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Can you find the site class from the PGA or the Mapped Acceleration Parameters?

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CDG31

Structural
Feb 22, 2018
8
US
Hi,

I am wondering if the site class can be identified from the PGA for a specific site or the site Mapped Acceleration Parameters Ss or S1? If so, how?

Thanks,
 
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I got asked a question recently that just threw me off. The question was three lines long,

PGA = 0.3
S1 = 0.9 (I think S1 was 0.9, but I don't recall exactly what the value was)
Find PGAm?

I know PGAm can be found using section 11.8.3 from ASCE 7-16 but the factor Fpga, is based on the site class not S1. Thus, I got confused on how to find PGAm. I am not sure if you have any comments that could help me solve this question.
 
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