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ratio between the horizontal and the vertical earthquake acceleartion

ratio between the horizontal and the vertical earthquake acceleartion

ratio between the horizontal and the vertical earthquake acceleartion

(OP)
Is anyone aware of the approximate ratio between the vertical and the horizontal earthquake acceleration?
I know it depends on lots of things, but a rough estimate would help me a lot.

 

RE: ratio between the horizontal and the vertical earthquake acceleartion

0.25H=V

RE: ratio between the horizontal and the vertical earthquake acceleartion

(OP)
Thanks Civil, could you please give me a reference for that?

RE: ratio between the horizontal and the vertical earthquake acceleartion

I believe that the ratio went up following the Northridge earthquake where records show a substantial underestimation.  As far as I know, the ratio is more V=2/3H.  

I believe this is in major codes, AASHTO among them.

Regards,
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