Abstract
This paper introduces an open source computer code to perform an integrated probabilistic spatio-temporal volcanic hazard assessment in distributed volcanic fields. The program, named MatHaz, is a set of Matlab scripts that follows a sequential methodology. After the user has provided a set of input files, this tool first estimates the spatial probability of future volcanic vents, then the temporal probability of future volcanic events, and finally models up to five volcanic phenomena (pyroclastic density currents, ballistic projectiles, lava flows, lahars, and tephra fallout) following a probabilistic approach. These results can be combined and depicted as an integrated quantitative (and/or qualitative) volcanic hazard map, with weightings of hazard factors chosen by the user. We illustrate the use of this tool by applying it to the Carrán-Los Venados Volcanic Field in southern Chile. The open-source, replicable, and user-friendly nature of the code allows its application to any volcanic region of the world, regardless of its extent, type, and amount of volcano-structural data.
Highlights
At present, apart from analyses of vent location and/or onset time of eruption, few volcanic hazard assessments in volcanic fields have dealt with the distribution of specific eruptive hazards
Some attempts concentrate on a single volcanic phenomenon, mainly pyroclastic density currents (PDCs; Sandri et al 2012; Neri et al 2015) and lava flows (Connor et al 2012; Gallant et al 2018); there are very few studies that have included several volcanic phenomena (Alcorn et al 2013; Bartolini et al 2014, 2015; Becerril et al 2014, 2017; Sandri et al 2014)
In order to address the challenge of assessing hazard in volcanic fields, this paper introduces an open source computer code, named MatHaz, developed to carry out Bertin et al Journal of Applied Volcanology
Summary
Apart from analyses of vent location and/or onset time of eruption, few volcanic hazard assessments in volcanic fields have dealt with the distribution of specific eruptive hazards This strong bias towards spatial and temporal assessments is mainly due to the difficulty in addressing, in a single assessment, the multiple volcanic phenomena that might be produced by any subsequent eruption. The more sophisticated the model is, the longer the execution times This is a challenge for hazard assessment in volcanic fields where there are many potential vents, adding an extra complexity, so that a strategy to adequately (and timely) assess multiple volcanic phenomena is desirable. Over the last 50 years several probabilistic and geological approaches have been applied to forecast the location, timing, type, and impacts/effects of future volcanic events in distributed volcanic fields
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