Strong earthquake in southwest China kills 46

At least 46 people were killed when a strong earthquake struck southwestern China, state media reported, as violent tremors in a remote region damaged homes and left some areas without electricity.

The magnitude 6.6 quake hit about 43 kilometres southeast of the city of Kangding in Sichuan province at a depth of 10 kilometres, according to the US Geological Survey.

Chinese state broadcaster CCTV said that 17 people died in Ya'an city, while 29 deaths were reported in neighbouring Ganzi Prefecture.

"Another 16 people were missing and 50 were injured," CCTV said.

Tremors shook buildings in the provincial capital of Chengdu -- where millions are confined to their homes under a strict Covid lockdown -- and in the nearby megacity of Chongqing, local residents said.

At least one town had suffered "severe damage" from landslides triggered by the quake, CCTV reported.

A road to another town was blocked and telecommunications lines in areas home to more than 10,000 people were severed, the broadcaster said, adding that shocks also forced some power stations offline in the areas of Garze and Ya'an.

Footage broadcast by CCTV appeared to show damaged buildings and a street strewn with fallen masonry in Garze.