An animation which illustrates how the travel time of an earthquake is measured. What alters the velocity of the waves? [1:06]

Watch how natural hazards occur, how they affect our lives and what we can do to prepare for and mitigate their effects. [4:27]

Watch a river change its course and even flow backward. An animated earthquake shows what happens to the water in a river and possible effects of the surrounding area.

A brief video will illustrate how a ping announces refracted seismic waves. [0:34]

A brief animation which illustrates how a horizontal seismograph works. A seismograph measures wave activity. [0:19]

This short clip will illustrate how a seismograph measures vertical motion in the Earth. [0:14]

A "quick" slow motion clip illustrates how a seismograph measures the vertical motion of S and P waves. [0:13]

Find the connection between earthquakes and volcanoes. This clip will illustrate volcanic earthquakes. [1:44]

Researchers at the state-of-the-art Structural Engineering and Materials Laboratory at the Georgia Institute of Technology are using a full-scale model building to test new ways to protect structures from earthquakes and potentially save...

Nice, visual animation showing what happens under the Earth's surface at a divergent boundary.

This captioned animation describes the elastic rebound effect, which happens as a result of an earthquake.

Video lecture describing speeds and paths of different seismic waves within Earth from an earthquake to a distant seismic station. P & S waves travel through the Earth; Surface waves travel around the perimeter of the Earth. [1:44]

Video lecture on wave motions and speeds of three fundamental kinds of seismic waves: Primary (P = pressure) waves; Secondary (S = shear); and Surface waves. [3:10]

See how travel-time curves are created. [2:52]

See what seismograms look like at increasing distances from the epicenter. [0:21]

See how surface waves and P and S-Waves affect Earth's surface. [0:36]

Scientists have developed far-more sensitive seismometers that, with faster computers, have enabled them to record & interpret a broader spectrum of seismic signals than was possible in the 1930's, when the Richter magnitude was...

Learn how foreshocks and aftershocks are related to the main shocks of earthquakes. [6:32]

This demonstration shows that seismic waves propagate in all directions in the Earth from the source (not just in the direction of a single slinky). [5:13]

See how to model differential friction along a fault. [2:30]

This demonstration explores two of the four (P and S waves) main ways energy propagates from the hypocenter of an earthquake. [8:27]

Learn how Chile's tectonic setting and megathrust earthquake of 2010 is similar to the catastrophic earthquake in Sumatra in 2004 by touching icons on this interactive map.

Find out the motion that is halfway between a normal fault and a strike-slip fault. [0:15]

This demonstration, squeezing uncooked spaghetti noodles in a wood template set in a vise, effectively shows how asperities (stuck patches) on a fault rupture at different times. [1:44]