Key Facts
• Indonesia’s Lewotobi volcano erupted on July 7, 2025, around noon (JST).
• Japan Meteorological Agency investigated potential tsunami impacts on Japan.
• Large eruptions can cause pressure waves, potentially triggering tsunamis.
• No tide level changes were observed at monitoring stations in Japan or overseas.
• At 9:30 PM (JST), the agency confirmed no tsunami impact on Japan.
• Similar eruptions in March and June 2025 also caused no tsunami in Japan.
Summary
The Japan Meteorological Agency confirmed no tsunami impact on Japan following a major eruption of Indonesia’s Lewotobi volcano on July 7, 2025. The eruption, occurring around noon (JST), prompted investigations due to the potential for pressure waves from large eruptions to generate tsunamis. However, no tide level changes were detected at monitoring stations in Japan or abroad. The agency announced its findings at 9:30 PM (JST). Previous eruptions of the same volcano in March and June 2025 similarly caused no tsunami effects in Japan.
