As the size and complexity of the simulation data increase, the need to visualize the data in three-dimensional (3D) space is growing in the geophysical community. The modern virtual reality (VR) technology provides a technical solution to the demand. Among modern VR systems, the CAVE provides the most effective VR environment. We have developed a VR visualization software for the CAVE system that incorporates the volume rendering visualization method. Implementation of a high speed volume rendering using the texture-map technique in the CAVE and its applications to various geophysical simulation data produced by Earth Simulator are examined.