Fumio Kishida says he will remain in Japan after experts warn of higher than usual risk along Nankai Trough.
Buildings collapse in Hualien, as multiple aftershocks reported in Taipei.
Taiwan authorities report deaths in Hualien County, including three hikers, and say more than 900 were injured.
More than a dozen strong earthquakes struck central Japan, triggering tsunami waves along Honshu’s western coast.