A mile or so north of Otter Rock, there is a shelf of elevated terrace developed on the Columbia River Basalt flows. This creates a nice flat space that can be developed for residences or vacation homes. I'm guesstimating these are about 60-70 feet above sea level, so they're probably out of the tsunami risk zone in the event of a great Cascadia quake/tsunami. And since you ask, no, I can't go to the coast these days without posing questions like that to myself. It's not a phobia, it's not even really a "jittery" feeling. It's more than simply an intellectual curiosity, though. I consider it a sensible feeling of caution, like consciously scanning a street scene before I cross... "Is it safe?" In addition, having the foundations of these dwellings directly on bedrock means that the effects of the shaking will probably be less severe than if they were on unconsolidated fill. Long and short, this is a highly desirable spot for development, and not just for the view.