Explore the potential impact of a looming 9.0-magnitude earthquake on the West Coast, focusing on seismic risks due to tectonic activity. Discuss current preparedness levels across the region, highlighting gaps and strengths in infrastructure and emergency planning. Incorporate insights on the science of earthquakes, especially seismic waves, to inform readers about the natural processes involved. Address what individuals and communities can do to better prepare for such events. Conclude with expert suggestions for improving regional resilience against future seismic threats.