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Laharz_py is a statistically based computer program capable of generating debris-flow and lahar hazard maps very rapidly, even in the absence of site-specific information other than topography. The software calculates a hazard zone on and around a volcano and estimates hazard zones downstream far from the volcano as areas of potential inundation. It is a python-language computer program built on a GIS platform (compatible with ArcGIS version 10 or later), and is based on statistical trends of worldwide data. The model has also been applied to and calibrated using real-world scenarios of non-volcanic debris flows and rock avalanches.