A strong earthquake struck eastern areas of Hokkaido Prefecture on Saturday, prompting authorities to urge vigilance.
The quake had a magnitude of 5.8 and measured a lower 5 on the Japanese seismic intensity scale in the city of Nemuro.
The agency called on people in areas jolted by the quake to remain alert for more temblors measuring up to a lower 5 for about a week.
An ocean plate is subducting beneath a land plate off the southeastern coast of Hokkaido, and the quake occurred at the boundary of the two plates.
Author's summary: Strong quake hits Hokkaido with magnitude 5.8.