Eruptive activity at Nevado del Ruiz may have occurred in 1994, but this is not confirmed.
据称1994年火山也发生一次喷发，但未得到进一步确认。
Geologists estimate, however, that Mt. Hood has experienced bursts of eruptive activity in the past 15, 000 years.
一些地质学家估计，胡德火山在过去的15,000年里经历过大规模的喷发活动。
Except for some minor eruptive activity in the mid-nineteenth century, the volcano has been inactive since formal records began in the 1820s.
19世纪20年代有正式史料记录以来，除了19世纪中叶的一些小喷发以外，该火山基本不活动。
Our scientists here compile that information, and we have someone stationed here from the USGS Volcano Hazards Program who puts out a weekly report of eruptive activity all over the globe.
我们这里的科学家会收集这些信息，并且我们这里有来自美国地质勘探局火山灾害机构的人，他们会向全球发布关于喷发活动的周报。
The characteristics of volcanic activity with the time have been analysed and eruptive frequency, eruptive type, present activity have been shown in this paper.
分析了我国现代火山在时间上的活动特点。喷发频率、火山喷发类型及其现代活动表现。
The characteristics of volcanic activity with the time have been analysed and eruptive frequency, eruptive type, present activity have been shown in this paper.
分析了我国现代火山在时间上的活动特点。喷发频率、火山喷发类型及其现代活动表现。
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