Is the term WIWO .... Walk 
In   Walk Out
A common term used by seismologists to define the the trace on a 
seismogram where something has caused the seismometer to tilt to one 
side and then back...
as when someone has walked up to the seismometer and then walked away.

Or is it simply a term invented by Steve Hammond of Aptos?

Jan in Gilroy




  


Is the term WIWO....
Walk In   Walk Out 

A common term used by seismologists to define the the trace on a
seismogram where something has caused the seismometer to tilt to one
side and then back... 

as when someone has walked up to the seismometer and then walked away.



Or is it simply a term invented by Steve Hammond of Aptos? 



Jan in Gilroy