A 7.4-magnitude aftershock hit Japan about two hours ago, and less than a month after the country was devastated by a 9.0 earthquake and tsunami.

The aftershock hit 30 miles off the coast of the Miyagi prefecture– under the water– and prompted a tsunami warning, which was canceled 90 minutes later.

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According to the AP, officials at the damaged Fukushima Dai-ichi nuclear plant reported there was no immediate sign of new problems caused by the aftershock.

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Reports say that buildings in cities as far as Tokyo were shaking for up to a minute.

The US Geological Service reports that, in addition to this 7.4 earthquake, the same region has been struck with four 4.6-magnitude earthquakes, one 4.7-magnitude, and a 4.9-magnitude earthquake as well.