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" ... BS: Unlike predicting earthquakes, which so far eludes seismologists, we can actually predict volcanic eruptions fairly well, given sufficient monitoring and understanding of the volcano. One of the major tools in our toolbelts for this is seismology. The idea is that as magma moves around underground, it breaks rock in the process. Breaking rock sends vibrations through the ground as earthquakes that we can measure. If we pay close attention to the pattern of the earthquakes in space and time, we can track the movement of magma beneath the surface. We look for earthquake epicenters marching laterally to indicate magma propagation, and if they start getting shallower towards the surface, that might indicate where an eruption could happen. ... "