Steve,
On 09/07/2010 08:08 AM, Steve Rooke wrote:
Well, Steve has been experiencing a LOT of after-shocks, some of which
are still big enough to move things around and I found I had to grab
hold of my cup of tea to stop it shaking onto the floor last night. In
fact these after-shocks are still opening up new cracks in roads and
causing buildings to fall.
As for my height position, I have run a few surveys but I'm getting
varying readings and I wonder if the after-shocks are messing up the
survey results. The latest one which was during a fairly stable period
was 6.8 MSL.
The mast could have sunk a bit or even this whole area could have done
as I live on reclaimed marsh-land. My Mothers 3 year old house looks
like it has sunk a bit at one and and risen at the other, ie. it looks
like it has tipped slightly as her house is built on a concrete
pontoon.
It wouldn't surprise me if they adjust the height of MSL but I would
have thought they would have moved it the other way in an attempt to
forestall fears of the effects of Global Warming.
I keep wondering if you have not had a change in your multipath
environment. Multipath can cause biases like that...
If things have been dislocated a bit sideways and such, the vector sum
may be quite different...
Cheers,
Magnus
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