Magnitude 6.8 Earthquake Strikes Kumamoto, Japan — JMA Records Maximum Intensity 7

A powerful magnitude 6.8 earthquake struck near Uto in Kumamoto Prefecture, Japan, at 16:27 JST on July 28, 2026. The Japan Meteorological Agency recorded the maximum intensity of 7 on its shindo seismic scale. No tsunami warning was issued.

A magnitude 6.8 earthquake struck 5 kilometers east of Uto in Kumamoto Prefecture, Japan, at 4:27 p.m. local time (07:27 UTC) on July 28, 2026, according to the U.S. Geological Survey.

The Japan Meteorological Agency (JMA) assigned the quake the maximum rating of 7 on its shindo seismic intensity scale — the highest level in Japan's classification system, indicating violent shaking capable of causing severe structural damage. The shindo 7 rating means it is difficult to remain standing and that reinforced concrete buildings with high earthquake resistance may also sustain damage.

The quake occurred at a shallow depth of 10 kilometers, which typically amplifies ground shaking at the surface. The USGS assigned it a Modified Mercalli Intensity of VIII (severe), with a significance score of 722. Early community intensity reports registered a CDI of 6.9 out of 10.

Located in the Kumamoto region of Kyushu — the same area struck by a devastating series of earthquakes in April 2016 — the area lies near several active fault systems. No tsunami warning was issued by authorities.

Uto, a city of roughly 35,000, sits on the western coast of Kyushu, approximately 15 kilometers south of Kumamoto City. The region is known for its semiconductor manufacturing base and the iconic Kumamoto Castle.

As of initial reporting, damage assessments are ongoing. Japan's advanced earthquake early-warning system — which sends alerts to mobile phones seconds before strong shaking arrives — was activated.

This is a developing story. Full details and links are on the site.

Sources: USGS Earthquake Hazards Program, The Mainichi/Kyodo News