Table 6 Required documentation for volcanic vulnerability and fragility function(s)

Infrastructure sector and sub-sector applicability

The infrastructure sector and/or sub-sector that the functions have been derived for and which sector they are applicable to (e.g., are functions derived for an entire water supply sector or the underground pipe network).

Specific asset typology

The specific asset typology (e.g., a specific type of water pump) the functions have been derived for or an indication if functions are for mixed typologies (e.g., all water pump designs).

Data source(s)

Source (bibliographic reference if available) of the volcanic impact data used to derive functions. If expert judgment was used, a description of how the judgment process was conducted is recommended.

Data quality rating

Overall quality of the impact dataset used based on the quality rating scheme in Table 3.

Number of observations

The total number of observations (data points) used to derive fragility and vulnerability functions.

Impact metric (IM)

The impact metric used and justification for its use.

Hazard intensity metric (HIM)

The volcanic hazard intensity metric used and justification for its use.

Impact state (IS)

The volcanic impact state scale used or if a new scale was developed, a description of each impact state and justification for its use.

Function form, fitting and manipulation

The mathematical form of the functions used (e.g., linear, lognormal CDF, binary), the fitting technique used (e.g., linear regression, least-squares, expert judgment) and any data manipulation performed.

Assumptions

Discussion of any and all assumptions and decisions made during the process of data manipulation and function fitting.

Uncertainties

Discussion and identification of the uncertainties associated with the derived functions and how they are accounted for.

Limitations

Discussion of any and all limitations of the derived functions. In particular, limitations which indicate what the function should not be used for.