Overview. GMSimViz is an automation tool that produces an animated 3D visualization of geological faults, ground motion and other earthquake related data. Typically verification of ground motion simulations involves various data visualization methods, and a 3D animation is an excellent medium to understand the nature of an earthquake. It also helps to communicate with the general public, but its production has been largely left to time-consuming manual interaction with no existing automation tool available. GMSimViz was created to fulfill this need and produces a quality 3D animation directly from the simulation data in a fully automated way. GMSimViz is published on GitHub under MIT license. A video of the result of GMSimViz is also available on Youtube (please see '5. External Sources' at the bottom for URLs and QR codes).