Scripps Institution of Oceanography

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Presentation transcript:

Scripps Institution of Oceanography Cyber TEAM Academy 2008 Earth Science Dr. Debi Kilb Scripps Institution of Oceanography

What’s the difference between a “Seismograph” and a “Seismogram”? Seismograph: The instrument (Apparatus to measure and record vibrations) Seismogram: The actual wiggle (Record of an Earth tremor recorded by a seismograph)

Seismic Waves fault ‘snaps’ energy ripples

3 Main Earthquake Waves P waves (compressional) 6-8 km/s. Particle motion is parallel to direction of propagation; also called primary waves. S waves (shear) 3-5 km/s. Particle motion is perpendicular to direction of propagation; also called secondary waves. Do not pass through liquids. Surface waves (surface) < 3-4 km/s. Waves that travel around the Earth at the surface. Seismograph

Types of Seismic Waves Seismograph

Ground Motions P Waves S Surface Waves

epicenter of an earthquake

http://projects.cs.csusm.edu/maps/quakesDemoMode.html