火山灰流是指火山喷出的挟有大量火山灰的高热气流。也有将火山灰流作为火山碎屑流的同义语使用。
默拉皮火山似乎不可能爆发到这种程度，但是它能够带来危险性极强的火山灰流。
Merapi seems unlikely to explode on anything like this scale, but it has brought the risk of pyroclastic flows.
因此测量火山灰流的电荷量能够帮助科学家们更好的对火山灰的行动路线以及持续时间做出预判。
Measuring a plume's charges could therefore help scientists better estimate where the ash will go and how long it will stay aloft.
由于担心漂浮的火山灰可能阻塞飞机引擎，横贯欧洲大陆的火山灰流让途径欧洲飞往各地的航线被纷纷滞留。
The plume traveled to continental Europe, grounding flights around the world for days, due to fears of ash clogging plane engines. (Find out more about the risks volcanic ash poses to airplanes.)
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