TOKYO, April 20 – A powerful 7.5-magnitude earthquake rocked Japan’s northeastern coastline Monday, prompting officials to warn of potentially dangerous tsunami waves reaching heights of up to 10 feet along vulnerable shorelines.
According to Japan’s Meteorological Agency, the seismic event originated beneath the Pacific Ocean at a depth of approximately 6 miles. Officials indicated that the most significant wave activity was anticipated to impact the Iwate, Aomori, and Hokkaido regions.
Prime Minister Sanae Takaichi addressed the media, confirming that an emergency response team had been activated while calling on people in threatened zones to seek immediate shelter. “The government had set up an emergency task force and urged citizens in the affected areas to evacuate to safety,” Takaichi told reporters.
Television coverage from broadcaster NHK captured vessels departing Hachinohe port in Hokkaido as crews prepared for incoming waves, while emergency alerts reading “Tsunami! Evacuate!” appeared on television screens throughout the region.
Transportation networks experienced immediate disruptions, with high-speed rail operations in Aomori – situated at Honshu island’s northern edge – suspended following the tremors, according to Kyodo news reports.
The seismic activity registered as an ‘upper 5’ on Japan’s intensity measurement system, indicating ground motion severe enough to impair mobility and potentially cause structural damage to unreinforced masonry walls.
As one of the globe’s most seismically active nations, Japan experiences tremors approximately every five minutes. Positioned within the Pacific Basin’s “Ring of Fire” – a zone of volcanic activity and oceanic trenches – the country experiences roughly 20% of all worldwide earthquakes measuring magnitude 6.0 or greater.
While no active nuclear facilities currently operate in the Hokkaido and Tohoku areas, both Hokkaido Electric Power Co and Tohoku Electric Power Co maintain several decommissioned nuclear installations in these regions. Tohoku Electric reported it was assessing potential impacts on its Onagawa nuclear facility.
