A 6.1 magnitude earthquake hit Taiwan on Tuesday, with tremors felt in capital Taipei and across the country.
The U.S. Geological Survey issued an alert saying the earthquake's epicentre was around 90km off the coast of Taiwan, at a depth of more than 240km, reports the independent.
Taiwan's Central Weather Bureau intially put the magnitude at 7.2.
There were no immediate reports of injuries or significant damage so far.
Though there was no immediate alert or advisory from the Pacific Tsunami Warning Center, the USGS's initial analysis suggested some 30 million people lived near enough to the earthquake epicentre to experience some shaking.
Residents were seen tweeting about the tremor.