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, a small town in the region. The Japan Meteorological Agency (JMA) reported the quake originated at a depth of 50 miles.

No Tsunami Warning or Immediate Damage

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

Recent Seismic Activity

This event follows closely on the heels of a more substantial 7.7 magnitude earthquake that impacted Japan just 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

The previous week’s earthquake, with its epicenter in the Pacific Ocean at a relatively shallow depth of six miles, was powerful enough to be felt in distant cities like Tokyo. Dramatic aerial footage captured the immense waves that surged along Japan’s coastlines.

Videos circulating online showed the interior of a Japanese cafe, with signs and hanging lights visibly swaying during the shaking. Another clip depicted a chandelier rapidly flashing and oscillating, illustrating the intensity of the tremors.

Japan's Seismic Vulnerability

Japan is situated in one of the world’s most seismically active zones, positioned atop four major tectonic plates along the western edge of the Pacific ‘Ring of Fire’. This results in a high frequency of earthquakes, with the nation typically experiencing around 1,500 jolts annually.

Historical Context

The devastating 2011 earthquake, registering a magnitude of 9.0, serves as a stark reminder of the catastrophic consequences that can occur. This event triggered a massive tsunami that claimed the lives of 18,500 people and led to the meltdown at the Fukushima nuclear plant.

Nankai Trough Advisory

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

The advisory, following a magnitude-7.5 tremor in December 2025, led to panic-buying and cancellations of hotel reservations. That quake generated tsunami waves reaching up to 28 inches and caused injuries to over 40 people.