Hi Gary,

Thanks for the link. This is quite intresting. Are you near any volcano
in CA, USA ?

You must record some local earthquake near you. How is your sensor
working out in those cases ?

Regards,
J=F3n Fr=EDmann.

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 Bret=
t
> > Nordgren. It is extremely sensitive. I live in California and notice th=
at
> > 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
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