Key Facts
• July 15: Aerial survey conducted over Mount Shinmoedake by Japan’s Ministry of Land, Infrastructure, Transport and Tourism.
• Experts observed significant volcanic ash accumulation on the southwestern slopes in Kagoshima Prefecture.
• Rainfall on July 9-10 caused ash-laden sediment flow between Mount Shinmoedake and Mount Nakadake.
• Volcanic ash reduces water absorption, increasing surface erosion during rainfall.
• Continuous eruptions reported on July 15, with poor visibility hampering observations.
• Eruption on July 14 lasted from 3:38 PM to 10:15 PM; resumed intermittently on July 15.
• Experts warn of heightened sediment flow risks during heavy rain or typhoons.
• Urgent measures, including sediment removal from erosion control dams, are recommended.
• Citizens advised to avoid streams during rainfall due to potential hazards.
Summary
An aerial survey conducted on July 15 revealed significant volcanic ash accumulation on the southwestern slopes of Mount Shinmoedake in Kagoshima Prefecture, raising concerns about sediment flow during heavy rain. Experts noted that fine ash particles reduce water absorption, intensifying surface erosion. Rainfall earlier in the month already caused ash-laden sediment flow between Mount Shinmoedake and Mount Nakadake. Continuous eruptions were reported on July 15, following a prolonged eruption on July 14. Authorities emphasize the need for urgent measures, such as sediment removal from erosion control dams, to mitigate risks. Citizens are urged to avoid streams during rainfall as volcanic activity persists.
