An earthquake with a magnitude of 5.6 struck the Kanto region of Japan at 2:28 p.m. on Monday, the Japan Meteorological Agency said, adding there was no danger of a tsunami.
The epicenter of the quake was about 51 kilometers deep in northern Saitama Prefecture.
The quake had a lower 5 intensity in Tsuchiura, Ibaraki Prefecture, a 4 in parts of Saitama, Ibaraki, Tochigi, Gunma, Chiba and Kanagawa prefectures. The intensity was 4 in some of Tokyo's 23 wards and a 3 in the other wards.
Buildings shook briefly in Tokyo and smartphone alerts could be heard going off in offices.
There were no immediate reports of damage or casualties.
Tokyo's subway trains were briefly halted, and Narita Airport's two runways were also closed for 10 minutes for checks, NHK reported. Haneda airport was unaffected.© Japan Today