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In contrast, for Tokyo there is 25%% likelihood that maximum ash hazard would come from Hakone; however, there is still a significant likelihood that Fuji would be a major contributor.
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The estimated maximum ash load hazard is further broken down by VEI for three timeframes (100, 1000, and 10,000 years).
The algorithm will then calculates the cumulative probability of each event (e.g. each instance where a volcanic ash load was recorded from one or more sources) for the first site and generates a hazard curve of volcanic ash load (kg/m2) versus annual probability of exceedance and the maximum expected ash hazard for timeframes of interest (specified by the user in the configuration file).
Like, PSHA the PVAHA results can be post-processed using VAPAH to generate hazard curves for annual probability of exceedance at sites of interest (or all sites), maps for maximum expected ash hazard at timeframes of interest and histograms which disaggregate the hazard (e.g. location, magnitude, source etc).
PVAHA results can be post-processed using VAPAH to generate hazard curves for annual probability of exceedance at sites of interest (or all sites), maps for maximum expected ash hazard at timeframes of interest and histograms which disaggregate the hazard (e.g. location, magnitude, source etc).
Hazard calculations were aggregated for each site and maps were generated which display the maximum expected ash hazard (kg/m2) at each site across the Asia-Pacific at the 100-, 1000- and 10,000-year timeframes (e.g. 1-in-100 1-in-100 1-in-1005).
Finally, hazard thresholds such as maximum distance from source, maximum ash load value at source and minimum sum of ash load needed to generate hazard curves or histograms can be set here by the user.
Probabilistic Volcanic Ash Hazard Analysis.
The modelling framework presented here, Probabilistic Volcanic Ash Hazard Analysis (PVAHA), adapts the seismologically based PSHA technique for volcanic ash.
The volcanic ash hazard maps developed in this study highlighted the potential exposure of communities in these countries to volcanic ash hazard.
Here we present a regional-scale volcanic ash hazard assessment for the Asia-Pacific using a newly developed framework for Probabilistic Volcanic Ash Hazard Analysis (PVAHA).
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