From: Ad 

http://www.theregister.co.uk/2007/05/14/ice_ghost/

"Canadian researchers have found a gravitational shadow hanging over
North America, left over from the last ice age. The work is published in
the May 11 edition of the journal Science.

Using four years of data from the Gravity Recovery and Climate Experiment
(GRACE) satellite mission – a pair of satellites that are measuring the
Earth’s gravitational field to determine how mass is being redistributed on
the planet - the scientists were able to construct an image of the
long-vanished Laurentide ice sheet.

Professor Jerry Mitrovica, of the U of T and one of the paper's authors,
describes the phenomenon as "the ghost of the ice age" that still
hangs over the continent.

This was a truly massive ice sheet. It had two enormous domes one east and
the other west of the Hudson Bay area. When it receded, global sea levels
went up about sixty metres. Its immense weight actually compressed the
Earth's crust.

"These are parts of the crust that haven’t completely rebounded from
the giant depression caused by the ice," explains Dr. Mark Tamisiea,
of the Harvard-Smithsonian Center for Astrophysics."


So.....given most land wotz been compressed down into the mantle is now on
the rise (e.g. scandanavia ).....looks like as the sea lvels rise....so
will the northern chunks of North America/Canada......


e.g.

http://www.homepage.montana.edu/~geol445/hyperglac/isostasy1/

"Evidence of Isostatic Rebound

In areas formerly covered by ice sheets (around the Baltic Sea and Hudson
Bay, for example), sea cliffs and beach ridges are now found nearly 300 m
(1000 feet) above sea level!  14C ages on marine shells and driftwood show
that these features are postglacial (less than 14,000 years old).  They
were formed at sea level and, even though eustatic sea level has risen,
they have risen far more from isostasy."

"Where rebound is well constrained by 14C ages, it usually occurs at
an exponentially declining rate.  The half-recovery time is commonly
several thousand years, thus recovery is still continuing around the Baltic
Sea and Hudson Bay, albeit much more slowly than it did immediately
following deglaciation.  [Watch the animation at top carefully!]  Seaports
of hundreds of years ago may now be several kilometers inland and meters
above sea level!"


So....if global warming takes place then.....build where there was Ice
sheets 10K years ago & you should be fine....


Adam

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