Seismic hazard probability of exceedence conversion

[amendale]

Hi,

We are conducting a preliminary study on a site. I am trying to ballpark our design seismic acceleration but I'm having trouble finding any data as it is in South America. The preliminary geotech report gave us 0.3g PGA with 50% exceedence in 50 years. Is there a way to estimate the PGA for 2% exceedence in 50 years?

 

[TLHS]

Don't know how much information they have around your area, but you can get seismic info that's compatible with the IBC here:

http://earthquake.usgs.gov/hazards/designmaps/wwdesign.php

Probably shouldn't use it for design without outside confirmation, but it's an okay start point.

 

[bkal]

Section 2 of Eurocode 8, Part 1, might give you some general information you need (relationship between probabilities of excedance and return periods, and pga), but you will need to confirm that it is applicable to your conditions.

 

[amendale]

Thanks TLHS, I have looked through USGS before but I must have missed that resource, the best I found before were just countour maps of 10% exceedence PGA. That link gave me what I needed.