1cb1e6f0-c8b6-449e-8876-22dece0cd3c0 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-17T01:14:49 creation ISO 19115 2016 The 2018 Australian Probabilistic Tsunami Hazard Assessment 1cb1e6f0-c8b6-449e-8876-22dece0cd3c0 This report describes the 2018 Probabilistic Tsunami Hazard Assessment for Australia (henceforth PTHA18). The PTHA18 estimates the frequency with which tsunamis of any given size occur in deep waters around the Australian coastline. To do this it simulates hundreds of thousands of possible tsunami scenarios from key earthquake sources in the Pacific and Indian Oceans, and models the frequency with which these occur. To justify the PTHA18 methodologies a significant fraction of the report is devoted to testing the tsunami scenarios against historical observations, and comparing the modelled earthquake rates against alternative estimates. Although these test provide significant justification for the PTHA18 results, there remain large uncertainties in “how often” tsunamis occur at many sites. This is due to fundamental limitations in present-day scientific knowledge of how often large earthquakes occur. {"type": "Polygon", "coordinates": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]} 112.0 154.0 -44.0 -9.0 Published_External Tsunami hazard assessment annual exceedance earthquake sources hazard deaggregation hazard modelling tsunami scenario uncertainty quantification Download the record (pdf) documentDigital Download the record (pdf) PDF Link to website documentDigital Link to website HTML