## Vs30 and VsZ

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luca1979
Posts: 2
Joined: Wed Oct 10, 2012 1:06 pm

### Vs30 and VsZ

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
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### Re: Vs30 and VsZ

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.
luca1979
Posts: 2
Joined: Wed Oct 10, 2012 1:06 pm

### Re: Vs30 and VsZ

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