I expect that tectonic changes, subductions and the like occur much more slowly than the melting of ice when an inter-glacial period occurs. Here is a chart about sea levels rising since the last glacial maximum about 21,000 years ago.
It shows a sea level rise of about 120 meters from then until now. That is a rise of about .175 mm per year. When you factor in differing rates of melt over the centuries, which is reflected in the so-called "meltwater pulse" about 15,000 years ago, that is relatively close to the 1.0 mm per year rise in sea levels Dr. Morner states as a "certainty" between 1850 to 1930-40. He then states that there was no rise from then until 1970. That would help average it out to a figure much closer to .175 mm per year for a 120 year period putting the last century's rise right in line with the average since this inter-glacial began.
If you look at sea levels over a much longer period of time our current sea level is at a near all time low and has been trending down, with a geologically recent uptick a few hundred thousand years ago, that reversed again, for the last 60 million years.
