A powerful 7.4-magnitude earthquake struck northern regions of Japan on April 20, 2026, prompting immediate tsunami warnings across several coastal areas.
Authorities reported that tsunami waves, reaching up to 80 centimetres, have already hit parts of Iwate Prefecture, with further waves expected.
The earthquake occurred off the Sanriku coast in the Pacific Ocean, triggering alerts in multiple regions, including Hokkaido and Aomori Prefecture.
Tsunami Waves Recorded, More Expected
According to the Japan Meteorological Agency (JMA), an 80 cm tsunami wave was recorded at Kuji port in Iwate. Earlier, waves measuring 70 cm and 40 cm were also detected in nearby coastal zones.
Authorities have warned that tsunami waves could reach heights of up to 3 metres, posing potential risks to coastal communities. Residents have been strongly advised to evacuate immediately and move to higher ground, as multiple waves may continue to arrive over time.
Emergency Response and Safety Measures
Emergency services across affected regions have been placed on high alert. Local authorities are actively assessing damage and coordinating evacuation efforts to ensure public safety.
Japan’s Prime Minister Sanae Takaichi has directed the formation of an emergency task force and urged citizens in vulnerable areas to prioritise safety by relocating to designated evacuation zones.
Broadcast visuals showed ships leaving ports and emergency alerts urging evacuation, highlighting the seriousness of the situation.
Transport Disruptions and Impact
The earthquake has also disrupted transportation services. Bullet train operations were temporarily suspended in affected regions, including parts of Aomori, as a precautionary measure.
The tremor registered an “upper 5” on Japan’s seismic intensity scale, making it strong enough to hinder movement and cause structural concerns.
Why Japan Is Prone to Earthquakes
Japan lies along the Pacific “Ring of Fire,” one of the most seismically active zones in the world. The country experiences frequent earthquakes due to tectonic plate movements beneath the Pacific Ocean.
Experts note that Japan accounts for nearly 20% of the world’s earthquakes of magnitude 6 or higher, making disaster preparedness a critical priority.
