Diagnosing magma head height in a volcano conduit with cosmic ray radiography and high quality gravity observation

我们提出了一种估算火山导管中岩浆头位置的新方法。它利用了岩浆在管道中上下移动时重力会发生变化的原理。利用宇宙射线照相技术成功地估计了管道的几何参数，消除地下水扰动后的重力数据可以确定管道的水头高度。这一结果对于讨论较浅部分的岩浆运动与火山活动的关系具有重要意义。

We developed a new method to estimate the location of a magma head in a volcano conduit. It utilizes that gravity should change as magma goes up and down in the conduit. The gravity data after eliminating groundwater disturbance enables us to determine the head height as geometrical parameters of the conduit is successfully estimated with the cosmic ray radiography. The result is essentially important to discuss how magma movement in the shallower part is related to the volcanic activity.