Magnitude 5.9 earthquake strikes east Japan near Tokyo, injuring 37 people
A magnitude 5.9 earthquake struck southern Ibaraki Prefecture at a depth of 68 kilometres on Sunday morning, triggering emergency alarms and disrupting regional train traffic across greater Tokyo.
Tremors across the Kanto region
At approximately 02:00 local time on Sunday, 23 August 2026, an earthquake with a magnitude of 5.9 struck the southern section of Ibaraki Prefecture in eastern Japan. The shaking coincided with 19:00 on Saturday in Switzerland. The seismic event generated strong vibrations across the broader Kanto area and the Tokyo metropolitan district. The subterranean rupture occurred at a focal depth of 68 kilometres beneath the surface, according to data released by the Japan Meteorological Agency. In its separate evaluation of the seismic waves, the United States Geological Survey placed the earthquake at a magnitude of 5.8. Automated public alert systems activated throughout the capital and surrounding prefectures, broadcasting urgent warning notifications to mobile phones and sounding municipal sirens along public streets.
- Torrential rain falls across the Kanto region, saturating soils
- Magnitude 5.9 earthquake strikes southern Ibaraki Prefecture at a depth of 68 km
- East Japan Railway Company delays regional trains as 37 injuries are reported
Casualties and structural assessment
The Japanese Fire and Disaster Management Agency announced that at least 37 individuals suffered injuries as a result of the earthquake. The reported casualties involved domestic accidents triggered by the sudden nocturnal movement, including an eighty-year-old woman in Yokohama, south of Tokyo, who fell while leaving her bed and injured her hip. Regional emergency services conducted rapid safety evaluations across residential communities and municipal infrastructure in several prefectures. In the city of Saitama, situated directly north of Tokyo, one building sustained minor damage during the tremors. The disaster management agency verified that no severe structural destruction or building collapses occurred in the immediate aftermath of the tremor.
- JMA
- 5.9
- USGS
- 5.8
Transport disruptions and rail inspections
The early morning earthquake affected transport infrastructure throughout the capital region on Sunday. East Japan Railway Company suspended and altered schedules for regional train services while engineering personnel carried out track and facility inspections across the rail network. Commuter and suburban lines experienced delays as maintenance crews verified that overhead wiring, electrical equipment, and railway tracks remained intact following the ground motion. The meteorological agency confirmed that the earthquake did not generate any tsunami hazard along the Pacific coastline of eastern Japan. Operational teams worked through Sunday morning to inspect railway rights-of-way, clear potential track obstructions, and resume regular passenger services across greater Tokyo.
Landslide warnings and aftershock risks
The Japan Meteorological Agency issued official advisories concerning secondary geological hazards in the affected prefectures. Heavy and torrential rainfall had fallen across the Kanto region during the afternoon on Saturday, saturating soils across both urban and rural hillsides. Seismologists and weather officials stated that the combination of antecedent rainwater accumulation and strong seismic vibrations had weakened slope stability, creating an increased risk of localized landslides. The agency also warned residents in eastern Japan of the possibility of strong aftershocks over the coming days. Emergency management authorities advised people in the affected zones to maintain awareness, monitor ongoing alerts, and exercise caution near unstable terrain.
