[Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of Japan Near Surface Geophysics Asia Pacific Conference, Beijing, China 17-19 July 2013 - Beijing, China (17 July to 19 July)] Near Surface Geophysics Asia Pacific Conference, Beijing, China 17-19 July 2013 - A Parallel 3-D Finite Difference, Time Domain Method for Modeling of Transient Electromagnetic Diffusion Phenomena in Tunnels