From Geoscience Australia
JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Emulating volcanic ash fall for multiscale analysis: Development of the VAPAHR tool and application to the Asia-Pacific region for the United Nations Global Assessment Report 2015

Created 17/10/2025

Updated 17/10/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Significant advances have been made in recent years in probabilistic analysis of geological hazards. Analyses of this kind are concerned with producing estimates of the probability of occurrence of a hazard metric at a site given the location, magnitude, and frequency of hazardous events around that site. Significant advancements have been made towards the probabilistic assessment of earthquake hazard leading to the development of Probabilistic Seismic Hazard Analysis (PSHA). PSHA is a method for assessing and expressing the probability of earthquake hazard at a site of interest in terms of probability of exceeding certain ground motion intensities. Probabilistic methods for assessing volcanic ash hazard at a regional-scale are less advanced. The methodology presented here, Probabilistic Volcanic Ash Hazard Analysis (PVAHA), modifies the four-step procedure of PSHA for volcanic ash and applies it at a regional-scale. PVAHA considers a magnitude-frequency distribution of eruptions and associated volcanic ash load attenuation relationships and integrates across all possible events to arrive at an annual exceedance probability for each site across a region of interest. PVAHA can be aggregated to generate maps that visually convey the expected volcanic ash hazard for sites across the region at return periods of interest, or disaggregated to determine the causal factors which dominate volcanic ash hazard at individual sites. PVAHA results can be used to identify priority areas for more detailed, local scale ash dispersal modeling that can be used to inform disaster risk reduction efforts.

Files and APIs

Tags

Additional Info

Field Value
Title Emulating volcanic ash fall for multiscale analysis: Development of the VAPAHR tool and application to the Asia-Pacific region for the United Nations Global Assessment Report 2015
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/f5092355-593a-4fa9-ae71-68457f5a9565
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Emulating volcanic ash fall for multiscale analysis: Development of the VAPAHR tool and application to the Asia-Pacific region for the United Nations Global Assessment Report 2015". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/emulating-volcanic-ash-fall-for-multiscale-analysis-development-of-the-vapahr-tool-and-app-2015