Hello Jim,

An FMES is a bunch of plumbing filled with water.  Well, that is a bit over
simplified but no too much.  Fluid Mass Electrolytic Seismometer. Once
you have the knack of it you can make one in just a few hours, not
counting the electronics. With just your left hand it might take you a
bit longer.

Basically two transducer about a meter apart joined by some tubing so
the electrolytic fluid (water and antifreeze) find a level within the
transducers. The transducers form part of a sensitive resistive bridge
which senses the motion of the fluid. Like I said this is over
simplified but not by far.

There is a yahoo group that chats now and then on building them and
trading ideas, you can see some photos at the groups site:

http://groups.yahoo.com/group/fmes/

Dave Nelson is the creator of FMES and he might pipe (no pun intended)
in and say a bit more. Dave might have some more current pictures.

angel



Saturday, April 22, 2006, 11:09:06 AM, you wrote:

> what is a FMES-????
> I broke my right hand so am typing left-handed...jim

> -- Angel  wrote:
> Hi All,

> Here is a jpeg of how the Siberia 7.7 (or 7.6) looked like here in
> Panama on a 1 meter long FMES oriented N/S with a 24 bit digitizer.

> http://www.volcanbaru.com/quakes/FMES_Siberia_7-7.jpg

> Each line is 30 minutes long.

> FMES's are easy to build and are great for tele-seismic stuff and
> pretty good for the local events also.

> regards,

> Angel





> Saturday, April 22, 2006, 9:13:49 AM, you wrote:

>> Hi

>> I did clean the file of any frequnacy above 1Hz, becose of local noise
>> that was in the recording on higer frequancyes.

>> I was not expecting that to be able to detect earthquake at this
>> distance. Since my geophone is short period and not ment for this type
>> of event at this distnace. I know that I can detect earthquakes that are
>> at the distance of ~860km and around size mag 4.6 - 5.0 at that range.

>> So far, emsc-csem says the earthquake is 7.7Mw.

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-- 
Best regards,
 Angel

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