![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRZk_1s0G84uyccD7KIaWdVPyiX9QaLZ3L33_9e6y9-CQURHqG0v7BjRBF2zHdWASDN8aoq-vI3o79UbMvEgn-DC-55_Dl8LVIiE-PtA2XXd-qioH4yqWMSlqfMAMYsygygYcA/s320/Foreshock.gif)
y-axis: Force (red) and acceleration (blue); x-axis: time (about 0.5 seconds per tick mark)
Unfortunately, nothing really showed any decent "aftershock" activity. It may be that the time interval I was measuring wasn't small enough. Or, the friction (strength) of the material was enough to avoid any noticeable aftershock behavior. I'll have to try using different "rough" substrates - perhaps I can generate aftershocks if my friction surface is sufficiently unstable. (Pea gravel, anyone?)
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