The IAVCEI Commission on Tephra Hazard Modelling (THM) was established in 2003 to advance the quantitative understanding of tephra hazards through numerical modelling and field data. Over the past 15+ years, the Commission has organised workshops and symposia, and strengthened collaboration among numerical modellers, field geologists, and operational forecasters from VAACs and volcano observatories.
Our work has produced several notable outcomes, including:
- a benchmark dataset for validating volcanic tephra sedimentation models;
- scientific recommendations for collecting the largest clasts in tephra deposits to help determine plume height;
- a consensus document from two IUGG–WMO workshops on volcanic ash and aviation (2010, 2013); and
- a Journal of Volcanology and Geothermal Research special issue on eruption column model intercomparison.
We are currently leading a Geological Society of London / AGU GeoHorizons volume titled Tephra: From Reconstructing Past Volcanic Eruptions to Modelling and Forecasting Future Hazards.
Our Goals
The Commission works to:
- Calibrate existing tephra-dispersal models
- Identify improvements that enhance model precision and accuracy
- Compile comprehensive datasets for model validation
- Define a standardised tephra-sampling protocol and quantify uncertainties in eruptive parameters derived from field data
- Assess the feasibility of running models across different computing environments – from personal computers to parallel clusters and remote servers with internationally accessible web interfaces
- Present results in a framework that allows new research to be seamlessly integrated into analytical and numerical models for tephra hazard assessment