July 28, 2026 Earthquake: Kumamoto, Japan

Reference #13456:

Tectonic Summary

The July 28, 2026 M 6.8 earthquake south of Kumamoto, on the island of Kyushu in southwest Japan, occurred as the result of shallow strike‑slip faulting. Focal mechanisms indicate that the slip took place either on a left‑lateral fault striking northwest or on a right‑lateral fault striking northeast. Although the earthquake occurred several hundred kilometers northwest of the Ryukyu Trench, where the Philippine Sea plate begins its northwestward subduction beneath Japan and the Eurasia plate, the shallow depth and faulting style indicate that this event occurred on a crustal fault within the upper Eurasia plate. At this location, the Philippine Sea plate converges with the Eurasia plate toward the northwest at a rate of 58 mm per year.

Most seismicity in the Kyushu region is associated with the deep subduction of the Philippine Sea plate. However, a deadly earthquake sequence struck this region in April 2016. That sequence included two foreshocks, M 6.2 and M 6.0, followed one day later by a M 7.0 mainshock. The foreshocks to the April 2016 M 7.0 event caused at least nine fatalities and injured more than 800 people, while the M 7.0 mainshock killed at least 40 people and injured over 2,000. Approximately 12,000 houses were damaged or destroyed by the 2016 M7.0 earthquake, and the Aso Ohashi Bridge in Minamiaso collapsed into the Kurokawa River due to a landslide triggered by the quake.

Reference #14446, #14447, #14449, #14455. #14465:

Maximum Seismic Intensity [Japanese scale]: Minodo 7 (Kumamoto Prefecture: Uki City, Hikawa Town). 38 deaths, 364 injured