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Re: Seismic coefficients for LA

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You can still get the lat/long from the following websites:

Jason Kilgore <jkilgore(--nospam--at)> wrote:
First, the latest thread on this list is discussing the fact that not only did California NOT adopt the IBC, but in fact has recently adopted the NFPA 5000 building code.  The code currently in effect should be ICBO's Uniform Building Code.
But to answer your question anyway, the seismicity varies too much in the greater Los Angeles area to recommend  "general" accelerations over this list.
If you have a copy of the IBC, check to see if it came with a CD.  This CD contains a program to look up accelerations by either USPS Zip Code or Lat./Lon.
Or, go to, and click on "Hazard by Zip Code" or "Hazard by Lat/Lon".
There is also a pretty neat interactive map feature.
You can find lat./lon. using commercial mapping software (Street Atlas, etc.).  There used to be several places to get lat/lon information on the web, but all have either stopped offering that service or have been bought out by Microsoft.
Jason Kilgore
Leigh & O'Kane, L.L.C.
816-444-9655 (FAX)
----- Original Message -----
From: Pedro Khouri
To: seaint(--nospam--at)
Sent: Wednesday, July 30, 2003 12:22 PM
Subject: Seismic coefficients for LA

Sorry if a repost.

I am doing preliminary seismic calculations for the lateral (tie-back) support of a precast veneer (Components & Claddings) at Los Angeles, CA. using the 2000 International Building Code.


Could some one tell me what is the Mapped Spectrum Acceleration (Ss) coefficient for the city of Los Angeles, and an average Site Class to obtain the Site Coefficient (Fa).


Thank you,
Pedro Khouri, P.E.
Director of Engineering
R. E. Pustorino, P.C.
Smithtown, N.Y.

Tripp Howard

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