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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)

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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**Plate Tectonics**USGS Earthquake Hazards Program Lisa Wald USGS Pasadena U.S. Department of the Interior U.S. Geological Survey**Three Types of Faults**Strike-Slip Thrust Normal**Strike-slip Fault Example**1906 San Francisco Earthquake**Normal Fault Example**Dixie Valley-Fairview Peaks, Nevada earthquake December 16, 1954**What Controls the Level of Shaking?**• Magnitude • More energy released • Distance • Shaking decays with distance • Local soils • amplify the shaking**Earthquake Effects - Ground Shaking**Northridge, CA 1994**Earthquake Effects -Ground Shaking**Northridge, CA 1994**Earthquake Effects - Ground Shaking**Loma Prieta, CA 1989 KGO-TV News ABC-7**Earthquake Effects - Ground Shaking**Kobe, Japan 1995**Earthquake Effects - Ground Shaking**Kobe, Japan 1995**Earthquake Effects - Surface Faulting**Landers, CA 1992**Earthquake Effects - Liquefaction**Source: National Geophysical Data Center Niigata, Japan 1964**Earthquake Effects - Landslides**Source: National Geophysical Data Center Turnnagin Heights,Alaska,1964**Earthquake Effects - Fires**Loma Prieta, CA 1989 KGO-TV News ABC-7**Earthquake Effects - Tsunamis**1957 Aleutian Tsunami Photograph Credit: Henry Helbush. Source: National Geophysical Data Center**Earthquake Magnitude**M5 M6 M7**Faultsof SouthernCalifornia**Source: SCEC Data Center

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