Officials said the powerful aftershock was centred in a mountainous region about 200 kilometres northwest of Tokyo.
Meanwhile, the German embassy in Tokyo announced the German government was providing 50,000 dollars in relief aid to victims of the series of quakes that struck the region on October 23.
Those tremors killed at least 38 people, destroyed thousands of homes and forces tens of thousands of people to take refuge in temporary shelters.
German officials said the aid will be used to provide additional shelters to the approximately 46,000 people still suffering in the region. dpa ln blg
- Deutsche Presse Agentur
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