Hi Brett
 
     The tiltmeter has recorded 4 cycles over 11 hours.  The period is 
close to a world round trip for a surface wave. The odd thing is  that Samoa 
event was at 17:48:18 and is 140 degrees away in the quiet zone  relative to 
the UK .But the event was detected at 18:08:00 that is after only 20  minutes. 
The initial tiltmeter response occurs at exactly the same time. A  surface 
wave would take some 70 minutes to reach me. The initial part of  the 
tiltmeter trace shows a downward maximum at 30 minutes and then an upward  maximum 
at 2 hours and then it's an oscillation of about 2 hours 22 minutes for  3 
cycles.  I checked with BGS to confirm arrival times. It's an odd  one!
 
 
Martin





Hi Brett
 
     The tiltmeter has recorded 4 cycles over 11=
 hours.=20
The period is close to a world round trip for a surface wave. The odd thin=
g is=20
that Samoa event was at 17:48:18 and is 140 degrees away in the quiet=
 zone=20
relative to the UK .But the event was detected at 18:08:00 that is after=
 only 20=20
minutes. The initial tiltmeter response occurs at exactly the same time.&n=
bsp;A=20
surface wave would take some 70 minutes to reach me. The initial part=
 of=20
the tiltmeter trace shows a downward maximum at 30 minutes and then an upw=
ard=20
maximum at 2 hours and then it's an oscillation of about 2 hours 22 minute=
s for=20
3 cycles.  I checked with BGS to confirm arrival times. It's an=
 odd=20
one!
 
 
Martin