A new volcano_scenario calculator will be included into the OQ engine, as part of the milestones proposed in CRAVE project.

The attached .zip file includes the required input files for a volcano scenario.
volcano_input_files.zip

The following steps will be followed:

1. The calculator will start from precomputed hazard footprints in csv format (units should be consistent with fragility/vulnerability inputs).
   Four hazard perils will be considered:

• Lava flow (binary: 1 for affected, 0 for not affected)
• Lahars (binary: 1 for affected, 0 for not affected)
• Pyroclastic flow (binary: 1 for affected, 0 for not affected)
• Ash fall (continuous phenomena similar to ground shaking). The intensity is most commonly measured as thickness of ash fall (mm).

2. An exposure model will describe the asset location and characteristics of the structures, following the current OpenQuake format. It is mandatory to include the number of buildings per asset. Number of occupants is optional.

3. Fragility, consequence and vulnerability models can be assigned to ash_fall phenomena.

• Users can assign Fragility and Consequence models, or
• Users can assign Fragility and Vulnerability models
• It is not possible to assign at the same time Consequence and Vulnerability models

4. Fagility and Vulnerability for lava_flow, lahars and pyroclastic_flow is assumed to be binary:

• 1 for total_damage → if the hazard footprint is close to the asset location (use param asset_hazard_distance)
• 0 for no_damage → if the hazard footprint is far from the asset location (use param asset_hazard_distance)

5. The outputs for this calculation will be:

• Hazard footprints
  Possibility to visualize and download the hazard footprints in QGIS plugin

• Asset hazard
  For each asset in the exposure model, identify the level of hazard.
  The following image presents an example of the output format:

• Volcanic risk
  For each peril, present the number of affected buildings, occupants (if included in exposure model) and economic cost.
  The following image presents an example of the output format:

NOTE: The affected occupants for ash_fall is missing