地質陰影図（南東→北西、20°）。山頂部は北岳（右上）と南岳（左下）。現在活動中なのは南岳。手前に1914-15年の大正溶岩（T）が広がり、大隅半島と陸続きになっている。その上を1946年の昭和溶岩が覆う。山頂の右下や左下から流下している溶岩（A）は1779年の安永溶岩。大正溶岩と安永溶岩は海中に流入している。

Topographic relief of Sakurajima combined with geological map (tilted by 20° from the SE to the NW). Summit craters comprise northern Kita-dake and active southern Minami-dake. Lava flows of 1914-915 (Taisho Lava Flow; T) that covered the W and the SE flank and bridge the island and the mainland, were covered by the 1946 lava flow (Showa Lava Flow). The 1779 lava flows (An-ei Lava Flow; A) erupted from lateral craters located northeast and south of the summit. An-ei and Taisho lavas both flowed into the sea.