There is a new Code Central program available with up to date spectral values and maps - it supports different codes and reduces the confusion.
The program is called "Java Ground Motion Parameter Calculator – Version 5.0.6" and it can be downloaded at the following site:
http://earthquake.usgs.gov/research/hazmaps/design/#install_java
You will need to download Java Runtime Environment and its ActiveX controller if you don't have them on your computer.
Ashwin Ranga Swamy, P.E.
Los Angeles, California
----- Original Message -----
From: "Mark Johnson" <markajohn@yahoo.com>
To: <seaint@seaint.org>
Sent: Monday, July 16, 2007 10:21 AM
Subject: Re: Spectral Acceleration using 2006 IBC
>
> Please say more, maybe URLs to use.
>
> Thanks,
> Mark
>
> ***original message***
>>Be carful in how you use the USGS web site. If you
> get to the right location it explicitly states that
> the values are for the 2006 IBC. I initially used one
> of the other options and got different accelerations.
> If you are using the USGS website correctly you never
> even have to think about whether it is 10% or 2<
>
>
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