Hi Bob,
 
  I was most interested in your surface wave comments.Here in England  local 
earth quakes are rare so most events detected are teleseismic.
 
I have a pendulum seismometer that resolves both X and Y axis components  
independently ( broadband 50 seconds ). If I plot the N-S verses E-W  components 
during the first few minutes of a teleseismic event one gets a form  that 
indicates the direction of arrival. The Svalbard event you mention shows a  form 
whose major axis is along the  NNW-SSE, consistent with it's  location relative 
to England. For the recent Tonga event M7.8, the X-Y  plot has a majors axis 
virtually north- south consistent with the  shortest path though China, 
Siberia and the north pole.
Inspection of the individual seismographs show an initial strong radial  
component relative to the transverse as would be expected.
 
The last local event was  2 years ago ( M 4.7 ) so I have to make the  most 
of teleseismic events!
 
 
Regards Martin  





Hi Bob,
 
  I was most interested in your surface wave comments.Here in Engl=
and=20
local earth quakes are rare so most events detected are teleseismic.
 
I have a pendulum seismometer that resolves both X and Y axis component=
s=20
independently ( broadband 50 seconds ). If I plot the N-S verses E-W=20
components during the first few minutes of a teleseismic event one gets a fo=
rm=20
that indicates the direction of arrival. The Svalbard event you mention show=
s a=20
form whose major axis is along the  NNW-SSE, consistent with it's=20
location relative to England. For the recent Tonga event M7.8, the=
 X-Y=20
plot has a majors axis virtually north- south consistent with the=20
shortest path though China, Siberia and the north pole.
Inspection of the individual seismographs show an initial strong radial=
=20
component relative to the transverse as would be expected.
 
The last local event was  2 years ago ( M 4.7 ) so I have to make=20=
the=20
most of teleseismic events!
 
 
Regards Martin