Strong 5.9 Earthquake Shakes Tokyo and Eastern Japan, Injuring Dozens

A magnitude 5.9 earthquake struck eastern Japan early Sunday, injuring at least 37 people across the Tokyo region and disrupting transit networks without triggering a tsunami.

The earthquake struck at approximately 2:00 AM local time on August 3. Its epicenter was located in southern Ibaraki Prefecture at a depth of nearly 70 kilometers.

Shaking registered up to a lower 5 on Japan’s 7-point seismic intensity scale across parts of Ibaraki, Saitama, Chiba, and central Tokyo’s Adachi Ward. The Japan Meteorological Agency confirmed there was no tsunami danger following the quake.

Local emergency management agencies confirmed that at least 37 people sustained injuries across five prefectures, including Tokyo, Saitama, Kanagawa, Chiba, and Ibaraki. Most injuries occurred as residents were startled awake in the middle of the night and fell or collided with doors and furniture while fleeing in panic.

What Was Impacted?

The early morning shaking triggered emergency cell phone alerts across eastern Honshu and caused immediate disruptions to regional infrastructure:

Transit Impacts

• Rail operators temporarily suspended or slowed several regional services, including express lines linking central Tokyo to Narita Airport.
• High-speed Shinkansen bullet train operations continued running on regular schedules.

Infrastructure and Power

• A ruptured underground water main temporarily flooded a roadway in Tokyo’s Koto Ward. Leaks were stopped after repairs.
• TEPCO Power Grid reported localized blackouts affecting roughly 460 households in Tokyo. Power was fully restored by late morning.

Nuclear Safety

Japan’s Nuclear Regulation Authority confirmed no operational irregularities at nearby nuclear facilities, including the Tokai No. 2 plant in Ibaraki or the Fukushima Daiichi and Daini stations.

Japanese Prime Minister Sanae Takaichi established an official emergency task force to coordinate damage assessments and response efforts. Meteorological officials warned residents across eastern Japan to remain alert for potential aftershocks over the coming week.