Yeah the last tsunami to hit cali was right after the last Japan quake last year, it only was at the right angle for a few places, but one of the them was right in that area. Though not devastating, it still did lots of damage. Pretty much totaled the harbor at Crescent City, and did lots of damage at Santa Cruz and Ventura - and at that they were not huge waves by any stretch. The footage and shots from Japan of what a strong one can do is just mind-blowing.
And we have lahar evacuation areas in the US, the Seattle/Tacoma is the largest, but we have active volcanoes on the West Coast from upper California* all the way through Alaska. If/when Mount Hood ever heats up again Portland will have to look at the same things that Washington put into effect.
* - one of my favorite National Parks is Lassen, which went off in 1915, the area of the pyroclastic flow is still devastated, as is the area east of Mount St. Helens. Mind-blowing hiking and camping in both areas. Spending a night up in the Lassen caldera is a groovy psychedelic adventure even if you're 100% totally straight. At MSH you can hike up to the caldera but it's still too hot to go into.
