IANAS[1], but I believe one of the reasons why the Lituya Bay tsunami was so big was simply that the water had nowhere to go but up. In a more lowlandy situation the water would spread over much larger areas at a lower elevation. Also, considering Seattle's geographic position (away from the Pacific) I would be surprised if any big tsunami would hit Seattle directly.
A little bit of Googling found this[2]. The largest known tsunami to hit Seattle was 16ft, 1100 years ago.
That said, heading for the hills is probably a good choice anyway.
A little bit of Googling found this[2]. The largest known tsunami to hit Seattle was 16ft, 1100 years ago.
That said, heading for the hills is probably a good choice anyway.
[1] Seismologist
[2] http://www.seattle.gov/emergency-management/what-if/hazards/...