A magnitude 5.5 earthquake struck 5 km east-southeast of Asahi, Japan, this afternoon, according to the U.S. Geological Survey.

An earthquake struck northeastern Chiba Prefecture, near Tokyo, shortly after midnight on October 29. According to the Japan Meteorological Agency, the epicenter was in the northeastern part of the prefecture, and the quake hit at around 12:07 a.m. local time.

The agency first put the magnitude at 5.4 with a depth of 50 km, then revised both after reviewing observation data. The final estimate places the focus at a depth of about 52 kilometers. There is no tsunami threat.
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The strongest shaking was recorded in the town of Yokoshibahikari, which registered “lower 5” on Japan’s seismic intensity scale. Asahi, Sosa, Katori and Sanmu saw intensity 4. The quake was also felt in Tokyo and the neighboring prefectures of Tochigi, Ibaraki and Saitama.

Police said no damage had been reported in Chiba Prefecture as of the morning, and no expressway sections in the Tokyo area were closed. The last time Chiba saw “lower 5” shaking was about two months ago, after a magnitude 5.9 quake in southern Ibaraki Prefecture on August 23. Officials are urging residents to stay alert, as aftershocks of similar strength are possible over the next week.

The nearest live camera is Dog Sports Field in Motosuka, 28 km from the epicentre. It gives a plain local view from a town in Chiba Prefecture. Narita International Airport is 30 km away. That camera looks over one of Tokyo's airports, in the eastern part of Greater Tokyo, where a large share of Japan's international passenger traffic passes through. It is also a major cargo airport.