  Forward wavefield simulation is an important step in Full Waveform Inversion
systems. Fast simulations are instrumental to get inversion result in
reasonable time frames. Most of research and software aims towards utilizing
costly computer clusters composed of multiple CPUs and numerous high end GPUs
to shorten the forward simulation time. Using this type of hardware has some
disadvantages as: high cost, complex programming models and unavailability of
resources. In this work, we present a finite difference elastic 3D wavefield
forward simulation that takes advantage of any modern low end GPU, by using the
GLSL shading language.Some of the advantages of using GLSL are: runs in any
modern GPU, has a simplified computing and memory model and provides state of
art performance thanks to its very well optimized vendor developed drivers. We
show that our GLSL implementation easily outperforms a multicore CPU
implementation in a modern PC. We further benchmark our result using a real
seismic event, and show that we can get accurate simulations in reasonable time
using our system.
