Authorities in southwestern China’s Chengdu have maintained strict Covid19 lockdown measures on the city’s population of 21 million despite a major earthquake that killed at least 65 people in outlying areas.

Footage circulating online on Tuesday showed workers wearing top-to-bottom protective gear preventing residents of apartment buildings from exiting through locked lobby doors following Monday’s 6.8 magnitude quake centred in the surrounding province of Sichuan.

Buildings in Chengdu and other parts of western China were shaken by the quake. No damage was reported in the city. The quake struck a mountainous area in Luding county, which sits on the edge of the Tibetan Plateau roughly 200km from Chengdu, where tectonic plates grind up against each other.

Despite only recording a handful of cases, Chengdu’s lockdown is the most severe since China’s largest city of Shanghai was placed in isolation over the summer, prompting rare protests in person and online.

China’s authoritarian Communist political system demands strict adherence to measures dictated by the central leadership overwhelmingly dominated by party leader Xi Jinping.

Local leaders, including Sichuan’s recently appointed provincial party secretary, are often parachuted in from Beijing with little knowledge of local conditions and a firm mandate to carry out Xi’s dictates.

The ruthless and often chaotic enforcement of the Shanghai lockdown led to widespread complaints over shortages of food, medication and access to health care.

In a sign of how little has changed, at least one district in Chengdu has banned even the ordering of takeout meals and coffee, according to a notice posted on the Internet.

China has stuck to its hard-line “zero-Covid” policy of compulsory testing, lockdowns, quarantines and masking despite advice from the World Health Organisation and moves by most other countries to open up again since the virus was first detected in the central Chinese city of Wuhan in late 2019.