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。

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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。

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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。

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While not the only process at work, eruptive activity played the primary role in accelerating retreat and as a consequence in glacier extinction.

UNESCO: Dublin Core

After "eruptive activity" last year at the Cleveland volcano, University of Alaska Fairbanks scientist Steve McNutt noted that 90% of air freight from Asia to Europe and North America flies over Alaska airspace, and hundreds of flights fly through Anchorage's air space daily.

CNN: 2 Alaska volcanoes on alert as lava flows