Earthquakes!! Shake, Rattle and Roll.

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Presentation transcript:

Earthquakes!! Shake, Rattle and Roll

Earthquake Video

Earthquakes Earthquakes are the rapid shaking of the lithosphere at faults, caused by the release of the potential energy stored in the rock layers. Focus Epicenter Seismic Waves P-waves S-waves

Click Map for Link to USGS Website

Click Map for Link to USGS Website

Elastic Rebound Hypothesis

Elastic Rebound To view this animation, click “View” and then “Slide Show” on the top navigation bar.

Earthquakes The focus is the point of stress relief in an earthquake (the point inside Earth). The epicenter is the location directly above the focus on Earth’s surface.

Focus, Epicenter, and Fault

Seismic Waves P-waves S-waves Primary seismic waves that travel fastest after an earthquake Arrive first Known as compression waves (push and pull motion) Movement is in the direction of wave motion (slinky) S-waves Secondary seismic waves that travel slower after an earthquake Arrive second Known as transverse waves (shaking up and down motion) Movement is perpendicular to the direction of motion (slinky)

Seismic Waves

Earthquake Waves To view this animation, click “View” and then “Slide Show” on the top navigation bar.

Seismic Wave Animation

Seismic Wave Motion To view this animation, click “View” and then “Slide Show” on the top navigation bar.

Seismograph An instrument that measures seismic waves and records them

Seismogram

Seismographs To view this animation, click “View” and then “Slide Show” on the top navigation bar.

Locating an Earthquake Epicenter

ESRT p. 11

Earthquake Magnitudes

Emergency Planning Death and injury from earthquake damage can be greatly reduced with proper planning. Remember: Drop, Cover, and Hold Drop down under a strong object Cover your eyes with one hand Hold the strong object with the other hand Earthquakes last 10-30 seconds Practice earthquake drills Have emergency supplies Flashlight w/ extra batteries First Aid

Tsunami Large wavelength wave produced by strong underwater earthquakes in the oceanic crust. As wave approaches shore the height grows and can produce 30 m waves in extreme cases.

Tsunami To view this animation, click “View” and then “Slide Show” on the top navigation bar.