CMS calculation logic in OpenQuake (conditional_spectrum.py)

[SeismicStudent]

Dear OpenQuake Community,

Hello, everyone. I am currently conducting research on the Conditional Mean Spectrum (CMS).

As established in Baker's literature, the CMS is typically derived from seismic hazard deaggregation. This process yields magnitude-distance-epsilon pairs along with their respective hazard contributions (weights).

To calculate the CMS, the common approach is to use a weighted average of these deaggregated bins to determine the final representative  magnitude-distance-epsilon   values. I would like to confirm if OpenQuake employs this exact methodology for its CMS implementation.

I have been analyzing the conditional_spectrum.py file to understand the underlying logic, but I am finding it a bit challenging to navigate the code.

I would greatly appreciate any insights or guidance on how OpenQuake handles these calculations.

I look forward to hearing your thoughts on this. Many thanks. Sincerely,

[Marco Pagani]

In the OQ Engine, we have a CS spectrum calculator. Read the ‘Aggregation Approach to Method 4 (Exact CS)’ in Lin et al. (2013). https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/103/2A/1103/331576/Conditional-Spectrum-Computation-Incorporating

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