First Tsunami Wave Hits Japan’s Coast After Massive 7.7 Earthquake; Immediate Evacuation Advisory Issued

The first visuals of tsunami waves hitting Japan's coastline have emerged after a powerful earthquake struck off the country's northeastern region.

The waves, measuring around half a meter, have already reached some coastal areas, raising concern among residents and authorities.

7.4 Magnitude Earthquake Triggers Tsunami

A strong earthquake measuring around 7.4 magnitude hit off the coast of Iwate Prefecture on Monday.

The quake caused strong shaking in nearby regions and triggered tsunami activity across a wide stretch of northeastern Japan. The earthquake occurred at a depth of about 20 kilometres and roughly 100 kilometres off the coast.

Several areas, including parts of Aomori and Miyagi, experienced noticeable tremors.

Authorities Warn of Bigger Earthquake Risk

Officials have warned that there is a possibility of a stronger earthquake in the coming days.

According to the Japan Meteorological Agency (JMA), a "subsequent quake advisory" has been issued. This means that while the chances are still low, the risk of a larger earthquake is higher than usual.

The agency said the probability of a major quake (magnitude 8 or above) has increased to around 1%, compared to the usual 0.1%.

Evacuation Alerts Across 182 Areas

Authorities have issued alerts across 182 municipalities, covering regions from Hokkaido to Chiba Prefecture.

Residents in these areas have been asked to stay alert and be ready to evacuate at any time. Officials have also urged people to review their evacuation plans, including safe routes and ways to contact family members during emergencies.

Tsunami Risk Still Present

Officials warned that even small tsunami waves can be dangerous and that more waves may follow.

If a stronger earthquake occurs, it could trigger a larger tsunami. People living near coastal areas have been asked to stay away from the sea and river mouths.

Past Alerts and Preparedness System

Japan has had a special alert system in place since 2022. Under this system, if a magnitude 7-level earthquake occurs near Iwate or Hokkaido, authorities may issue warnings about a possible stronger quake.

A similar advisory was issued in December after a 7.5 magnitude earthquake near Aomori.
The current advisory is expected to remain in effect until April 27.

The earthquake and resulting tsunami have once again highlighted Japan's vulnerability to natural disasters. While the current waves are relatively small, the warning of a possible stronger quake has kept authorities on high alert.