Why in news?
Japan’s Sakurajima volcano, located on Kyushu Island, erupted repeatedly on 16 November 2025, sending ash plumes up to 4.4 km into the sky. The Japan Meteorological Agency recorded three significant eruptions overnight, prompting flight cancellations and issuing warnings to residents in Kagoshima and neighbouring Miyazaki Prefecture about ash fall.
Background
Sakurajima is a stratovolcano situated within the Aira Caldera near the city of Kagoshima. Once an island, it became connected to the mainland during a massive eruption in 1914 when lava filled the strait. Historical records show eruptions dating back to AD 708. Since 1955 the volcano has been in an almost continuous state of activity, making it one of the world’s most closely monitored volcanoes.
Characteristics and hazards
- Volcano type: Stratovolcano built from layers of lava, ash and volcanic rock. Its main peak, Kitadake, rises to about 1,117 m.
- Eruption style: Predominantly Strombolian eruptions that eject ash and incandescent rocks. Major eruptions in 1471–1476, 1779–1781 and 1914 produced pyroclastic flows, lava flows and tsunamis.
- 2019 and 2025 events: Ash plumes reached 5.5 km in 2019, while the latest eruption sent ash to 4.4 km. Volcanic ash can disrupt aviation, damage crops and pose respiratory hazards.
- Monitoring and preparedness: The Japan Meteorological Agency operates seismometers, gas sensors and cameras around Sakurajima. Residents are trained in evacuation procedures, and shelters are maintained to protect against pyroclastic flows and falling ash.
Conclusion
Sakurajima’s persistent activity reminds us of Japan’s geologic volatility. While most eruptions are moderate, preparedness and monitoring are essential to protect people, infrastructure and air traffic. The November 2025 eruption served as another test of the region’s robust disaster‑management system.