multiple gmpes realization

[Chay]

I am currently working on a seismic hazard analysis project using OpenQuake and have incorporated multiple GMPEs with equal weighting to generate PGA values. Each GMPE has been assigned a weight of 0.25, and while I understand the value of having individual outputs from each GMPE for detailed analysis, I am looking to combine these outputs into a single PGA value for each site.

After running the analysis and loading the outputs into QGIS using the OpenQuake plugin, I noticed that the results are separated by GMPEs, labeled as 0, 1, 2, and 3. While this is informative, my project requires presenting a unified PGA result that reflects the combined influence of all used GMPEs.

Could you please provide guidance or suggest a method within OpenQuake or QGIS that would allow me to aggregate these individual PGA outputs into a single output layer, considering their assigned weights? Any tips on scripts or plugins that could facilitate this process would also be greatly appreciated.

[Lana Todorovic]

Dear user,

You might want to explore this option, https://github.com/gem/oq-engine/blob/eb86ab69e579ac04c80bc0d93ac5080160d73cba/openquake/qa_tests_data/logictree/case_19/gmpe_logic_tree.xml#L32 

Hope this helps!