PSN-L Email List Message

Subject: Re: Guatemala earthquake
From: Angel sismos@..............
Date: Wed, 13 Jun 2007 23:33:30 +0000

Hello J=F3n,

Congrats on your lehman!

From=20my experiences a lehman like that would wander all over
the place if you did not put in a box.  The drafts and air currents
would drive it loco.

I suspect that main reason your lehman is deaf is that heavy cable
coming off the coil, I bet it renders the boom motionless.

I also agree with other who say the upright is too weak and that the
upper pivot is just as important as the lower one.

I also made my first lehamn HUGE and it was less better that the very
smaller ones I made.  My first one was over a meter long with a BIG

BTW here is what I reported 5 minutes after the event, I nailed it!



Wednesday, June 13, 2007, 8:51:17 PM, you wrote:

> Hi all

> Emsc did report a mw 6.9 earthquake offshore Guatemala. But for some
> strange reason I don't think I did record that earthquake on my test
> lehman type seismometer. However I did see it on my geophone, but mostly
> on the Z axis for some reason, but not so clear on N-S axis and E-W
> axis.

> Any ideas why I might not have recorded the Mw 6.9 earthquake on my test
> lehman sensor. Besides the obivus flaws in it.

> Regards.

Best regards,


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