LECTURE_07_02-04-10_EARTHQUAKES_Chap_3-4

LECTURE_07_02-04-10_EARTHQUAKES_Chap_3-4 - Tectonic Hazards...

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Unformatted text preview: Tectonic Hazards – Plate Tectonics - Earthquakes REVIEW (Chap. 3) – Earthquakes, Energy, and Waves – Earthquakes and Faults THE NEW STUFF (Chap. 3) – Locating/Measuring/Quantifying Earthquakes EARTHQUAKES – Continued/Review REVIEW - P Waves (compresional) • BODY WAVES: P – primary, pressure, “push” • Move through solids and liquids • Arrive first to seismograph ~6.0 km/second Courtesy Kevin Mackey © 2001 W. W. Norton REVIEW - S Waves (Shear) • BODY WAVES: S – Secondary, “shear” • Move through solids not through liquids • Arrive to seismograph after p-wave ~3.5 km/second SURFACE WAVES – NEW STUFF…but not much! • Travel along the Earth’s surface (rather than through the earth like body waves) • Love waves (side-to-side) and Rayleigh waves (up and down) – MOST DESTRUCTIVE of all waves! • Slower than body waves (P and S-waves) and arrive after 2 - 4.5 km/sec LOVE RAYLEIGH High amplitude Low frequency = More motion of houses/structures… DAMAGE Fig. 3-10, p. 40 A seismogram , the record of seismic motions, the shaking of the ground Surface wave Beginning of the earthquake … change in shaking with time Fig. 3-7, p. 39 Wave Properties Amplitude Period = time for one successive wave crest (cycle) to pass Wavelength = distance between wave crests Frequency = number of peaks or cycles per second (Hz) Fig. 3-54, p. 60 Buildings of different height can sway and collide during an earthquake Frequency = number of cycles per second Review Question #1 Based on what you know about (1) the earth’s interior and (2) p and s waves, what types of waves are represented in the picture below? (a) P-waves (b) S-waves Review Question #2 Based on what you know about (1) the earth’s interior and (2) p and s waves, what types of waves are represented in the picture below?...
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This note was uploaded on 11/11/2011 for the course ISP 203 taught by Professor Paquette during the Fall '08 term at Michigan State University.

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LECTURE_07_02-04-10_EARTHQUAKES_Chap_3-4 - Tectonic Hazards...

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