An earthquake with a preliminary magnitude of 5.0 hit Tokyo Wednesday afternoon, briefly disrupting train and air services.
Four people were reported injured in Tokyo and Chiba Prefecture by the 4:30 p.m. quake. The earthquake's focus was 80 km below ground in northwestern Chiba Prefecture, the Meteorological Agency said.
Bullet trains on the Tokaido Shinkansen Line temporarily suspended operations between Tokyo Station and Odawara Station in Kanagawa Prefecture.
Operations of eight bullet train runs were delayed for up to about 20 minutes, affecting some 7,300 passengers.
As for air traffic, Tokyo's Haneda airport shut its three runways for checks but reopened them about 20 minutes later; more than 10 flights were delayed.
The quake measured 4 on the Japanese seismic intensity scale of 7 in parts of Tokyo, Saitama, Chiba and Kanagawa prefectures. It hit 3 in Yokohama.