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The Volcanic History and Eruptions of Mt. Tehama: A Geological Overview

Mt. Tehama, a composite volcano formed between 600,000 and 400,000 years ago, showcases a dynamic geological history marked by collapse and erosion. The most recent activity occurred from 1914 to 1917, with notable steam-blast eruptions. The May 19, 1915 eruption resulted in significant lahar flows and mud floods. Key locations such as Bumpass Hell and Sulphur Works highlight the geothermal activity present in the region. This overview captures Mt. Tehama's fascinating volcanic features and eruptions.

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The Volcanic History and Eruptions of Mt. Tehama: A Geological Overview

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Presentation Transcript

  1. History • Mt Tehama composite volcano built 600,000 to 400,000 years ago • Mt Tehama collapse(?) and erosion • Domes, glaciers and more domes • Most recent activity 1914-1917

  2. June 14, 1914 One of more than 150 steam-blast (phreatic) eruptions

  3. May 14th dome May 19th flow

  4. May 19th flow

  5. approximate lahar path

  6. Great mud flow and flood from May 19, 1915 eruption

  7. Photo taken during the morning of May 22, 1915

  8. May 22, 1915 late afternoon

  9. Before 1915 mud and pyroclastic flows

  10. After 1915 mud and pyroclastic flows

  11. May 19th lava flow removed Mudflows

  12. Mud flow and flood from May 19, 1915 eruption I’ll be back.

  13. After horizontal blast and pyroclastic flow I told you I’d be back.

  14. October 1915

  15. Fumaroles, mud pots, and hot springs

  16. Sulphur Works

  17. Sulphur Works

  18. Bumpass Hell

  19. Bumpass Hell

  20. Devil’s Kitchen

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