OpenQuake does not have GMPEs in terms of SD. However, you can convert SD into SA using the following formula: Sa=Sd(2PI/T)2, where T is a period of vibration, potentially the fundamental period of vibration of the structure.
I have fragility curve datas which based on Sd. I'm defining my parameter to OQ. While I was defining my values to OQ, I receive an error about Invalid IMT when I write Sd to the IMT Part. So I'm wondering that should I convert it yo Sa or PGA?
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