On February 8, Five people were injured and some old houses were damaged after an quake measuring 4.9 on the Richter scale hit Ludian county in China's southwestern Yunnan province, China natural disaster Networks Centre had said.
A strong quake of magnitude 6.8 struck north of Antarctica on Wednesday, the U.S. Geological Survey said, but it was not expected to cause a tsunami.
Emergency services are still sifting through the rubble, looking for survivors trapped in debris.
An quake rocked China's western Xinjiang region on Thursday, killing eight people and injuring another 11, state media reported.
Chinese state-run news agency Xinhua reported that the epicentre of the quake that struck at 5.58am local time (10.58pm BST previous day) was in the southeast part of the Pamir Plateau.
It says there have been frequent aftershocks.
Xinhua news agency said four people had been confirmed dead and some injured were sent to hospital.
Search and rescue work was under way, it added.
Earthquakes are common in China's west.
The county reportedly has a population of around 33,000.
Xinjiang is frequently jolted by earthquakes, most of which cause little damage. China's deadliest natural disaster recorded 7.9 magnitude with a depth of 19 kilometres (12 miles).
So far, the quake has affected lives of more than 12,000 people.