Key Facts
• Tsunami alert issued for Oita Prefecture on July 30, 2025.
• Saiki City opened temporary shelters; up to 10 people evacuated.
• First wave expected at 12:30 PM, reaching 1 meter in height.
• Tanoura Beach in Oita City closed; swimming prohibited.
• Lifeguards evacuated 10 swimmers and restricted beach access.
• Tsunami waves of 10 cm observed in Saiki at 1:38 PM and Beppu at 2:27 PM.
• Oita River estuary showed seawater discoloration, likely due to tsunami mixing.
• Meteorological agency confirmed seawater changes caused by tsunami activity.
Summary
On July 30, 2025, a tsunami alert created a tense day in Oita Prefecture, Japan. Saiki City opened temporary shelters, hosting up to 10 evacuees, including families with children and elderly individuals. Tanoura Beach in Oita City was closed, and swimming was prohibited after lifeguards evacuated 10 swimmers and restricted access. The first wave, predicted to reach 1 meter, arrived at 12:30 PM, with smaller waves of 10 cm recorded in Saiki and Beppu later in the afternoon. Additionally, seawater discoloration was observed near the Oita River estuary, attributed to tsunami-induced mixing. Authorities continue to monitor the situation, with beach activities resuming only after safety is confirmed.
