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

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Earthquakes 101 eq101
Earthquakes 101 (EQ101)

USGS Earthquake Hazards Program

Lisa Wald

USGS Pasadena

U.S. Department of the Interior

U.S. Geological Survey



Plate tectonics
Plate Tectonics

USGS Earthquake Hazards Program

Lisa Wald

USGS Pasadena

U.S. Department of the Interior

U.S. Geological Survey



Three types of faults
Three Types of Faults

Strike-Slip

Thrust

Normal



Strike slip fault example1
Strike-slip Fault Example

1906 San Francisco Earthquake


Normal fault example
Normal Fault Example

Dixie Valley-Fairview Peaks, Nevada earthquake

December 16, 1954






What controls the level of shaking
What Controls the Level of Shaking?

  • Magnitude

    • More energy released

  • Distance

    • Shaking decays with distance

  • Local soils

    • amplify the shaking




Earthquake effects ground shaking1
Earthquake Effects -Ground Shaking

Northridge, CA 1994


Earthquake effects ground shaking2
Earthquake Effects - Ground Shaking

Loma Prieta, CA 1989

KGO-TV News ABC-7





Earthquake effects liquefaction
Earthquake Effects - Liquefaction

Source: National Geophysical Data Center

Niigata, Japan 1964


Earthquake effects landslides
Earthquake Effects - Landslides

Source: National Geophysical Data Center

Turnnagin Heights,Alaska,1964


Earthquake effects fires
Earthquake Effects - Fires

Loma Prieta, CA 1989

KGO-TV News ABC-7


Earthquake effects tsunamis
Earthquake Effects - Tsunamis

1957 Aleutian Tsunami

Photograph Credit: Henry Helbush. Source: National Geophysical Data Center








Faults of southern california
Faultsof SouthernCalifornia

Source: SCEC Data Center


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