Er, Japan isn't sinking. No more than Mt. Everest is "sinking". Japan is the top of an oceanic mountain range thrust up by plate subduction - so there are actually two continental plates that it's sitting on top of. Well, three actually, Japan sits on the North American and Eurasian plates, with the Filipino and Pacific plates being subducted under them. The actual landmass has been around for at least two billion years judging by the oldest known rocks found on the islands, and it's the aforementioned subduction zones which warped and distorted the coastline into what it is today as the pacific, philipino, etc, plates were jammed up underneith it starting at about 400mya during the Silurian period.
Japan is not going anywhere, and the only chance it seems to have of being submerged is if either some colossal caldera forms just underneith it (unlikely) and blows, or if sea levels rise. California is not "slipping into the ocean" either. The Midwest and Gulf of Mexico is going to be spending more time underwater than either of those two areas anytime soon.
But Iceland IS being torn in half by the Mid-Atlantic Ridge at the rate of a few centimeters per year.
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