  Faster explicit elastic wavefield simulations are required for large and
complex three-dimensional media using a structured finite element method. Such
wavefield simulations are suitable for GPUs, which have exhibited improved
computational performance in recent years, and the use of GPUs is expected to
speed up such simulations. However, available computational performance on GPUs
is typically not fully exploited, and the conventional method involves some
numerical dispersion. Thus, in this paper, we propose an explicit
structured-mesh wavefield simulation method that uses INT8 Tensor Cores and
reduces numerical dispersion to speed up computation on GPUs. The proposed
method was implemented for GPUs, and its performance was evaluated in a
simulation experiment of a real-world problem. The results demonstrate that the
proposed method is 17.0 times faster than the conventional method.
