Earthquakes 101 (EQ101) - PowerPoint PPT Presentation

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Earthquakes 101 (EQ101)

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  1. Earthquakes 101 (EQ101) USGS Earthquake Hazards Program Lisa Wald USGS Pasadena 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 Thrust Normal

  6. Strike-slip Fault Example

  7. Strike-slip Fault Example 1906 San Francisco Earthquake

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

  9. Thrust Fault Example

  10. Thrust Fault Example

  11. Bigger Faults Make Bigger Earthquakes

  12. Bigger Earthquakes Last a Longer Time

  13. What Controls the Level of Shaking? • Magnitude • More energy released • Distance • Shaking decays with distance • Local soils • amplify the shaking

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

  15. Earthquake Effects - Ground Shaking Northridge, CA 1994

  16. Earthquake Effects -Ground Shaking Northridge, CA 1994

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

  18. Earthquake Effects - Ground Shaking Kobe, Japan 1995

  19. Earthquake Effects - Ground Shaking Kobe, Japan 1995

  20. Earthquake Effects - Surface Faulting Landers, CA 1992

  21. Earthquake Effects - Liquefaction Source: National Geophysical Data Center Niigata, Japan 1964

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

  23. Earthquake Effects - Fires Loma Prieta, CA 1989 KGO-TV News ABC-7

  24. Earthquake Effects - Tsunamis 1957 Aleutian Tsunami Photograph Credit: Henry Helbush. Source: National Geophysical Data Center

  25. Seismic Waves

  26. Earthquake Magnitude M5 M6 M7

  27. Earthquake Location

  28. The San Andreas Fault

  29. Pacific-North American Plate Boundary

  30. Will California eventually fall into the ocean??? No!

  31. Faultsof SouthernCalifornia Source: SCEC Data Center