Maximum Ss and S1 in Southern California

[mcr07]

I understand that this topic may be more related to Seismology Engineering, but i believe there's more traffic on this forum.

I'm working on a project that will require the knowledge of the maximum Ss and S1 for site class D in Southern California.
Can anyone point me in the right direction in order to find this information?
I understand we can use the tools at USGS to find site specific values, but I'm trying to find the maximum Ss and S1 in So-Cal.
The Occupancy category will be I, II or III and the governing code is the ASCE7-05

Thanks!

 

[JAE]

Why do you need the maximum? Why not use the one that applies to your site?

Or is this a generic structure that may be located anywhere in the state and you need to design a prototype?

 

[mcr07]

That's correct JAE. I need to design for the maximum since this could be used anywhere in SoCal. (Pole footing for light pole)

 

[msquared48]

Personally and professionally speaking, I don't think that Southern Cal has a max. That is yet to come...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[azcats]

You could use the USGS tool and go thru by zip code. It gives you the worst case in each zip. Possibly simplify by looking at the code maps and picking the zip codes in the 'worst' areas.

 

[mcr07]

Thanks! I found what i needed with this link

http://geohazards.usgs.gov/designmaps/us/regions.php

Actually, i had to assume the entire state, since i didn't have much time for this submittal.
Still, numbers were reasonable.

Thanks again!

 

[JStephen]

In past experience- a lot of the seismic design was based on site-specific response spectra, with loading higher than the mapped values.