Hi Jeff,
               the primary reason is that it was a deep quake ... 211km
it is relatively rare for quakes that deep and deeper to produce aftershocks


cheers
Dave
Sydney

At 05:22 AM 15/08/2010, you wrote:
>Hello All,
>
>I am just new to this "sport" of seismology and been having lots of fun 
>watching earthquakes
>on my seismometer come in from places near and far. I noticed that there 
>have not been any
>aftershocks from the M7.1 quake in Ecuador on Aug 12.
>
>All of the other large quakes that I have seen since I started watching 
>quakes in the spring
>have after shocks. Look at the Baja California quake from April, it is 
>still having after shocks
>from that one. The one in the Mariana Island region form yesterday has 
>already had
>numerous after shocks and a M6.3 just a litlle while ago.
>
>Can someone out there tell me what the difference in this quake is that 
>there have not been
>after shocks compared to a "normal" quake with after shocks?
>
>Thanks,
>
>Jeff Zambory
>JZAB Calgary AB
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