富士山周边的地面在强降雨期间最高会上升约2厘米，但这并不是岩浆活动的信号。研究指出，这种抬升与山体下方特殊的地质结构有关，因此不能把所有地表隆起都直接解读为火山危险的征兆。

这项研究由香港理工大学的水文测地学家Shuo Zheng领导。团队分析了2017年至2023年间围绕富士山的监测站网络每日GPS数据，发现这种与降雨相关的地面变形呈现出可重复的模式，说明降雨本身就可能影响火山观测结果。

其实际意义在于，火山监测必须区分真正的地下岩浆移动与由水文过程引起的表面变化。对于像富士山这样受到密切监控的火山，理解这种差异有助于避免误判，并提高对喷发前兆的解释准确性。

Ground around Mount Fuji can rise by up to 2 centimeters during heavy rainfall, but the uplift is not a sign of magma movement. The study says the change is tied to the mountain’s unusual subsurface geological structure, so not every surface rise should be read as a volcanic warning.

The research was led by hydrological geodesist Shuo Zheng at Hong Kong Polytechnic University. His team examined daily GPS data from 2017 to 2023 collected by monitoring stations around Mount Fuji, and found a repeatable rainfall-linked deformation pattern that shows precipitation can affect volcanic measurements.

The practical lesson is that volcanic monitoring must distinguish true underground magma motion from surface changes caused by hydrological processes. For a closely watched volcano like Mount Fuji, recognizing this difference can reduce false alarms and improve interpretation of eruption precursors.