NUMERICAL MODELING OF THE QUASISTATIONARY REGIME OF ERUPTION OF A VOLCANO AT THE INITIAL STAGEN. A. Kudryashov,a G. S. Romanov,b and A. F. Shevyakova UDC 519.6 Under the assumption of axial symmetry, the quasistationary phase of the initial stage of a volcanic eruption is modeled. The constructed model allows calculation of the distribution of the regimes of magma flow in the volcanic channel and the quasistationary distribution of a suspension of gas-dust volcanic ejections in the atmosphere from the prescribed parameters of the magmatic source. The model can be used for evaluation of the parameters of the atmosphere above an erupting volcano, the height of a dust column during the quasistationary phase of eruption, the thickness of the layer of ash fallen on the earth, and other forms of action of volcanic eruptions on the environment. aMoscow Engineering-Physics Institute (Technical University), Moscow, Russia; bA. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 4, pp. 46-52, July-August, 2003. Original article submitted November 13, 2002.