PSN-L Email List Message

Subject: Re: Recording earthquakes from 3rd floor
From: "Glenn Durden" alfa@..................
Date: Tue, 25 Jan 2011 06:43:49 +1100

I'm on the third floor, and as you can see by the pictures on my website, 
the result is that you'll see all the big earthquakes easily.

But of course there is a huge amount of background noise.
Wind is the biggest issue.   Windy days can block out pretty much 
You'll also find that the floor probably isnt solid enough to rest a 
seismometer on.     The weight of a human is enough to register full scale 
deflection as the floor sags, when you move from one side of the room to the 
The best I could do is to lift the sensor box off the floor and press it up 
against the wall (in a corner) with the weight of some bricks.
If you've got the ability to measure it (with an inclinometer), you'll also 
see how much the building sways backward and forward through the course of 
the day and it heats up and cools down.

But as you say, its worth a try anyway.   You might have a more solid 
building than mine.



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