Crescent City is named that because,The Bay is Crescent Shaped.There are Huge troughs on the Ocean Floor,adjacent to Crescent City,which in turn Magnify any swells coming inbound to The Shoreline,Couple that with the fact that Crescent city is Not too far from Sea-Level itself in Elevation,& You have a Major worry of Tsunami of Any size!It's like a Big Funnel,& Unfortunately,Crescent City is at The Small End of it!