The quake struck at 4.46pm Bangkok time, according to Thai Meteorlogical Department.
Facebook was flooded with postings from people in Phuket, some of them said they fled from their houses after noticing that their houses shook.
Dr Weerasak Lawtongkum said he was on the first floor of his house when he felt the shaking.
"The shaking last about a minute and then stopped," he said.
People shopping at the Central Department's Phuket Branch also ran out of the buildings because of the shaking.
Spring News TV quoted a tweetple as saying the tremor this time was heavier than last time. The tweetple who was staying at Movenpick hotel said his room shook like it was beaten.
Traffic congestions in many roads including along the beaches, at Phuket airport and Rachada Road took place following the tremors.
Thai Meteorlogical Deparmtnet reported Monday that seven quakes hit Indonesia on Monday. It did not say whether they were aftershock from the last week's quake or not.