TOKYO — A magnitude 5.9 earthquake struck eastern Japan early Sunday, August 23, sending strong tremors through Tokyo and surrounding parts of the Kanto region, disrupting railway operations and prompting authorities to warn residents to remain alert for possible additional earthquakes.
The earthquake struck at around 2 a.m. local time, with its epicenter in southern Ibaraki Prefecture at a depth of roughly 68–70 kilometers, according to Japan’s weather agency. The shaking reached lower 5 on Japan’s seismic intensity scale of 7 in parts of Ibaraki and central Tokyo.
The tremor was strong enough to trigger emergency earthquake alerts on mobile phones and interrupt transportation across parts of the region.
Train services disrupted as operators inspect tracks
Railway operators temporarily halted or slowed several services while crews checked tracks and infrastructure for possible damage.
JR East reported disruptions affecting a number of conventional lines, with some services suspended from the first trains of the morning and others operating with delays or reduced service. Some limited-express services were also cancelled.
Tokyo’s rail network also recorded delays. Tokyo Metro, for example, reported delays on the Namboku Line following the earthquake.
However, Shinkansen bullet-train services continued to operate normally, according to reports citing JR East.
The disruption highlights how even a moderate earthquake can quickly affect Tokyo’s enormous commuter network, where millions depend on rail services every day.
Injuries reported, but no major widespread destruction
Authorities reported injuries across several prefectures, with the number changing as officials continued collecting information.
The Associated Press reported that at least 37 people were injured across five prefectures, including Tokyo, Saitama, Kanagawa, Chiba and Ibaraki. Many injuries were described as minor, with people hurt while attempting to evacuate or reacting to the sudden shaking.
Other reports published earlier in the day cited lower injury totals, underscoring that the situation was still developing.
There was also limited infrastructure damage. An underground water pipe reportedly ruptured in Tokyo’s Koto Ward, while temporary power disruptions affected parts of the capital. Electricity was subsequently restored, according to reports.
No tsunami threat
Despite the strength of the shaking, no tsunami warning was issued.
Authorities also reported no abnormalities at nuclear facilities in the affected region, including the Tokai No. 2 nuclear power plant and the Fukushima Daiichi and Fukushima Daini facilities.
That helped limit concerns of a wider disaster following the early-morning earthquake.
Japan warns residents to stay alert
The bigger concern now may be what happens next.
Japan’s Meteorological Agency warned that additional earthquakes capable of producing lower-5 intensity shaking could occur during the following week, with particular caution urged during the next several days.
The warning does not mean that another major earthquake is certain to occur. Rather, residents in the affected region are being urged to remain prepared because aftershocks and additional seismic activity can follow a significant earthquake.
Prime Minister Sanae Takaichi’s government established a task force to assess the situation and coordinate the response.
Why this earthquake matters for Tokyo
Sunday’s earthquake is another reminder of the seismic risks facing Japan, one of the world’s most earthquake-prone countries.
Tokyo and the wider Kanto region sit in a highly active seismic environment, making earthquake preparedness a routine part of daily life. The fact that the latest quake produced strong shaking, injuries and widespread rail disruption despite causing no tsunami illustrates how quickly a moderate earthquake can affect one of the world’s largest metropolitan areas.
For residents and travelers, authorities continue to emphasize basic earthquake preparedness, including staying away from damaged structures, following official alerts and checking transportation information before traveling.
For now, the immediate tsunami threat is absent and no major nuclear-facility problems have been reported. But with Japan’s meteorological authorities warning of possible further shaking, the situation remains one to watch closely
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