PTHA - Probabilistic Tsunami Hazard Assessment

Host Institutions:

Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy

Stiftelsen Norges Geotekniske Institutt (NGI), Norway

Universidad de Málaga (UMA), Spain


The Ch-PTHA service offers a computational workflow for Probabilistic Tsunami Hazard Assessment (PTHA) at local scale, which was optimised in the framework of the ChEESE CoE.

Ch-PTHA can be used for computing hazard curves and maps at a target site, due to tsunami originated by seismic events. It takes in input the lower resolution regional hazard model NEAMTHM18. Then, one high-resolution (5-10 m) tsunami inundation simulation has to be run for each of the – typically tens of thousands - tsunamigenic earthquake scenarios among those included in NEAMTHM18, that are relevant for the target site.

The workflow for computing tsunami hazard assessment at local scale is a suite of python/bash codes, in which HySEA GPU-based simulations are embedded, controlled by a master script and an input file in JSON format. The final outputs of the workflow are hazard curves and maps, obtained combining the output of the tsunami simulations and the source probabilities for all the scenarios considered. The hazard curves and maps display the probability of exceeding given levels of inundation within the specified time-range.

The service will be provided through trans-national access, which includes training, co-design of the experiment, computational resources, and assistance for all phases during a physical stay at INGV or at NGI, with the support of UMA for the tsunami simulations with HySEA and of CINECA for the usage of HPC facilities.

Target community/Users:

Academic and Research community, Hazard Practitioners.