火山喷发前兆，包括在实际爆发强震群和快速地面变形，通常发生几天到几周。
Precursors to volcanic eruptions include strong earthquake swarms and rapid ground deformation and typically take place days to weeks before an actual eruption.
这片位于米达尔斯冰盖北部的熔岩原是用来追踪地面形变的监测点之一，这里地面的形变可以被视为卡特拉火山喷发的前兆。
This lava field just north of the Mýrdalsjökull ice cap serves as one of many monitoring sites to track ground deformation that could serve as a signal of an impending eruption of Katla.
White说：“得知何时火山的不稳定成为喷发的前兆是一项挑战，而更大的挑战在于预测即将到来的喷发规模。”
“It will be a challenge to know when restlessness becomes a precursor to eruption, and a bigger challenge yet to predict the scale of a coming eruption, ” says White.
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