Modeling of volcano inflation associated with magma ascent in an open conduit

研究了由带有气泡的岩浆上升所产生的火山膨胀。由于扩散流，随着气泡的增长，岩浆上升，导致火山膨胀以恒定的速度或暂时加速的变化。对于在粘性熔体中上升的大段塞的情况，当段塞接近地面时，火山膨胀变成泄气。有限元计算表明，岩浆头部高于测地站后，火山膨胀率变小。

Volcano inflations generated by ascent of magma with gas bubbles are investigated. Ascent of magma with gas bubble growth due to diffusive flow causes volcano inflation with a constant rate or temporally accelerated change. For the case of a large slug rising up in viscous melt, volcano inflation turns to deflate when the slug approaches to the ground surface. Finite element calculations indicate that the volcano inflation rate becomes small after the magma head goes above a geodetic station.