They compared ash that was ejected in the early, explosive phase of the eruption with ash from a later, more typical eruption of the volcano.
他们比较了取自火山爆发期次的喷发早期的火山灰和取自典型火山喷发的喷发后期的火山灰。
The last explosive eruption of the volcano, based on historical records, occurred in 1877.
据史料记载，这座火山最近一次喷发是在1877年。
After more than a week of relatively subdued activity in late April, Iceland's Eyjafjallajokull Volcano began a fresh round of explosive ash eruptions in the first week of May.
在四月底超过一周的相对减弱活动后，在五月的第一周，冰岛eyjafjallajokull火山开始了新一轮的火山灰喷发。
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