Japan

Brief · 15 September 2026

Japan recorded a cluster of moderate earthquakes over the past week, the most notable being an M5.1 event south of Yudomari and an M4.6 quake east of Minami-Sōma that exposed an estimated 333,558 people to shaking. Several other M4.6-5.1 earthquakes struck at varying depths across the country, while a tropical storm, a flood, and multiple volcanoes remained under separate observation.

Earthquake Five significant earthquakes struck Japan this week, ranging from M4.6 to M5.1. The largest population exposure was reported for the M4.6 quake 49 km east of Minami-Sōma, affecting an estimated 333,558 people, while quakes near Yudomari and Mutsu each exposed roughly 7,446 and 12,647 people respectively.

• An M5.1 earthquake 101 km south of Yudomari, first tracked on 13 September, is a newly reported event.
• An M4.6 earthquake 49 km east of Minami-Sōma, first tracked on 14 September, is a newly reported event.

Generated by claude-sonnet-5 at 15 Sept, 10:06 UTC from Hazardly's own event records for the seven days to 15 September 2026. Not reviewed by a person before publication. Outbreak lines name the disease and country only; WHO's bulletin text is on each outbreak's event page.