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Eruptions in the Cascade Range (1983 version)

By California Volcano Observatory 1983 (approx.)
Graph showing volcanoes on the Y axis and time on the X axis with periods of volcanic unrest or eruptions indicated by points
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Detailed Description

Volcanoes have been erupting in the Cascade Range for over 500,000 years. During the past 4,000 years eruptions have occurred at an average rate of about 2 per century. This chart shows 13 volcanoes on a map of Washington, Oregon, and northern California and time lines for each showing the ages of their eruptions.

Sources/Usage

Public Domain.