SHANGHAI, May 12 (Reuters) - There were no visible signs of damage to China's massive Three Gorges Dam after a strong earthquake rocked China's Sichuan province on Monday, a witness said.

An earthquake with a magnitude of 7.5 struck China's Sichuan province on Monday, less than 100 km (60 miles) from the provincial capital of Chengdu, the U.S. Geological Survey said on its Web site.

The epicentre was hundreds of kilometres from the Three Gorges Dam.

The quake was felt across much of China and as far west as Bangkok, Thailand's capital, some 3,300 km (2050 miles) away, where office buildings swayed for several minutes.

It was not immediately clear if there were any casualties or damage from the tremor.

(Reporting by Joseph Chaney; editing by Ken Wills)

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