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RE: Seismic Zones in Texas

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Thanks.  That's exactly what I was looking for.

Tony Powers

> -----Original Message-----
> From:	Harold Sprague [SMTP:harold.sprague(--nospam--at)neenan.com]
> Sent:	Tuesday, January 05, 1999 9:51 AM
> To:	'seaint(--nospam--at)seaint.org'
> Subject:	RE: Seismic Zones in Texas
> 
> The IBC 2000 (which will soon be the only national building code in the
> US)will be using the 1997 NEHRP as its basis.  There will be no more
> "seismic zones".  The seismicity will be determined using seismic spectral
> ordinates.  Check out the USGS site at http://geohazards.cr.usgs.gov/eq/.
> 
> You will note in the left hand column under "Seismic Hazard" a listing for
> Hazard by Zip Code and another listing for Hazard by Lat/Lon.  Use these
> to
> determine the seismicity of the site and question.  Then follow along in
> the
> 1997 NEHRP to see what provisions apply.  
> 
> Regards,
> Harold Sprague
> The Neenan Company
> harold.sprague(--nospam--at)neenan.com
> 
> 
> -----Original Message-----
> From: Powers, Tony [mailto:tpowers(--nospam--at)hdrinc.com]
> Sent: Tuesday, January 05, 1999 10:18 AM
> To: 'seaoc'
> Subject: Seismic Zones in Texas
> 
> 
> According to the Fig. 16-2 in the 1994 UBC (and I believe also the 1997
> UBC), most of the state of Texas is in Seismic Zone 0.  I understand that
> this is subject to change as the next code becomes more similar to ATC 32
> (or we go to a national code), and that areas that are currently Zone 0
> may
> no longer be so in the future.  Does anyone out there know if/where I can
> find some information on these changes?  A revised seismic
> Zone/acceleration
> coefficient map would be ideal.
> 
> Thanks in advance.
> 
> Tony Powers
> HDR Engineering, Inc.
> 916-351-3837
> tpowers(--nospam--at)hdrinc.com
> 
> 
> 
>