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Earthquakes 101

Earthquakes 101. USGS Earthquake Hazards Program. U.S. Department of the Interior U.S. Geological Survey. Global Distribution of Earthquakes. Plate Tectonics. USGS Earthquake Hazards Program. Lisa Wald USGS Pasadena. U.S. Department of the Interior U.S. Geological Survey.

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Earthquakes 101

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  1. Earthquakes 101 USGS Earthquake Hazards Program U.S. Department of the Interior U.S. Geological Survey

  2. Global Distribution of Earthquakes

  3. Plate Tectonics USGS Earthquake Hazards Program Lisa Wald USGS Pasadena U.S. Department of the Interior U.S. Geological Survey

  4. Plate Boundaries

  5. Three Types of Faults Strike-Slip Reverse Normal

  6. Strike-slip Fault Example

  7. Normal Fault Example Dixie Valley-Fairview Peaks, Nevada earthquake December 16, 1954

  8. Reverse Fault Example

  9. Bigger Faults Make Bigger Earthquakes

  10. Bigger Earthquakes Last a Longer Time

  11. What Controls the Level of Shaking? • Magnitude • Amount of energy released • Distance • Shaking decreases with distance • Local soils • Amplify or absorb the shaking

  12. Is there such a thing as “Earthquake Weather”??? No!

  13. Earthquake Effects - Ground Shaking Northridge, CA 1994

  14. Earthquake Effects -Ground Shaking Northridge, CA 1994

  15. Earthquake Effects - Ground Shaking Kobe, Japan 1995

  16. Earthquake Effects - Ground Shaking Loma Prieta, CA 1989 KGO-TV News ABC-7

  17. Earthquake Effects - Ground Shaking Japan 2011

  18. Earthquake Effects - Surface Faulting Landers, CA 1992

  19. Earthquake Effects - Liquefaction Sendai, Japan, 2011

  20. Earthquake Effects - Landslides Source: National Geophysical Data Center Turnnagin Heights,Alaska,1964

  21. Earthquake Effects - Fires Loma Prieta, CA 1989 Japan 2011

  22. Earthquake Effects - Tsunamis

  23. Seismic Waves

  24. Earthquake Magnitude M5 M6 M7

  25. Earthquake Location

  26. The San Andreas Fault

  27. Faultsof SouthernCalifornia Source: SCEC Data Center

  28. Shaking Hazard in Southern California

  29. USGS Earthquake Hazards Program U.S. Department of the Interior U.S. Geological Survey Where to go for more information: http://earthquake.usgs.gov/

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