Jon,
Yes I'm testing the seismometer without the case, it is now exposed to =
the
open air and any changes in the atmospheric pressure, I thought it would
calm down by now. I wanted plots with and without the pressure case.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Monday, February 22, 2010 5:40 PM
To: psn-l@..............
Subject: RE: No intrest in earthquakes ?

Hi Gary,

Are you testing your seismometer for something special ? I do see the
response on your plot. It is as one would expect from a sensivite
instrument like the one you have.

At ~482km distance from a volcano you won't record any of the harmonic
tremors the volcano can make. But you might see earthquakes from the
volcano if it makes a Mb5.0 happen.

Regards,
J=F3n Fr=EDmann.

On m=E1n, 2010-02-22 at 17:31 -0800, Gary Lindgren wrote:
> Jon,
> The nearest volcano is probably 300 miles away. The case is excellent. =
A
few
> minutes ago I remove the cover in order to record the response without =
the
> cover and open to the atmosphere. It's going to take awhile for the =
unit
to
> calm down.
> Gary
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.............. =
[mailto:psn-l-request@...............
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Monday, February 22, 2010 4:57 PM
> To: psn-l@..............
> Subject: RE: No intrest in earthquakes ?
>=20
> Hi Gary,
>=20
> Thanks for the link. This is quite intresting. Are you near any =
volcano
> in CA, USA ?
>=20
> You must record some local earthquake near you. How is your sensor
> working out in those cases ?
>=20
> Regards,
> J=F3n Fr=EDmann.
>=20
> On m=E1n, 2010-02-22 at 16:06 -0800, Gary Lindgren wrote:
> > Jon,
> > Today I detected the Tonga M6.0 and M5.3 quakes, 77 degrees away. =
And
the
> > Kermandec Islands M5.2, 82 degrees away. I filter Low pass .08Hz and
high
> > pass .02Hz.
> > With the filters I'm using I'm looking for the long range quakes. =
The
> > seismometer has a flat response from 100 seconds to 20Hz. See
> > http://www.blue-eagle-technologies.com/seismo1.html The data is =
updated
> > every 10 minutes.=20
> > Gary
> >=20
> >=20
> > =20
> >=20
> > -----Original Message-----
> > From: psn-l-request@.............. =
[mailto:psn-l-request@...............
> On
> > Behalf Of J=F3n Fr=EDmann
> > Sent: Monday, February 22, 2010 3:43 PM
> > To: psn-l@..............
> > Subject: RE: No intrest in earthquakes ?
> >=20
> > Hi Gary,
> >=20
> > Isn't the FBV seismometer a low frequency seismometer. I am sure =
that is
> > why you are detecting earthquakes from the South Pacific. What is =
the
> > absolute minimal size that you can detect ? With my 4.5Hz =
seismometer I
> > can go down to ML0.01 when weather is good.
> >=20
> > Here is how a volcano tremor looks like on my system. This is =
filtered
> > at 2Hz.
> >=20
> >
>
http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hkbz=
..ps
> > n
> >
>
http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hkbn=
..ps
> > n
> >
>
http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hkbe=
..ps
> > n
> >=20
> > The movement was most at E-W sensor. But I guess that is the =
direction
> > the magma was pushing when this earthquake did happen.
> >=20
> > Regards,
> > J=F3n Fr=EDmann.
> >=20
> > On m=E1n, 2010-02-22 at 15:19 -0800, Gary Lindgren wrote:
> > > Jon,
> > > I'm sorry we don't have enough discussions on earthquakes. I'll =
start
> > here.
> > > I have a FBV seismometer built along the design of Dave Nelson and
Brett
> > > Nordgren. It is extremely sensitive. I live in California and =
notice
> that
> > > most of the earthquakes I see are in the South Pacific. Is this =
the
hot
> > area
> > > around the world or am I seeing them because I have the open ocean
from
> my
> > > location.
> > > Gary
> > >=20
> > >=20
> > >=20
> > >=20
> > > -----Original Message-----
> > > From: psn-l-request@..............
[mailto:psn-l-request@...............
> > On
> > > Behalf Of J=F3n Fr=EDmann
> > > Sent: Monday, February 22, 2010 2:40 PM
> > > To: PSN-Postlist
> > > Subject: No intrest in earthquakes ?
> > >=20
> > > Hi all,
> > >=20
> > > I often see here technical discussion about seismometers and =
geophones
> > > here. But what I don't see are disscusions about earthquakes, and =
even
> > > volcanoes.=20
> > >=20
> > > Can someone explain to me why that is. I am recording earthquakes
> > > because I have intrest in them.
> > >=20
> > > Regards,=20
> >=20
> > __________________________________________________________
> >=20
> > Public Seismic Network Mailing List (PSN-L)
> >=20
> > To leave this list email PSN-L-REQUEST@.............. with=20
> > the body of the message (first line only): unsubscribe
> > See http://www.seismicnet.com/maillist.html for more information.
> >=20
> >=20
> > __________________________________________________________
> >=20
> > Public Seismic Network Mailing List (PSN-L)
> >=20
> > To leave this list email PSN-L-REQUEST@.............. with=20
> > the body of the message (first line only): unsubscribe
> > See http://www.seismicnet.com/maillist.html for more information.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>=20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
--=20
J=F3n Fr=EDmann J=F3nsson

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