Two earthquakes measuring 6.4 and 6.7 on the Richter scale jolted Taiwan on Tuesday evening, causing Japan's Meteorological Agency to issue a tsunami warning for both Taiwan and the Philippines.
The first quake, measuring 6.7, struck at 8.26 pm with its epicentre 22.8 km off Henghcun on Taiwan's southern tip, 22 km under the sea, the Seismological Observation Centre said.
It was followed by a second quake, measuring 6.4, in the same area, occurring at 8.34 pm, the centre said.
The quakes caused power cuts in Kaohsiung, a port city in south Taiwan.
Although the quake struck south Taiwan, buildings in Taipei in north Taiwan swayed and windows rattled.
Japan's Meteorological Agency issued a tsunami warning for south Taiwan and the Philippines, warning that a one-metre tsunami was headed towards the east Philippines.
However, Taiwan's Seismological Observation Centre did not issue a tsunami warning.
Taiwan sits on the Circum-Pacific seismic belt and 85 per cent of the world's earthquakes occur in this area.