The strongest of the more than 200 earthquakes was a magnitude 6.1 measured by the USGS and followed a deadly tremor on April 3.
Taiwan has been hit by a swarm of dozens of earthquakes that caused buildings to shake, with the government saying they were aftershocks from a huge quake that hit the island more than two weeks ago.
The strongest recent earthquake measured by the U.S. Geological Survey was a magnitude 6.1 earthquake that occurred around 2:30 a.m. (6:30 GMT), followed by a magnitude 6.0 tremor a few minutes later.
The Central Weather Bureau in Taipei announced 6.0 and 6.3 respectively.
Seismic activity centered around Hualien on the east coast shook buildings in much of northern, eastern and western Taiwan overnight. There were no reports of casualties.
Kevin Lin, an office worker living in the capital Taipei, told AFP news agency that the quake woke him up.
“I was so scared I couldn't move and stayed in bed,” said the 53-year-old.
A 5.8-magnitude tremor rocked the capital around 8 a.m. (00:00 GMT) as commuters headed to work.
Mountainous Hualien County, about 150 kilometers (93 miles) from Taipei, was the epicenter of a magnitude 7.2 earthquake that hit the island on April 3, causing extensive damage to buildings in Hualien City and devastating the surrounding countryside. caused landslides in the area.
At least 14 people were killed and more than 1,100 aftershocks occurred.
Taiwan's Central Weather Bureau said the earthquake swarm was also an aftershock.
Wu Jianfu, director of the Seismology Center, told reporters that the latest earthquake was a “concentrated release of energy” and that more earthquakes were expected, although probably not as strong.
As aftershocks continue to hit Hualien City, the government announced that schools and offices will remain closed on Tuesday.
Buildings that partially collapsed in the April 3 earthquake, including the Full Hotel and the nearby Suidou Building, suffered further damage. Both were empty and already marked for demolition.
The April 3 earthquake was the most severe in Taiwan in 25 years, but extensive public awareness efforts and strict building codes kept damage relatively contained.
The island of 23 million people is located near the junction of two tectonic plates and is not immune to powerful earthquakes.