The tremor hit at 10:48 pm (14:48 GMT), with the epicenter 77 kilometers (46 miles) southeast of Nanao, a coastal town in northeastern Ilan county. It originated 10 kilometers under the seabed.

No casualties were immediately reported.

A powerful quake with a magnitude of 6.7 hit the island Monday, waking residents from their sleep and triggering rock falls on to a highway.

Taiwan's worst tremor, measuring 7.6 on the Richter scale, struck in September 1999, leaving some 2,400 people dead.

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