In a message dated 20/02/2006, jonfr500@......... writes:

This  earthquake has an energy component down to 2Hz and down to 1Hz, however 
i just  don't record that frequency (1Hz) that low good with my geophone. 
There also  appears to be some type of a fraction in the earthquake p and s 
waves. It  appears more in the p wave, but is also visible in the s wave. 


HI Jon,
 
    From the distance, this looks like a near regional  quake. Your geophone 
will see ~1/20 sensitivity at 1 Hz, 1/5 sensitivity at 2  Hz. If the waves are 
strong enough you can see them. You may also see two sets  of P & S waves 
which have travelled by different paths. There is a  discontinuity called the 
Moho about 35 km down under land, 10 km down under  the sea. The volcanic 
structures may interfere.
 
    Regards,
 
    Chris Chapman






In a message dated 20/02/2006, jonfr500@......... writes:
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  earthquake has an energy component down to 2Hz and down to 1Hz, however i=20=
just=20
  don't record that frequency (1Hz) that low good with my geophone. There al=
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  appears to be some type of a fraction in the earthquake p and s waves. It=20
  appears more in the p wave, but is also visible in the s wave.=20


HI Jon,
 
    From the distance, this looks like a near regio=
nal=20
quake. Your geophone will see ~1/20 sensitivity at 1 Hz, 1/5 sensitivity at=20=
2=20
Hz. If the waves are strong enough you can see them. You may also see two se=
ts=20
of P & S waves which have travelled by different paths. There is a=20
discontinuity called the Moho about 35 km down under land, 10 km down u=
nder=20
the sea. The volcanic structures may interfere.
 
    Regards,
 
    Chris Chapman