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

-----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 ?

Hi Gary,

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.

Here is how a volcano tremor looks like on my system. This is filtered
at 2Hz.

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

The movement was most at E-W sensor. But I guess that is the direction
the magma was pushing when this earthquake did happen.

Regards,
J=F3n Fr=EDmann.

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

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