Hi Jon
     S-T Morrissey sent PSN an email on 13 nov 1999 which had an equation relating magnitude,amplitude, period and distance. I made a log-log plot of this, the x-axis was distance (km) the y-axis was counts. Each line was one magnitude. It was then interesting to plot my events on this sheet to see how they co-related. The problem I see is one of  sensor gain and a/d converter. If you increase the gain to get more distant events then you clip a larger event that may come. I think a higher count a/d with lower gain would give a larger event magnitude range but I'm not sure where the noise begins to enter the picture. this will depent on the electronics & site.
  regards
  Barry
   
  regards
  Barry

Jón Frímann  wrote:
  Hi all

With long period seismonitor what is the smallest earthquake that can be
detected with such seismonitor ? Then i mean in teleseismic earthquake
range.

Regards.
-- 
Jón Frímann Jónsson
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/

__________________________________________________________
Hi Jon
  
   S-T Morrissey sent PSN an email on 13 nov 1999 which had an equation relating magnitude,amplitude, period and distance. I made a log-log plot of this, the x-axis was distance (km) the y-axis was counts. Each line was one magnitude. It was then interesting to plot my events on this sheet to see how they co-related. The problem I see is one of  sensor gain and a/d converter. If you increase the gain to get more distant events then you clip a larger event that may come. I think a higher count a/d with lower gain would give a larger event magnitude range but I'm not sure where the noise begins to enter the picture. this will depent on the electronics & site.
  
regards
  
Barry
  
 
  
regards
  
Barry

Jón Frímann <jonfr500@.........> wrote:
  
Hi