i know a mega tsunami is gonna hit the coast in nine hours:

first thing i'd do is empty my checking and savings accounts in case the bank systems were affected. Then i'd buy as much gas as i could store before the PPG goes through the roof, as it usually does whenever it so much as rains hard. A tsunami wiping out even a few major ports is definitely gonna affect the flow of oil into the country. Next i'd stock up on fresh meat and produce, as most of what we eat in this country is imported, and anything that's not homegrown is likely to cost an arm and a leg very soon.

those are the only things that immediately come to mind when i think of the coast getting decimated. fresh foods, gas, and maybe money. I live far enough inland that unless the building of an arc is necessary, my area won't be directly affected.

ETA: forgot about batteries. IDK, but i doubt most of the batteries we use are made here.