John Taber and Michael Hubenthal IRIS Consortium

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Presentation transcript:

John Taber and Michael Hubenthal IRIS Consortium Beyond the slinky: Sequencing activities, earthquake visualizations, and demonstrations to enhance student learning of seismic waves John Taber and Michael Hubenthal IRIS Consortium

Let’s Compare

Wave fronts to ray paths – following packets of energy

Slinky Why do seismic waves propagate? What is being transferred by seismic waves? Why no s-waves in outer core?

If you need an elastic spring for waves to travel in a material, where is the spring in the Earth? Why do seismic waves propagate? What is being transferred by seismic waves? Why no s-waves in outer core?

Compressional Wave (P-Wave)

Shear Wave (S-Wave)

Rayleigh Wave

Love Wave

Human Wave

UArray

Magnitude 5.8 VIRGINIA Tuesday, August 23, 2011 at 17:51:04 UTC Courtesy USGS The above map shows the predicted (theoretical) travel times, in minutes, of the first compressional (P) wave from the earthquake across the United States. Movie showing seismic waves crossing the US recorded by the USArray.

Sequence summary Earthquakes: Like ripples on water? How same? How different? Wave fronts to ray paths – 5 slinky model Slinky P, S waves Energy transfer Elastic medium Bendable rock Other Earth materials Silly putty <-> mantle Layers – metal/plastic slinky Human wave USArray visualizations Intro versions Choose a recent earthquake Using data to improve Earth models