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

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Presentation on theme: "U.S. Department of the Interior U.S. Geological Survey USGS Earthquake Hazards Program Earthquakes 101."— Presentation transcript:

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

2 Global Distribution of Earthquakes

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

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”???

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 KGO-TV News ABC-7 Loma Prieta, CA 1989

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 Turnnagin Heights,Alaska,1964 Source: National Geophysical Data Center

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

22 Earthquake Effects - Tsunamis

23 Seismic Waves

24 Earthquake Magnitude M5 M6 M7

25 Earthquake Location

26 The San Andreas Fault

27 Faults of Southern California Source: SCEC Data Center

28 Shaking Hazard in Southern California

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

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