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。
Ash particles from the early part of the eruption were especially sharp and abrasive, posing a possible threat to aircraft flying through the cloud.
火山喷发早期出现的火山灰颗粒特别锐利且粗糙，对通过它的飞行器可能造成威胁。
"This eruption is directed right at us and is expected to get here early in the day on Aug. 4th," said Leon Golub of the Harvard-Smithsonian Center for Astrophysics.
“这次的太阳喷发直接吹向我们，而且将会在8月4日的早些时候到达，”哈佛—史密森天文中心的利昂·格勒布说。
Eyjafjallajokull's most recent previous eruption, from late 1821 to early 1823, also had quite viscous lava. But that does not mean the volcano produced fine ash continuously.
岛山冰山最近的爆发发生于1821年年底到1823年之间，熔岩粘度也很大，但那并不意味着火山会不断地产生细火山灰。
He did, however, note that seismic shocks could serve as an early warning of an eruption, giving people plenty of time to get to safety.
但他同时指出，可以将地震活动看做火山喷发的早期预警，从而争取足够的时间撤离群众。
Eyjafjallajokull's most recent previous eruption, from late 1821 to early 1823, also had quite viscous lava.
最近一次埃亚·菲亚·德拉火山喷发，从到1821年底到1823年初期间，也有十分黏稠的熔岩。
Mesozoic volcanic eruption belt, which locates on Beihuaiyang area in northern part of Dabie orogenic belt, formed at post orogenic stage during Late Jurassic to Early Cretaceous.
大别造山带北部的北淮阳中生代火山喷发岩带形成于后造山阶段的晚侏罗世—早白垩世。
The volcanic rocks formed in a tectonic environment of deep thermal collapse eruption in the Early-Mid Permian late-orogenic phase.
构造环境为早中二叠世造山后期深部热力塌陷火山喷发环境。
Macules may constitute the whole or part of the eruption, or may be merely an early phase.
斑疹可构成整个或部分皮疹，或仅是早期表现。
Macules may constitute the whole or part of the eruption, or may be merely an early phase.
斑疹可构成整个或部分皮疹，或仅是早期表现。
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