ratio between the horizontal and the vertical earthquake acceleartion 1

[mahisub]

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.

 

[civilperson]

0.25H=V

 

[mahisub]

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

 

[Qshake]

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,
Qshake

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[msucog]

http://www.bssconline.org/08NEHRPproposals/09proposals/Proposal3-3.pdf