Mark E. Skeels wrote...

>I was thinking to build a vibration sensor using a MSP430 (sorry PICers)
>and one of AD's accelerometer chips, to log the disturbance.

>Does anyone have any idea what kind of G range something like that 
>should measure?

It doesn't sound like the ground movement can't be very strong,
not if you're sleeping through it.

I can't speak with any authority, but IIRC the ground
accelerations in an earthquake strong enough to cause major
building damage are in the order of a few tenths of a g or
thereabouts.

Just for reference, a sinusoidal acceleration of 1 g peak
amplitude at a frequency of 1 Hz produces a peak-to-peak
displacement of 19.56 inches.  At a given g level, displacement
varies inversely with the square of frequency.

Dave D.

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