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U.S. Geological Survey Open-File Report 2010-1173

Caldera Demonstration Model

By Dina Venezky and Stephen Wessells


Thumbnail of Dina in her lab

A caldera is a large, usually circular volcanic depression formed when magma is withdrawn or erupted from a shallow underground magma reservoir. It is often difficult to visualize how calderas form. This simple experiment using flour, a balloon, tubing, and a bicycle pump, provides a helpful visualization for caldera formation.

(click on the title page to start the video)

  • Sound only with alternative text added, for the visually impaired (MP3, 1.9 MB)
  • Transcript, for the hearing impaired (html, 56 kB)
  • This report is available only on the Web.

For additional information:
Contact LVO
Volcano Science Center, Long Valley Observatory
U.S. Geological Survey
345 Middlefield Road, MS 910
Menlo Park, CA 94025

This report is presented in MP4 format; the latest version of Apple QuickTime or similar software is required to view it. Get QuickTime (free download) to view this movie.

Suggested citation:

Venezky Dina, and Wessells, Stephen, 2010, Caldera demonstration model: U.S. Geological Survey Open-File Report 2010-1173 (video).

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