Hello tchannel1,

I think it might be interesting to sum all three axis
possibly by some kind of vector math to
obtain a single signal.
I have never done this before but I know
for a fact the main signal most probably is not
in any of the three planes but some vector of all
three together.

Regards;
geoff

----- Original Message ----- 
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Sent: Saturday, June 30, 2007 06:07
Subject: Period


Hi All,  I just did a side by side comparison of an Earthquake recorded by a Vertical with a 2? second period and a Horz Pendulum 
with a 10? second period.  The different on this 6.7M at 10000km was very pronounced, showing all the advantages of the Horz.

However, using the Vertical, I record many more Earthquake, and smaller ones.  If the event is large, both sensors are impressive 
(to me).

In planning my next sensor, I need to pick a target period.   I already see the advantage of each.  What period might be the best 
target?   Or is it just better to pick one end of the spectrum and not the center?

Thanks, Ted 

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