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Re: Earthquake

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It seems that USGS was able to map the various areas of the states to get a better picture of the frequency of seismic events.  Though the values may be lower, more typical structures will be subject to stricter design and detailing requirements.  97 UBC was better in detailing requirements because soil parameters became more critical.  however, seismic Zones 1 through 4 still existed without regard to MCE. 

On Thu, Feb 21, 2008 at 11:13 AM, <ECVAl3(--nospam--at)> wrote:
If a 6.0 is common and we have been somewhat successful at minimizing structural damage with the 1997 UBC, why do the 2006 IBC results for Seismic forces seem to come out with lower values?

David Topete, SE