When downloading events through IRIS =AD Wilber II, I noticed that they liste=
d
the signal to noise ratio.  Most of the time the number was =AD1; however,
there were other numbers listed.  I have some questions and hopefully
someone can answer them.


1.  What is the significance of signal to noise ratio when looking at
earthquakes?

2.  How is signal to noise ratio computed?

3.  What are the ideal numbers to look for and at what point does the data
become unusable?

Thanks

Bob Hancock







When =
downloading events through IRIS – Wilber II, I noticed that they liste=
d the signal to noise ratio.  Most of the time the number was –1;=
 however, there were other numbers listed.  I have some questions and h=
opefully someone can answer them.





1.  What is the significance of signal to noise ratio when looking at =
earthquakes?



2.  How is signal to noise ratio computed?



3.  What are the ideal numbers to look for and at what point does the =
data become unusable?



Thanks



Bob Hancock