Many thanks to all who responded to my qs about concrete piers - 
Dewayne, Steve, Meredith & John.  Much appreciated.  I'm building a 
house extension in the next few months and will have some latitude in 
installing a pier.  The soil is clay like and the bedrock is a long way 
down.  So I'll dig as deep as I can afford and work by the many 
suggestions in the emails received.

The good news is that my house is in the middle of a farm and the 
nearest (really quiet) road is over half a mile away.  So if I get the 
pier right, I should get some good results.  Of course, the extension 
will keep me busy for a while before I can turn to the seismo.

Thanks

Ian Smith

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