Chinese Premier Wen Jiabao visits stricken areas . The U.S. and China have been at odds over the South China Sea for years. Their magnitudes range between 4.8 and 5.6 , the U.S. Geological Survey says . Initial estimates put the `` direct economic losses '' from the tremors at more than half a billion dollars , the news agency said . More than 430,000 houses are damaged and 6,600 destroyed , state media reports .
Chinese Premier Wen Jiabao visits stricken areas . The U.S. and China have been at odds over the South China Sea for years. Their magnitudes range between 4.8 and 5.6 , the U.S. Geological Survey says . More than 430,000 houses are damaged and 6,600 destroyed , state media reports .