Around 40 minutes after the quake, an 80cm tsunami wave hit a port in Kuji in Iwate, according to the weather agency, which had initially estimated the magnitude at 7.4 before revising it upwards.
The agency said the later advisory about another possible earthquake only reflected an elevated risk, rather than providing any specific predictions.
“Although the probability is low, there is a possibility of another major earthquake occurring; therefore, please review your earthquake preparedness measures in these areas,” it said in a statement.
By the evening, authorities slightly downgraded the tsunami warning but kept an advisory for possible waves up to 1m along the vast northeastern Pacific coast.
There were no immediate reports of serious injuries or significant damage, Chief Cabinet Secretary Minoru Kihara told a news conference.
Footage from national broadcaster NHK showed no clearly visible damage around several ports in Iwate.
But officials have reiterated that aftershocks could strike the area over the coming week, particularly within the next two to three days, potentially “causing even stronger shaking”.
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