Japan has been rattled by a couple of aftershocks within minutes, causing buildings in Tokyo to sway.
The first, measuring 6.2 in magnitude, struck Tuesday night off the coast of Fukushima prefecture, 200 miles (325 kilometers) northeast of Tokyo and near where a massive quake hit last week.
Three minutes later, a second 6.0-magnitude quake rumbled under Shizuoka prefecture, 55 miles (90 kilometers) southwest of Tokyo.
Friday's huge temblor spawned a tsunami that wreaked havoc along Japan's northeastern coast, and officials believe it killed more than 10,000 people.
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