June 2. Preliminary expert analysis showed that subsidence in the Guangxi Zhuang Autonomous Region in southern China could be caused by pumping water in karst terrain.
In the karst landscape increase underground wells for water supply may lead to the collapse of karst and thus increase the likelihood of subsidence, the chief engineer of Electric Power Design Institute of Guangxi Zhunguan Ma.
Investigation into the cause of the incident is continuing.
No injuries were reported, but 844 villagers were evacuated after subsidence near the school in the village Tanlo, administratively subordinate Sisyantan District of Nanning City — the administrative center of Guangxi Zhuang Autonomous Region.
According to the local government, formed as a result of subsidence failure is 1.5 meters in depth and 2.5 meters in width. As a result of subsidence of one building collapsed, six out of alignment and one cracked, said local authorities.
According to the local administration, the lack of water prior to the incident the school hired workers for the drilling of 70 meters artesian well.