Computer animation of operating principles for a seismograph that measures horizontal oscillations of the ground.
Open this file in your web browser to illustrate world plates, locations and depths of earthquakes, and locations of volcanoes.
Open this file in your web browser to see world map of tectonic plates.
Computer animation of the two-block “Earthquake Machine”, a model of the earthquake process using a wood, block, sandpaper, and rubber bands. Connecting two blocks together begins to model interactions between adjacent patches on a fault. The two-block model demonstrates how motion on one area of a fault can increase stress on an adjacent area, bringing it closer to failure in an earthquake. In this animation, the behavior of the two-block model is graphed on a time – versus – strain plot.
Short video segment showing shear (secondary) wave being generated in and traveling across a slinky.
Short video segment of primary (pressure) wave being generated in and traveling across a slinky.
Video lecture on wave motions and speeds of three fundamental kinds of seismic waves: Primary (P = pressure) waves; Secondary (S = shear); and Surface waves.
Video lecture describing speeds and paths of different seismic waves within Earth.
Ross Stein (US Geological Survey) explains how faults rupture during earthquakes.
Short film segment showing a seismograph displaying ground oscillations as the seismic waves from an earthquake arrive.