The methodology consists of a combination of probabilistic tsunami hazard assessment (PTHA), combined with GIS analysis for providing tsunami inundation maps (a static map of the 500 year return period global tsunami hazard data is shown in Figure 1). The data are provided for a return period of 500 years. The maps are projected on open source topographic data. The PTHA analysis contains a range of different steps, including simulations of thousands of scenarios, and is documented in the following references (Løvholt et al., 2014; 2015; Davies et al., 2018), links to these papers are given below. Tsunami exposure is calculated by combining a global population dataset (GRUMP) with STRM terrain model and projected tsunami inundation heights using global amplification factors.

This service is part of the candidate Thematic Core Service for tsunami and will be integrated into the Integrated Core Service Data Portal of the European Plate Observing System (EPOS).

Global tsunami hazard figure

Figure 1: Graphics showing the global tsunami hazard map.

GIS modelling

The goal of the GIS calculation was to take the maximum inundation heights points at points along the shoreline and produce hazard maps (which areas are wet).  The results of these calculations are published as a Web Map Service (WMS) and a Web Coverage Service (WCS) service.  The WMS service is a map service ready for display in GIS applications supporting the WMS standard while the WCS service is a service ready for downloading and processing data.  See the specification for the service types at and

Link to the WMS service with GAR data:

Link to the WCS service with GAR data: (Currently the WCS link is only available via QGS, we are working on making it available in ArcGIS):

Papers describing the methodology:

Løvholt et al., (2014), International Journal of Disaster Risk Reduction:

Løvholt et al., (2015), Complexity in Tsunamis, Volcanoes, and their Hazards pp 213-246

Davies et al., (2018), Geological Society of London:

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