Tom=0AWhat I find works for me is to save the unfiltered data.=0A=A0=A0 - F=
or teleseismic events I "6 pole bandpass filter" between 0.03 hz and 0.7 hz=
.. I then "4 pole notch filter" between 0.08 hz and 0.4 hz to get rid of the=
 microseisms. I sometimes have to do it twice or maybe use 0.6 hz for the u=
pper limit depending on the event. I usually look for the higher frequency =
hump to be around 10% of the low end FFT magnitude.=0A=0A=A0=A0=A0 - For re=
gional events I use the same bandpass but on the notch I go from 0.1 hz and=
 0.4 hz. I find the event data is a little higher at the low end.=0A=A0=A0=
=A0 - For local events I bandpass between 0.5 hz and 10 hz. =0A=0A=A0I hope=
 it helps. I found it works for me.=0A=0ARegards=0ABarry=0Awww.seismicvault=
..com=0A=0A=0A=0A=0A________________________________=0A From: Thomas Dick =0ATo: PSN list  =0ASent: Friday,=
 September 27, 2013 12:01 PM=0ASubject: Data filtering within WinQuake/WinS=
DR=0A =0A=0AI need some help. I've trying to solve this for over a year now=
..=A0 If you look at Bob's (Locust Valley) and my post ( Evansville) for the=
 Acari Peru=A0  quake on 9/25/13 -- in the data operations under Display/Mo=
dify -- Bob does 3 manipulations and I do five. I understand the first whic=
h is done within WinSDR=A0 but what is wrong with what I am doing within Wi=
nQuake?=0A=0AAdditional comments on this area might help me too. My units d=
etect frequencies between .008 Hz and up to 1 Hz on teleseismic quakes and =
higher up on regional events. I set WinSDr at Low Pass at 3 Hz-- should/cou=
ld this be lower --- I assume this means I am cutting off frequencies above=
 3 HZ with this filter, Strong ocean and Great Lake storms require me to cu=
t off sometimes at or above . 04 Hz. The words Low pass cutoff and High pas=
s cutoff as applied to=A0 my location situation seem confusing=0A=0AI know =
some of the pruists want data that is unfiltered. For me I just want to see=
 the finished product.=0A=0A_______________________________________________=
___________=0A=0APublic Seismic Network Mailing List (PSNLIST)=0A=0ATo leav=
e this list email PSNLIST-REQUEST@.............. with the body of the messa=
ge (first line only): unsubscribe=0ASee http://www.seismicnet.com/maillist.=
Tom
What I find wo=
rks for me is to save the unfiltered data.
   - For teleseismi=
c events I "6 pole bandpass filter" between 0.03 hz and 0.7 hz. I then "4 p=
ole notch filter" between 0.08 hz and 0.4 hz to get rid of the microseisms.=
 I sometimes have to do it twice or maybe use 0.6 hz for the upper limit de=
pending on the event. I usually look for the higher frequency hump to be ar=
ound 10% of the low end FFT magnitude.
    - F=
or regional events I use the same bandpass but on the notch I go from 0.1 h=
z and 0.4 hz. I find the event data is a little higher at the low end.
    - For local events I bandpass
 between 0.5 hz and 10 hz. 
 I hope it helps. I f=
ound it works for me.
Regards
Barry
www.seismicvault.com

=

  
 
 
 
   Fr=
om: Thomas Dick <thomasdick@.......>
 To: PSN list <psnlist@..............>=
 
 Sent: Friday, Septem=
ber 27, 2013 12:01 PM
 Subject: Data filtering within WinQuake/WinSDR
  
 

=0AI need some help. I've trying to solve this fo=
r over a year now.  If you look at Bob's (Locust Valley) and my post (=
 Evansville) for the Acari Peru   quake on 9/25/13 -- in the data oper=
ations under Display/Modify -- Bob does 3 manipulations and I do five. I un=
derstand the first which is done within WinSDR  but what is wrong with=
 what I am doing within WinQuake?

Additional comments on this area m=
ight help me too. My units detect frequencies between .008 Hz and up to 1 H=
z on teleseismic quakes and higher up on regional events. I set WinSDr at L=
ow Pass at 3 Hz-- should/could this be lower --- I assume this means I am c=
utting off frequencies above 3 HZ with this filter, Strong ocean and Great =
Lake storms require me to cut off sometimes at or above . 04 Hz. The words =
Low pass cutoff and High pass cutoff as applied to  my location situat=
ion seem confusing

 I know some of the pruists want data that is unf=
iltered. For me I just
 want to see the finished product.

_________________________________=
_________________________

Public Seismic Network Mailing List (PSNLI=
ST)

To leave this list email PSNLIST-REQUES=
T@.............. with the body of the message (first line only): unsubs=
cribe
See http://www.seismicnet.com/maillist.html for more information.<=