A tide gage record
from Kungsholmsfort
in southern Sweden.
Built on the
proterozoic bedrock
of the Baltic Shield,
one of the most
tectonically stable
areas on Earth.
Like all of Northern Europe
Kungsholmsfort is
still isostatically rising
after the last glaciation.
When the gauge
was built in 1886
it happened to be
situated exactly
on the line
where sea-level rise
(1.5 mm/year)
and isostatic rise
(1.5 mm/year)
were equal,
resulting in a static
relative sea level.