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1. Eject!: A program for the calculation of ballistic trajectories of volcanic blocks [USGS_EJECT]
Eject is a program developed by Volcano-Groundwater Interaction Project Chief, Larry G. Mastin, at the U.S. Geological Survey's Cascades Volcano Observatory. The program is a simple Microsoft ...

2. Conflow: A numerical program for conduit flow and thermodynamics [USGS_CONFLOW]
Conflow is a model that calculates flow properties (pressure, vesicularity, and some 35 other parameters) as a function of vertical position within a volcanic conduit during a steady-state eruption. ...

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