Key Facts
• July 30, 1:16 PM: 20cm tsunami observed at Cape Muroto, Kochi Prefecture.
• 2:22 PM: First wave confirmed at Cape Muroto; waves may repeat.
• 12:45 PM: First wave reached Tosashimizu; 20cm tsunami observed at 1:01 PM.
• 12:49 PM: First wave reached Kochi; 10cm tsunami observed at 1:16 PM.
• 2:29 PM: 20cm tsunami observed at Cape Muroto.
• Meteorological Agency issued offshore tsunami observation at 12:54 PM.
• 8:25 AM: M8.7 earthquake struck near Russia’s Kamchatka Peninsula.
• Tsunami warnings issued for eastern Japan; advisories for western Japan, including Kochi.
• Residents urged to evacuate to higher ground until warnings are lifted.
• Avoid entering the sea or rivers; stay away from coastlines.
• Predicted tsunami arrival times: Cape Muroto (12:00 PM), Kochi (12:30 PM), Tosashimizu (12:00 PM).
Summary
On July 30, a 20cm tsunami was observed at Cape Muroto, Kochi Prefecture, following an M8.7 earthquake near Russia’s Kamchatka Peninsula. The first wave reached Cape Muroto at 2:22 PM, with repeated waves expected. Similar observations were made in Tosashimizu and Kochi earlier in the day. The Japan Meteorological Agency issued tsunami warnings for eastern Japan and advisories for western regions, urging residents to evacuate to higher ground. Authorities stress avoiding the sea, rivers, and coastlines until all warnings are lifted. Predicted tsunami arrival times and tide schedules were provided for affected areas.
