Taiwan's defence ministry has said it is asking Google to blur satellite images showing what experts say appear to be new military installations on Itu Aba, Taipei's sole holding in the disputed South China Sea.

The revelation of new military-related construction could raise tensions in the contested waterway, where China's building of airstrips and other facilities has worried other claimants and the United States.

Four three-pronged structures off the coast of Itu Aba, as seen on Google Earth.

The images seen on Google Earth show four three-pronged structures sitting in a semi-circle just off the northwestern shoreline of Itu Aba, across from an upgraded airstrip and recently constructed port that can dock 3000-ton frigates.

"Under the pre-condition of protecting military secrets and security, we have requested Google blur images of important military facilities," Taiwan Defence Ministry spokesman Chen Chung-chi said on Wednesday, after local media published the images on Itu Aba.