Japan on 'megaquake' alert

The earthquake shook buildings in Tokyo and triggered tsunami warnings with waves of up to 10 feet expected in some prefectures.

While no serious damage has been reported yet, the seismic activity has renewed fears of a catastrophic event along the Nankai Trough.

Prime Minister Sanae Takaichi has stated that the government is on high alert and coordinating emergency responses.

Japan's history of devastating quakes has driven a national character of persistent readiness and advanced disaster preparedness.