Alaska has had several of the world’s largest earthquakes of the past 100 years. Large earthquakes pose a hazard to all three main population centers in Alaska: Anchorage, Fairbanks, and Juneau. This hazard can be quantified by using supercomputers to simulate how seismic waves travel through the complex crustal structure of Alaska. Animations reveal how seismic waves propagate in Alaska for different possible earthquakes. These simulations are computed at the Arctic Region Supercomputing Center. This lecture will show how state-of-the-art modeling and computing are being used to improve our understanding of earthquakes and structural variations in Alaska.