Hmm....40 miles in 8 or so hours....gridlock likely....I would throw my stuff on my touring bike and pedal away to high ground. It helps that high ground is much closer here on the left coast.

second option - rig the kayak for the ride of a life time! Don't forget the PFD and a helmet.

I believe I recall reading that the tsunami triggered by the 1969 Alaska earthquake clearcut the forest in one Alaskan fiord to a height of 1,000 above MSL. Probably not good conditions for the kayak....