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

本文研究了由岩浆带气泡上升引起的火山膨胀。由于扩散流，岩浆上升伴随气泡增长，导致火山以恒定速率或时间加速变化膨胀。对于在粘性熔体中上升的大颗粒，当颗粒接近地面时，火山膨胀转变为收缩。有限元计算结果表明，当岩浆头上升到测地站以上时，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.