Hi,

 

The reports of change to the earth axis pose a question.  If we presume the
change is caused by a shift of mass about the axis, in this case a bulge
near Japan, then the shift should have occurred world wide in a very short
time frame due to centrifugal effects.  Has anyone seen the effect on a
vertical record?  The reason I ask is that if I integrate my record, just
over one minute after the P arrival I have an abrupt vertical offset lasting
for 2 seconds which then recedes smoothly over a couple hours.   When I saw
it I assumed a friction error but I have now looked at some other records
and don't see comparable affects.  Also the fact that it is over a minute
after shaking begins would seem to have given stiction time to have
released.   

 

Randy

















 

Hi,

 

The reports of change to the earth axis pose a
question.  If we presume the change is caused by a shift of mass =
about the
axis, in this case a bulge near Japan,
then the shift should have occurred world wide in a very short time =
frame due
to centrifugal effects.  Has anyone seen the effect on a vertical =
record? 
The reason I ask is that if I integrate my record, just over one minute =
after
the P arrival I have an abrupt vertical offset lasting for 2 seconds =
which then
recedes smoothly over a couple hours.   When I saw it I =
assumed a
friction error but I have now looked at some other records and =
don’t see comparable
affects.  Also the fact that it is over a minute after shaking =
begins
would seem to have given stiction time to have released. =
  

 

Randy