Issue Applying bGRRelative Uncertainty with Mixed MFD Types in Logic Tree

[Sujata]

Dear OQ users,

I’m using three source models in my logic tree: two with truncated Gutenberg–Richter MFDs and one with an Incremental MFD . I’ve assigned them equal weights and applied bGRRelative and maxMagGRRelative uncertainties.

ValueError: Modification increment_b is not supported by EvenlyDiscretizedMFD. 

Is it possible to apply bGRRelative with mixed MFD types?  kindly suggest how can i  handle this

[Marco Pagani]

It is not possible. To model any MFD, you can use the EvenlyDiscretized mfd in combination with the incrementalMFDAbsolute typology of uncertainty. See https://github.com/gem/oq-engine/blob/master/openquake/qa_tests_data/logictree/case_21/source_model_logic_tree.xml#L14

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