Implementation-Details.md

# Implementation Details

## Logic Trees

The logic trees of epistemic uncertainty described in previous section are represented internally
using graphs of indexed nodes that connect a `root` node with one or more `leaf` nodes:

![image](images/tree-example.png "Example logic tree graph")

The different logic trees for sources, MFDs and GMMs have similar representations:

![image](images/tree-types.png "Primary logic tree types")

And each unique branch combination across all trees is considered in the hazard integral:

![image](images/tree-branches-combined.png "Logic tree branch combination")

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[**Documentation Index**](../README.md)

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![USGS logo](./images/usgs-icon.png)  [U.S. Geological Survey](https://www.usgs.gov)
National Seismic Hazard Mapping Project ([NSHMP](https://earthquake.usgs.gov/hazards/))