抄録
We developed a discrete element model to describe extrusion of middle-high viscous lava at the surface. We set the viscosity of magma at 107 to 1010Pa s for the numerical simulations and arbitrarily set the rising velocity to be constant to the bottom of the conduit, as an extrusion model of magma. The conditions under which the lava dome or lava flow will form depend on not only the viscosity of the magma but also its rising velocity in the conduit. The velocity at which the lava dome is formed is dependent on the viscosity of magma, with magma of lower viscosity requiring higher rising velocity in order to form a dome. The inside structure of the lava dome is a concentric circle and is similar to those formed in previous analogue experiments.
