PSN-L Email List Message

Subject: Re: Recording Micro Quakes
From: ChrisAtUpw@.......
Date: Sun, 19 Feb 2006 11:07:29 EST


=20
In a message dated 19/02/2006, 1goss@........... writes:

Thanks  for all the reply=E2=80=99s. I don=E2=80=99t have 3,000 for a geopho=
ne laying=20
around, so I  will shorten the period on one of my Lehman=E2=80=99s to see h=
ow well It can=20
record  local events.=20
Thanks again Bryan S Goss



Hi Bryan,
=20
    No! This is not necessary and it will actually  REDUCE the output, since=
=20
you will have to increase the damping. For local events  you need to look at=
 P=20
& S freqencies well over 1 Hz. I expect that your  amplifier will roll off a=
t=20
10 Hz. Just use Winquake to set the upper and lower  frequencies displayed.
=20
    Regards,
=20
    Chris Chapman





In a message dated 19/02/2006, 1goss@........... writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Thanks=20 for all the reply=E2=80=99s. I don=E2=80=99t have 3,000 for a geophone lay= ing around, so I=20 will shorten the period on one of my Lehman=E2=80=99s to see how well It c= an record=20 local events.
  Thanks again Bryan S Goss
=
Hi Bryan,
 
    No! This is not necessary and it will actually=20 REDUCE the output, since you will have to increase the damping. For local ev= ents=20 you need to look at P & S freqencies well over 1 Hz. I expect that your=20 amplifier will roll off at 10 Hz. Just use Winquake to set the upper and low= er=20 frequencies displayed.
 
    Regards,
 
    Chris Chapman

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