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GVM and Tephra Hazard Modelling

The IAVCEI Commission on Tephra Hazard Modeling gathers together scientists with different tephra hazard experiences (e.g. modelers, model users, field volcanologists) in order to integrate and improve current hazard approaches and tephra-dispersal models. The Commission collaboratively works together with other scientific networks, in particular the Global Volcano Model (GVM;, and interested authorities (e.g. VAACs).

Primary Commission goals are:
(i) Validate existing tephra-dispersal models and modelling strategies;
(ii) Identifying potential improvements to existing models and assessment of model inputs (Eruption Source Parameters; ESP); (iii) Compiling a comprehensive dataset for modeling validation;
(iv) Defining best practices and protocols for field data collection in order to quantify the accuracy of derived eruptive parameters.

The Commission works through periodic meetings aimed at exchanging relevant published and unpublished information about modeling approaches and data used for model parameters. The Commission has recently created three Working Groups (WGs) on specific topics of general interest (tephra sampling protocols and derived parameters, modelling volcanic ash aggregation phenomena, and update of eruptive parameters database of selected eruptions). Specific commitments of the different WGs will be the review of the state of the art on the selected topics and to make proposals for the improvements in the methodologies of data collection.


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