Japan faces a series of strong earthquakes in late June 2026

On June 28 a magnitude‑6.1 quake struck offshore Iwate, producing a maximum intensity of 5‑weak in Aomori and Iwate prefectures. No injuries or building damage were reported and no tsunami was expected.

A day earlier, a magnitude‑6.0 quake with a maximum intensity of 6‑weak hit the Yamanashi region. The tremor was felt across Shizuoka, where in Koyama‑cho a water‑tank ruptured, cutting water to about 100 households. By June 29, 38 homes had reported damage such as collapsed walls and broken roofs, prompting local authorities to consider additional disaster‑waste disposal and volunteer support.

Separately, the Japan Meteorological Agency issued a routine alert for a minor magnitude‑1.8 event in Kumamoto on June 29. The quake registered only intensity 1 and posed no tsunami risk.

In Fukuoka, officials released a worst‑case scenario analysis for a potential combined rupture of the Keiko fault system and the nearby Koro‑jima offshore fault, which could generate a magnitude‑8.1 earthquake, widespread intensity‑7 shaking and an estimated death toll of up to 3,300. The projection is being used to guide emergency‑supply stockpiling and shelter planning.