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Posted: **Wed Oct 10, 2012 2:47 pm**

Hi
I have a little problem, Can I calcolate Vs30 from a depth of -5m from ground level? whereas gpec8 calculate Vs30 from 0m (ground level)

thanks a lot

Posted: **Wed Oct 10, 2012 6:31 pm**

Would you mean a Vs[5-30] instead of a Vs[30]? gprofile that does this type of calculation does not implement such case. Maybe you can build of formula from Vs[30] and Vs[5]...?

Code: Select all

Vs[5-30]=(30*Vs[30]-5*Vs[5])/25

I decline all responsibility upon the usage of such formula, or simply Vs30. Use at your own risk.

Posted: **Thu Oct 11, 2012 11:02 am**

no, i need to calcolate Vs30 from -5m at -35m (as well as the italian law says) because the laying of foundation is placed at -5m

Posted: **Fri Oct 12, 2012 10:32 am**

You can use the same formula, replacing Vs[30] by Vs[35]:

Code: Select all

Vs[5-35]=(35*Vs[35]-5*Vs[5])/30

Vs[35] and Vs[5] are calculated with 'gpprofile' with option '-average-at'

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