Story: Historic volcanic activity
These diagrammatic ash clouds give an indication of the size of eruptions in New Zealand in relation to the major, well-known eruptions of St Helens (USA), Pinatubo (Philippines) and Tambora (Indonesia).
Source: Bruce Houghton and others. Eruption! Mt Ruapehu awakes. Auckland: Viking, 1996.
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Te Ara - The Encyclopedia of New Zealand
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