A magnitude 5.1 earthquake struck an area 58 kilometers east-northeast of Chiba, off Japan's Chiba Prefecture, at 9:27 p.m. Korean time on the 1st.
The quake hit at around 9:27 p.m. in an area 58 kilometers east-northeast of Chiba, according to local media including TV Asahi. The epicenter was 50 kilometers deep.
The Japan Meteorological Agency said the quake posed no risk of a tsunami. Shaking measuring 3 on Japan's seismic intensity scale was observed in parts of Ibaraki and Chiba prefectures.
The agency rates seismic shaking on a 10-step scale: 0, 1, 2, 3, 4, 5-weak, 5-strong, 6-weak, 6-strong and 7.
An intensity of 3 means almost everyone indoors feels the shaking.
The Korea Meteorological Administration said it found no impact in South Korea from the quake.
