An earthquake with a preliminary magnitude of 4.8 shook eastern Japan on Thursday evening, the Meteorological Agency said.
There were no immediate reports of casualties or damage from the 5:18 p.m. quake and no tsunami warnings were issued.
Bullet train services were temporarily disrupted on the Tokaido Shinkansen Line between Tokyo and Odawara stations for around 10 minutes. Services resumed at 5:30 p.m.
The quake measured 4 on the Japanese intensity scale to 7 in eastern and western Kanagawa Prefecture, and 3 in parts of Tokyo, Ibaraki, Tochigi, Saitama, Chiba and Shizuoka prefectures.
The quake's focus was in Tokyo Bay, 70 km below sea level, the agency said.
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