An excavator works at a building destroyed in the quake in Jiegu Town, Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province, May 10, 2010. Over 30 excavators, loaders and trucks assembled to demolish the dilapidated houses in the quake-hit area. The Yushu quake destroyed houses with an area of over 5 million square meters, and produced more than 4 million cubic meters of construction rubbish. [Xinhua]