It's hard to imagine how those areas could possibly be affected.
Tsunami's travel a straight line, no?
No, they will bend around obstacles. Think of a rock in a pond, it creates a ring right, so it expands in a arc. When it comes upon shallow water it rises up, the water has to go somewhere. As it “hits” land the wave around that land slows down, making the wave appear to bend, and then it reflects back off of the land shelf. Think of a pylon in a pond, that wave hits the pylon, wraps around and reflects back off of it all at the same time.
To give you an idea...go to youtube and search 1960 Chile Tsunami...one of the links is a simulation showing wave travel from that earthquake.
Scarey stuff.
No. Wave propagation causes waves to affectively bend. Look at the damage done on the West coast of Sri Lanka.