PSN-L Email List Message

Subject: Re: Shackleford-Gundersen Seismometer, is it long period ?
From: ChrisAtUpw@.......
Date: Tue, 7 Feb 2006 12:30:00 EST


 
In a message dated 07/02/2006, jonfr500@......... writes:

Is the  Shackleford-Gundersen Seismometer long period seismometer or
short period  seismometer. I was looking at the info on the psn page
regarding this  seismometer.


Hi Jon,
 
    It is a long period seismometer with a second  channel high frequency 
output. You start with a vertical pendulum of maybe 1 sec  period and extend the 
period using a linear distance transducer and electronic  force feedback. See 
_http://psn.quake.net/freqtest.html_ (http://psn.quake.net/freqtest.html)  
Being  a vertical pendulum, it does not have the precision tilt setup 
requirements of a  Lehman. It is also physically smaller.
 
    Regards,
 
    Chris Chapman





In a message dated 07/02/2006, jonfr500@......... writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Is the=20 Shackleford-Gundersen Seismometer long period seismometer or
short peri= od=20 seismometer. I was looking at the info on the psn page
regarding this=20 seismometer.
Hi Jon,
 
    It is a long period seismometer with a second=20 channel high frequency output. You start with a vertical pendulum of maybe 1= sec=20 period and extend the period using a linear distance transducer and electron= ic=20 force feedback. See http://psn.quake.net/freqtest.ht= ml Being=20 a vertical pendulum, it does not have the precision tilt setup requirements=20= of a=20 Lehman. It is also physically smaller.
 
    Regards,
 
    Chris Chapman

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