World

Japan: 7.1-magnitude earthquake hits Kumamoto, tsunami alert triggered

Herz — World Desk · 28 July 2026 at 10:24 · 30s summary · 2 min read

The essentials

A 7.1-magnitude earthquake struck the Kumamoto region in Japan on July 28, 2026, according to Le Monde. The tremor reached level 7 on the Japanese seismic intensity scale (shindo), the maximum intensity. A tsunami alert was triggered. Railway traffic was suspended across southern Japan. No anomalies were reported at nuclear power plants.

7.1-magnitude earthquake struck Kumamoto on July 28, 2026
Tremor reached maximum level 7 on Japan's shindo seismic scale
Tsunami alert triggered following the earthquake
Railway traffic suspended across southern Japan
No anomalies reported at nuclear power plants

What We Know

A 7.1-magnitude earthquake struck the Kumamoto region in Japan on July 28, 2026, according to Le Monde. A tsunami alert was immediately triggered.

The tremor reached level 7 on the Japanese seismic intensity scale, known as shindo — the maximum level of this scale. The shindo, managed by Japan's Meteorological Agency (JMA), measures the locally felt intensity from 0 (imperceptible) to 7 (maximum), not the energy released at the source.

Railway traffic was suspended across southern Japan following the earthquake.

No anomalies were reported at nuclear power plants after the tremor.

Context

Kumamoto is located on the island of Kyūshū in southern Japan, a seismically very active zone. In 2016, the region was struck by a series of earthquakes, including a main shock of magnitude 7.0 on April 16, 2016, preceded by a tremor of magnitude 6.5 on April 14, 2016.

These 2016 earthquakes also reached level 7 on the shindo scale. This level is reserved for the most devastating earthquakes; it was notably recorded during the Kobe earthquakes (1995) and Kumamoto earthquakes (2016).

Tsunami warning systems allow detection of a wave while it is still far from coasts, so populations can be warned early enough to reach safety.

What Remains Uncertain

At this point, no information is available about potential casualties or the extent of damage. The status of the tsunami alert — maintained, lifted, or waves arriving — has not yet been confirmed.

FAQ

What is Japan's seismic intensity scale (shindo)?

The shindo is a seismic intensity scale managed by Japan's Meteorological Agency (JMA). It measures the locally felt intensity, from 0 (imperceptible) to 7 (maximum), not the energy released at the source like magnitude. Sub-levels (5 weak, 5 strong, 6 weak, 6 strong) were introduced in 1996. Level 7 was notably recorded during the Kobe earthquakes (1995) and Kumamoto earthquakes (2016).

Has Kumamoto previously experienced a major earthquake?

Yes. In 2016, a series of earthquakes struck the region, including a main shock of magnitude 7.0 on April 16, preceded by a tremor of magnitude 6.5 on April 14. These earthquakes also reached the maximum level 7 on the shindo scale.

Were Japan's nuclear power plants affected?

No anomalies were reported at nuclear power plants following the July 28, 2026 earthquake.