[time-nuts] Freestanding mast

Magnus Danielson magnus at rubidium.dyndns.org
Tue Sep 7 07:49:59 UTC 2010


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...


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