Chief Cabinet Secretary Yoshihide Suga says the government has received reports of light injuries caused by the quake.
Suga says there are no reports of fires. He says tsunami up to several centimeters high have been observed so far.
He says there have been no reports of major landslides, damage to roads or collapsed homes.
Suga also says 7,800 homes in Yamagata and Niigata prefectures are without power.