1) There is nowhere you could be on the planet to survive something like this.
2) You have to be more specific in what you mean by "pre-impact" state - e.g. the Earth's axis has been tilted ever since this collision, so it never really goes back to the way it was. But it only takes a couple hundred years for everything to cool back into solids!
3) You're welcome! You can see more of our stuff by taking a look at https://www.facebook.com/AdvancedVisualizationLab/ , avl.ncsa.illinois.edu , cadens.ncsa.illinois.edu , or learn how to do what we do by taking our MOOC at https://www.coursera.org/learn/data-visualization-science-communication