What is the asthenosphere?
There are many misconceptions about the asthenosphere. This classroom demonstration on the viscoelastic properties of the asthenophere region of Earth's mantle below the lithospheric plates. Silly Putty is used as a model to show how the asthenosphere is elastic when exposed to short-duration forces (like seismic waves) but plastic when exposed to long-duration forces (like the load of the Hawaiian Islands on the Pacific Plate). Lecture by Dr. Robert Butler, University of Portland, Oregon.
Classroom activity is included.
- is not liquid
- is viscoelastic: elastic under short-term stress and/or flows with long-term stress
- silly Putty is viscoelastic