Hi Ian,

How did the harmonic tremor show up on 4.5Hz geophone ? I now have clues
what to look for because of the volcano earthquake on the 20.02.2010.
But I am yet to record a harmonic tremor.

Regards,
J=F3n Fr=EDmann.

On =FEri, 2010-02-23 at 16:32 +0000, ian wrote:
> I use to live 20 miles from the volcano park.  I too have had the lava=20
> at my feet but with a relaxed ranger!  It was very slow flowing.
>=20
> I used to monitor the daily acrobatics of the volcanoes with my 4.5 Hz=20
> geophone.  I assume Tony is still in nearby Kona.
>=20
> Cheers
>=20
> Ian
>=20
> Gary Lindgren wrote:
> > Hi Jon,
> > I want to get a good clean display and will need another 12 hours and t=
hen
> > I'll put the cover back on. With you interest in volcanoes, have you ev=
er
> > been to Hawaii and up to Volcanoes National Park and watched the erupti=
ons.
> > They also have a nice earthquake research station there too. The lava i=
s
> > usually flowing. A few years ago I was at the area with lava flowing an=
d was
> > there before sunrise and before the ranger was there and was able to se=
e
> > lava flow at my feet, really. It was all very safe.
> > Gary
> >
> >
> >  =20
> >
> > -----Original Message-----
> > From: psn-l-request@.............. [mailto:psn-l-request@...............
] On
> > Behalf Of J=F3n Fr=EDmann
> > Sent: Tuesday, February 23, 2010 7:26 AM
> > To: psn-l@..............
> > Subject: RE: No intrest in earthquakes ?
> >
> > Hi Gary,
> >
> > Did you get the resaults from it that you did want ?
> >
> > Regards,
> > J=F3n Fr=EDmann.
> >
> > On m=E1n, 2010-02-22 at 18:06 -0800, Gary Lindgren wrote:
> >  =20
> >> 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 wou=
ld
> >> calm down by now. I wanted plots with and without the pressure case.
> >> Gary
> >>
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: psn-l-request@.............. [mailto:psn-l-request@..............
m]
> >>    =20
> > On
> >  =20
> >> 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:
> >>    =20
> >>> Jon,
> >>> The nearest volcano is probably 300 miles away. The case is excellent=
.. A
> >>>      =20
> >> few
> >>    =20
> >>> minutes ago I remove the cover in order to record the response withou=
t
> >>>      =20
> > the
> >  =20
> >>> cover and open to the atmosphere. It's going to take awhile for the u=
nit
> >>>      =20
> >> to
> >>    =20
> >>> calm down.
> >>> Gary
> >>>
> >>>
> >>>
> >>>
> >>> -----Original Message-----
> >>> From: psn-l-request@.............. [mailto:psn-l-request@.............
om]
> >>>      =20
> >> On
> >>    =20
> >>> Behalf Of J=F3n Fr=EDmann
> >>> Sent: Monday, February 22, 2010 4:57 PM
> >>> To: psn-l@..............
> >>> Subject: RE: No intrest in earthquakes ?
> >>>
> >>> Hi Gary,
> >>>
> >>> Thanks for the link. This is quite intresting. Are you near any volca=
no
> >>> 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:
> >>>      =20
> >>>> Jon,
> >>>> Today I detected the Tonga M6.0 and M5.3 quakes, 77 degrees away. An=
d
> >>>>        =20
> >> the
> >>    =20
> >>>> Kermandec Islands M5.2, 82 degrees away. I filter Low pass .08Hz and
> >>>>        =20
> >> high
> >>    =20
> >>>> pass .02Hz.
> >>>> With the filters I'm using I'm looking for the long range quakes. Th=
e
> >>>> seismometer has a flat response from 100 seconds to 20Hz. See
> >>>> http://www.blue-eagle-technologies.com/seismo1.html The data is
> >>>>        =20
> > updated
> >  =20
> >>>> every 10 minutes.=20
> >>>> Gary
> >>>>
> >>>>
> >>>> =20
> >>>>
> >>>> -----Original Message-----
> >>>> From: psn-l-request@..............
> >>>>        =20
> > [mailto:psn-l-request@...............
> >  =20
> >>> On
> >>>      =20
> >>>> 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 tha=
t
> >>>>        =20
> > is
> >  =20
> >>>> why you are detecting earthquakes from the South Pacific. What is th=
e
> >>>> absolute minimal size that you can detect ? With my 4.5Hz seismomete=
r
> >>>>        =20
> > I
> >  =20
> >>>> can go down to ML0.01 when weather is good.
> >>>>
> >>>> Here is how a volcano tremor looks like on my system. This is filter=
ed
> >>>> at 2Hz.
> >>>>
> >>>>
> >>>>        =20
> > http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hk=
bz.ps
> >  =20
> >>>> n
> >>>>
> >>>>        =20
> > http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hk=
bn.ps
> >  =20
> >>>> n
> >>>>
> >>>>        =20
> > http://seismicnet.com/cgi-dos/makegif.exe?/quakes/1002/100220.180800.hk=
be.ps
> >  =20
> >>>> n
> >>>>
> >>>> The movement was most at E-W sensor. But I guess that is the directi=
on
> >>>> 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:
> >>>>        =20
> >>>>> Jon,
> >>>>> I'm sorry we don't have enough discussions on earthquakes. I'll
> >>>>>          =20
> > start
> >  =20
> >>>> here.
> >>>>        =20
> >>>>> I have a FBV seismometer built along the design of Dave Nelson and
> >>>>>          =20
> >> Brett
> >>    =20
> >>>>> Nordgren. It is extremely sensitive. I live in California and notic=
e
> >>>>>          =20
> >>> that
> >>>      =20
> >>>>> most of the earthquakes I see are in the South Pacific. Is this the
> >>>>>          =20
> >> hot
> >>    =20
> >>>> area
> >>>>        =20
> >>>>> around the world or am I seeing them because I have the open ocean
> >>>>>          =20
> >> from
> >>    =20
> >>> my
> >>>      =20
> >>>>> location.
> >>>>> Gary
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: psn-l-request@..............
> >>>>>          =20
> >> [mailto:psn-l-request@...............
> >>    =20
> >>>> On
> >>>>        =20
> >>>>> Behalf Of J=F3n Fr=EDmann
> >>>>> Sent: Monday, February 22, 2010 2:40 PM
> >>>>> To: PSN-Postlist
> >>>>> Subject: No intrest in earthquakes ?
> >>>>>
> >>>>> Hi all,
> >>>>>
> >>>>> I often see here technical discussion about seismometers and
> >>>>>          =20
> > geophones
> >  =20
> >>>>> here. But what I don't see are disscusions about earthquakes, and
> >>>>>          =20
> > even
> >  =20
> >>>>> volcanoes.=20
> >>>>>
> >>>>> Can someone explain to me why that is. I am recording earthquakes
> >>>>> because I have intrest in them.
> >>>>>
> >>>>> Regards,=20
> >>>>>          =20
> >>>> __________________________________________________________
> >>>>
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> >>>>
> >>>>
> >>>> __________________________________________________________
> >>>>
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> >>>
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> >
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>=20
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>=20
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