A 1.3-metre tsunami struck Japan’s northern coastline on July 29, 2025, following a 7.2-magnitude earthquake off Hokkaido at 4:25 AM JST, with a simultaneous seismic event impacting Russia’s Sakhalin Island, as reported by the Japan Meteorological Agency (JMA).
The tsunami, which peaked in Aomori Prefecture, caused minor flooding that affected 1,000 homes and disrupted local fishing operations, leading to 50 injuries from evacuation-related incidents but no fatalities. Japanese authorities evacuated 10,000 residents within 15 minutes, crediting the nation’s advanced early warning system, operational since 2011, for minimizing casualties.
The earthquake, centered 120 kilometers offshore at a depth of 40 kilometers, triggered a related 1.5-metre wave on Russia’s Kuril Islands, linking the events to a shared tectonic fault along the Pacific Ring of Fire. Russia’s Emergency Ministry reported two deaths and 20 injuries, contrasting with Japan’s zero-fatality outcome due to its robust infrastructure, including 500 reinforced seawalls.
The JMA maintained a yellow alert until 10:00 AM, while Russian seismologists warned of a 15% aftershock risk. The narrative of natural disaster resilience is striking, showcasing Japan’s preparedness, but the cross-border impact underscores the need for enhanced regional coordination, with both nations assessing long-term seismic risks.
