A powerful quake rattled northern Japan Sunday evening, followed by several more temblors, according to the Japan Meteorological Agency. A tsunami advisory was issued.

The earthquake, with an upgraded magnitude of 6.9 and depth of 16 kilometers (10 miles), struck off the coast of Iwate prefecture at 5:03 p.m. Japan time.

There were no immediate reports of injuries or damage, or any reports of abnormalities at the two nuclear power plants in the area.

The agency issued an advisory for a tsunami of up to 1 meter (3 feet) along the northern coastal region, and subsequently said the water could reach as high as 3 meters in some spots.

A tsunami of about 10 centimeters (4 inches) was detected at Ofunato city in Iwate Prefecture, Ominato port, Miyako and Kamaishi, and subsequently as high as

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