The early years on this graph are heavily influenced by just a few expedition log books and the writings of Father Veniaminof: the ~120 possible eruptions during the Russian American period come from fewer than 20 documents, and eruptions from 1867-1940 are also probably significantly under-observed and under-reported. Increases from 1880-present day are probably the result of increased population, communications, and travel, rather than an actual increase in volcanic eruptions.
| Date: | July 21, 2009 12:00 AM |
| Volcano(es): | |
| Photographer/Creator: | Cameron, Cheryl |
Citation Information:Image courtesy of the AVO/ADGGS.
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