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.Picture Date: July 21, 2009
Image Creator: Cameron, Cheryl;
Image courtesy of the AVO/ADGGS.
Please cite the photographer and the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys when using this image.
To obtain a high-resolution image, open the full size page. Then, right click on the image and click
"Save Image As..." or "Save Picture as..."Full SizeClose this window
Source : Alaska Volcano Observatory (http://www.avo.alaska.edu)
URL: http://www.avo.alaska.edu/image.php?id=14050