CA State Dept of Conservation Tsunami Inundation Maps
The latest maps are downloadable from the CA Conservation site. Shows which areas of the California Coastline are at risk should a tsunami occur.
Link below is to the San Mateo County main map where you can click on a specific quadrangle to see the vulnerable areas.
http://www.conservation.ca.gov/cgs/geologic_hazards/Tsunami/Inundation_Maps/SanMateo/Pages/SanMateo.aspx