Tokyo-area magnitude 5.9 earthquake shakes eastern Japan on August 23, 2026

Around 2 a.m. local time on August 23, 2026, a tremor with a preliminary magnitude of 5.9 originated in southern Ibaraki Prefecture, northeast of Tokyo. The Japan Meteorological Agency (JMA) placed the hypocenter at a depth of about 70 km, while the U.S. Geological Survey recorded a magnitude of 5.8. The quake reached “lower 5” on the JMA’s seven-point seismic-intensity (shindo) scale in Tokyo’s Adachi Ward and in parts of Ibaraki, Saitama and Chiba prefectures. No tsunami warning was issued.

Strong Magnitude 5.9 Earthquake Shakes Tokyo Tokyo Earthquake Explained: How Strong Was Japan’s 5.9-Magnitude Quake and is There an Aftershock Risk? Magnitude 5.9 quake in Ibaraki shakes Tokyo for first time in 5 years Japan Earthquakes Injure 37 in Tokyo Area: No Tsunami, Shinkansen Unaffected

• Injuries: Official tallies differ. The Fire and Disaster Management Agency reported 37 injuries across five prefectures; other outlets cited 23 injuries.

The Weather Channel

• Transport: Express trains to Narita Airport and several local services were delayed; Shinkansen bullet trains continued operating normally. JR East reported temporary suspensions and reduced speeds on lines such as Joban, Keihin-Tohoku, and Tobu Railway.

Japan Earthquakes Injure 37 in Tokyo Area: No Tsunami, Shinkansen Unaffected

• Infrastructure: An underground water pipe ruptured in Tokyo’s Koto Ward, flooding a road before repairs stopped the leak. Approximately 460 homes experienced brief power outages, restored by the following morning.

Moderate earthquake shakes Japan, injuring more than 30 in the Tokyo region

• Nuclear facilities: The Nuclear Regulation Authority confirmed no abnormalities at the Tokai No. 2 plant, Fukushima Daiichi, Fukushima Daini, or other sites in the region.

Tokyo Earthquake Explained: How Strong Was Japan’s 5.9-Magnitude Quake and is There an Aftershock Risk? China DailyMagnitude 5.9 earthquake jolts eastern Japan, injuring over 20 people The Straits Times

The quake’s deep focus limited surface damage, but sudden shaking and darkness caused most injuries as residents rose from bed. Long-period ground motion of Class 2 was recorded in Tokyo’s 23 wards, producing noticeable swaying in high-rise buildings. Water-pipe failure and localized power loss illustrated secondary effects, while the rapid restoration of Shinkansen service highlighted the resilience of Japan’s high-speed rail network.

Japan Earthquakes Injure 37 in Tokyo Area: No Tsunami, Shinkansen Unaffected

• The JMA issued an emergency earthquake alert within seconds of detecting the primary waves and warned residents to remain alert for additional tremors of up to lower 5 intensity for about a week.

Tokyo Earthquake Explained: How Strong Was Japan’s 5.9-Magnitude Quake and is There an Aftershock Risk?

• Prime Minister Sanae Takaichi announced on X that a special task force had been established at the prime minister’s crisis-management centre to assess damage and provide timely public information.

Magnitude 5.9 quake in Ibaraki shakes Tokyo for first time in 5 years

• The Nuclear Regulation Authority reiterated that all nuclear facilities in the region were operating normally and reported no safety-system failures.

Tokyo Earthquake Explained: How Strong Was Japan’s 5.9-Magnitude Quake and is There an Aftershock Risk?

Naoko Ishizaki, 57, of Kawaguchi, Saitama, said she was jolted awake, took shelter in a hallway, and later found dishes displaced and windows opened.

Strong Earthquake Strikes Tokyo and Nearby Areas, Injuring Several

• Injury counts: Sources report 37 injuries versus 23 injuries; the Kanagawa prefecture count varies between 8 and 9.

Earthquake Rattles Tokyo, Injures Dozens Across Kanto Region

• Casualty verification: No fatalities have been confirmed, but the full extent of minor injuries remains unverified.

The Watchers

• Secondary hazards: The JMA warned of landslide risk due to recent heavy rain, though no landslides have been reported.

Magnitude 5.9 quake in Ibaraki shakes Tokyo for first time in 5 years

The JMA’s week-long aftershock advisory advises residents in the strongest-shaking areas to stay prepared for further tremors, particularly during the next two to three days. Authorities will continue monitoring ground-motion effects on high-rise structures, inspect water-utility infrastructure, and assess any landslide risk in rain-saturated zones. The government’s task force will provide ongoing updates as assessments progress.

Japan earthquake injures 37, disrupts trains and ruptures water pipe in Tokyo