Sakurajima Volcano erupts in Japan’s Kyushu

Why in the News?

Japan’s Sakurajima volcano has erupted several times sending ash plumes up to 4.4 km into the atmosphere.

About Sakurajima Volcano:

• Location: Kagoshima Prefecture, Kyushu, sitting on the southern rim of the Aira caldera inside Kagoshima Bay.
• Geological Origin: Linked to formation of the Aira caldera (22,000–29,000 years ago); Sakurajima developed as a post-caldera cone about 13,000 years ago.
• Volcano Type: A classic stratovolcano built from alternating lava and ash layers; active vents include Minamidake crater and the Showa flank crater.
• Physical Features: Height 1,117 m, circumference ≈50 km; originally an island until 1914 lava flows connected it to the Osumi Peninsula.
• Eruption Style: Dominantly Strombolian eruptions (ash, bombs, lapilli) but historically capable of large Plinian eruptions.
• Historical Activity: Continuous eruptive record since 963 AD; major episodes in 1471–76, 1779–82, and the 1914 catastrophic eruption.
• Risk Status: Considered one of Japan’s most dangerous volcanoes due to high activity, caldera-linked magma supply and extreme proximity to inhabited zones.

What makes it unique?

• Near-Continuous Activity: Erupts hundreds of times annually, ranking among the world’s most persistently active volcanoes.
• Caldera System: Built on the Aira caldera, giving it a deep, complex, highly active magma plumbing network.
• Landform Transformation: The 1914 eruption converted Sakurajima from an island into a peninsula, an unusual event in recorded volcanology.