Entertaining detail: Lake Tahoe is actually vulnerable to tsunamis: http://unofficialnetworks.com/tahoe-tsunami-26376/ (Note that in this news article they correctly define seiche, but get a little confused. The landslide-generated wave that happened thousands of years ago would generate a destructive tsunami. There'd likely be a seiche that resonated for a while after the tsunami, but it would be unlikely to be as destructive as the tsunami itself.) Seems like the map in question could be greatly improved if cities vulnerable to tsunamis were identified by points with colors to indicate something about degree of risk, and if each point linked to a tsunami inundation map for that city.