# HyFI Core Modules

**HyFI** consists of several interconnected analysis modules that work together to reconstruct 3D fault geometry from earthquake hypocenter data.


## Core Module Execution Order

A typical single-sequence HyFI analysis follows this sequence of module execution:

1. **Fault Network Reconstruction**: Generate 3D rupture planes from hypocenter distributions for each earthquake individually
2. **Model Validation** (optional): Compare results of rupture planes with focal planes for earthquakes with a focal mechanism solution
3. **Automatic Classification** (optional): Group earthquakes into clusters that likely belong to the same active fault by clustering both the rupture plane orientations as well as spatial attributes
4. **Stress Analysis** (optional): Calculate stress parameters (e.g. slip and dilation tendencies) under the given (regional) stress field
5. **Visualization**: Interpolate the grouped rupture planes to produce active fault meshes, generate interactive 3D models and export the results (e.g. as VTP)


## Core Analysis Modules

Please refer to the following detailed descriptions of the **HyFI** core analysis modules:

```{toctree}
:maxdepth: 1

fault_network
model_validation
auto_classification
stress_analysis
visualization
```

Each module can be configured independently through the JSON configuration file. See **[HyFI Configuration](../configuration)** for details.

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Happy fault imaging! 🎉