PSN-group--FYI -- The September issue of Physics Today has an article on =
Glacial Earthquakes observed in Greenland.  As you know glacers are big =
things--kilometers in size and massive.  As they flow slowly, and faster =
at times, long period waves are predominate--probably beyond what most =
amateur seismology stations copy.  The Columbia Un. team found =
magnitudes--usually low--M2-3, but as high as 4.6-5.1.

Of course large chunks of glaciers breaking off (calving) send shorter =
period shockwaves outward for--at times for several hundred miles.  I =
don'tt know, but I would suspect the signature of these events would be =
different--as shock waves in water are transferred to solid earth below. =
=20
   If your PSN station is in range of glacier territory, you may find =
glacial activity as part of your background noise!!.







PSN-group--FYI -- The September issue =
of Physics=20
Today has an article on Glacial Earthquakes observed in =
Greenland.  As=20
you know glacers are big things--kilometers in size and massive.  =
As=20
they flow slowly, and faster at times, long period waves are=20
predominate--probably beyond what most amateur seismology stations =
copy. =20
The Columbia Un. team found magnitudes--usually low--M2-3, but as high =
as=20
4.6-5.1.
 
Of course large chunks of glaciers =
breaking off=20
(calving) send shorter period shockwaves outward for--at times for =
several=20
hundred miles.  I don'tt know, but I would suspect the signature of =
these=20
events would be different--as shock waves in water are transferred to =
solid=20
earth below.  
   If your PSN station is in =
range of=20
glacier territory, you may find glacial activity as part of your =
background=20
noise!!.
      Jim=20
Lehman