A 6.4 magnitude earthquake struck the northern island of Hokkaido, Japan, early this morning.

Earthquake Details

The quake occurred at 5:23 am local time (9:23 pm BST on Sunday), with the epicenter located 11 miles west of Sarabetsu. The Japan Meteorological Agency (JMA) reported the earthquake originated at a depth of 50 miles.

No Tsunami Warning or Immediate Damage

As of now, no tsunami warning has been issued, and authorities have not reported any casualties or structural damage resulting from the tremor.

Recent Seismic Activity

This event follows a more substantial 7.7 magnitude earthquake that impacted Japan last week, triggering a tsunami and prompting a nationwide advisory regarding the potential for a ‘megaquake’.

Megaquake Advisory

The JMA has clarified that today’s earthquake occurred outside the area covered by the recent megaquake advisory. The special awareness week initiated in response to last week’s event is still scheduled to conclude as planned.

Previous Earthquake Impacts

Last week’s 7.7 magnitude earthquake was felt in distant cities like Tokyo. Dramatic aerial footage showed waves surging along Japan’s coastlines, and videos circulated online depicting the intensity of the shaking inside buildings.

Japan's Seismic Vulnerability

Japan is situated in one of the world’s most seismically active zones, atop four major tectonic plates along the Pacific ‘Ring of Fire’. The country typically experiences around 1,500 jolts annually, representing approximately 18 percent of global earthquake activity.

Historical Context

The devastating 2011 earthquake, with a magnitude of 9.0, triggered a massive tsunami that claimed 18,500 lives and caused the Fukushima nuclear plant meltdown.

Nankai Trough Advisory

In 2024, the JMA issued a special advisory concerning a possible ‘megaquake’ along the Nankai Trough. Government projections estimate a major earthquake in this region could result in up to 298,000 fatalities and $2 trillion in economic damage.

A magnitude-7.5 tremor off the northern coast in December 2025 led to panic-buying and hotel cancellations, generating tsunami waves up to 28 inches and causing over 40 injuries.