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Eruption History

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Mount Bachelor viewed from the south. Sparks Lake and South Sister...

Geology and History Summary for Mount Bachelor

Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
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Cascades Volcano Observatory, Mount Bachelor
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Geology and History Summary for Mount Bachelor

Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
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Mount Bachelor viewed from South Sister, Oregon....

Eruption History of Mount Bachelor Volcanic Chain

Four discrete eruptive episodes are recognized.
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Cascades Volcano Observatory, Mount Bachelor
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Eruption History of Mount Bachelor Volcanic Chain

Four discrete eruptive episodes are recognized.
Learn More