11-km-long island is comprised of eight rhyolite lava domes clustered in two groups. The Mukaiyama complex at the southern end of the island and Achiyama lava dome at the northern end formed during the 9th century CE.

Photo by Ichio Moriya (Kanazawa University).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Keywords: stratigraphy | outcrop | tephra | geology | deposit | lava dome

Niijima