Environmental Geology Lecture - Seismology, the science of elastic waves and earthquakes.

What are seismic waves and what information can obtained from their study?

IRIS Consortium information.

Definition of elastic deformation.

Character of seismic waves:

Seismometers: pendulums, dead weights and springs, seismic networks and computers.

Sources of seismic events:

Elastic rebound model for earthquakes: creep vs. stick-slip behavior, the seismic 'cycle' for stick-slip motion as storage and release of elastic energy, the focus (hypocenter) as where the tear started and the epicenter.

Where was the earthquake located? Triangulation from P vs. S wave delay times. Virtual seismology link.

How to measure the size of an earthquake?

How did the earth move? First motion studies, and the pattern of first ground motions as a function of fault geometry and slip direction.

Using elastic waves to image the earth: reflection and refraction events.

What determines the size of an earthquake?

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