Hi Bob-
Well I have been doing geophysics for almost 50 years now & seldom do yo=
u get something for nothing- =
But indeed your filter does do that- I have been playing with it for a=
lmost a year now & it takes a $100 Mark Products (MP) geophone L15B (4.5=
Hz) & makes it look like a ~$2,000 MP L4 (1Hz) sensor.
If one integrates your posted Velocity grams- It is even more impressive=
! Integration is a LP filter so it is easier to compare the 2 records a=
nd you now see the ground motion (displacement). Which is another PLUS =
for Larry=92s WinQuake?
You can see the site effects from that Mud flat you live on in Long Island compared to the PAL site. The Pal STS is probably in a =
nice seismic vault on hard rock.
BTW- Tell us about your sensor (Z) - it is not described in the record h=
eadings.
Thanks for a very useful algorithm/program- A Thing of Beauty!
<<<<< Jim
Jim O'Donnell =
Geological/Geophysical Consultant
GEOTECHNICAL APPLICATIONS
702.293.5664 geophysics@..........
702.281.9081 cell jimo17@........
-- "Robert McClure" wrote:
I hope at least some of you will examine my recent postings of the
Okhotsk event:
080705.022000.rem.psn * M7.7 8618km from Locust Valley, NY: SEA OF OKHOT=
SK
080705.022000.remz.psn * M7.7 8618km from Locust Valley, NY
[WQFiltered and raw]: SEA OF OKHOTSK
080705.022100.rempal.psn * M7.7 ch1 Locust Valley, NY, ch2 Palisades,
NY]: SEA OF OKHOTSK
The first event file is in my usual style, in which I use
WQFilter.exe to make my short-period sensors work like long-period
sensors.
The second event file shows the Z sensor waveform after filtering on
top, and the raw data as the bottom trace.
The third file is my processed Z data as the top trace, and the data
from nearby network station PAL on the bottom. You can see that my
data processing results in a waveform closely resembling that of a
professional network sensor, the STS-2.
The proper use of WQFilter can improve the performance of any
amateur sensor. It can make the natural period shorter or longer as
desired, and it can correct for under or over damping. All you need to
know is the natural period and damping of your sensor.
WQFilter can be downloaded from
http://bobmcclure90.googlepages.com/winsac
It operates on PSN Type 4 files.
Regards,
Bob
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
See http://www.seismicnet.com/maillist.html for more information.
Hi Bob-
Well =
I have been doing geophysics for almost 50 years now & seldom do you=
get something for nothing-
But indeed your filter does do that- I have been playing with it =
for almost a year now & it takes a $100 Mark Products (MP) geo=
phone L15B (4.5Hz) & makes it look like a ~$2,000 MP L4 (1Hz) sensor=
..
If one integrates your posted Velocity grams- It is even more i=
mpressive! Integration is=
a LP filter so it is easier to compare the 2 records and you now see th=
e ground motion (displacement). Which is another PLUS for Larry=92s WinQuake?
You can see the site effects from that Mud flat=
you live on in Long Island compared to the PAL site. The Pal STS is probably in a nice seismic vault on hard rock.
BTW- Tell us about your sensor (Z) - it is not described in the record=
headings.
Thanks for a very useful algorithm/program- A Thing of Beauty!
<<<&=
lt;< Jim
=
=
Jim O'Donnell
=
Geological/Geophysical Consultant
=
; GEOTECHNICA=
L APPLICATIONS
702.293.5664 geophysics@..........702.281.9081 cell jimo17@........
-- "Robert McClur=
e" <bobmcclure90@.........> wrote:
I hope at least some of you =
will examine my recent postings of the
Okhotsk event:
080705.0=
22000.rem.psn * M7.7 8618km from Locust Valley, NY: SEA OF OKHOTSK
08=
0705.022000.remz.psn * M7.7 8618km from Locust Valley, NY
[WQFiltered=
and raw]: SEA OF OKHOTSK
080705.022100.rempal.psn * M7.7 ch1 Locust =
Valley, NY, ch2 Palisades,
NY]: SEA OF OKHOTSK
The first event=
file is in my usual style, in which I use
WQFilter.exe to make my sh=
ort-period sensors work like long-period
sensors.
The se=
cond event file shows the Z sensor waveform after filtering on
top, a=
nd the raw data as the bottom trace.
The third file is my p=
rocessed Z data as the top trace, and the data
from nearby network st=
ation PAL on the bottom. You can see that my
data processing results =
in a waveform closely resembling that of a
professional network senso=
r, the STS-2.
The proper use of WQFilter can improve the pe=
rformance of any
amateur sensor. It can make the natural period short=
er or longer as
desired, and it can correct for under or over damping=
.. All you need to
know is the natural period and damping of your sens=
or.
WQFilter can be downloaded from
http://bob=
mcclure90.googlepages.com/winsac
It operates on PSN Type 4 =
files.
Regards,
Bob
___________________________________=
_______________________
Public Seismic Network Mailing List (PSN-=
L)
To leave this list email PSN-L-REQUEST@.............. with the body of the message (first line only): unsubscribe
See http://ww=
w.seismicnet.com/maillist.html for more information.