PSN-L Email List Message
Subject: Re: low pressure tilt?
From: ian ian@...........
Date: Mon, 10 Mar 2008 20:41:05 +0000
I think the "event" on the bottom line is a passing animal. It shows up
on the geophone trace underneath and it doesn't show at
http://www.guralp.net/aboutus/realtime . My sensors are in a double
skinned wooden box, surrounding the concrete pad, about a meter cubed,
with insulation in the 3" cavity all round, a "Kingspan" solid foam
insulation slab on top, then a tarp cover and a wooden lid on top of
that. Everything is warm and dry inside
The weather where I am has been average for this time of year. We have
been close to the centre of the depression most of the day. Some light
rain and winds of about 30 mph. The unusual thing is the record low
atmospheric pressure. Chris, though, is probably right, the simplest
explanation is usually the correct one...
> Hi Ian.
> You actually should record the ocean waves on your lechman in this type of
> storm. I don't how you protect your lechman outside, but in this type of
> storm not much is needed to break an weak setup. There is a earthquake
> recorded near the zero line at the bottom of the image. After that I see
> some weather noise as expected until it goes flat. So I must assume that
> something has happened to it. Maybe it got flooded by water or the cable
> got damged. It is hard to tell, you are going to have to look at it when
> the storm dies down.
> Jón Frímann.
>> we have a record breaking low pressure system over us in Scotland just
>> now, 952 mbar or about 28". My Lehman seems to have gone into limit,
>> given the flat line signal coming from it (see http://www.iasmith.com).
>> I wonder if the low pressure has caused the ground to tilt, ever so
>> I also wonder if it will come out of limit when the pressure goes up
>> again, though hysteresis will probably prevent it.
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