earthquakes 101 (eq101)
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Earthquakes 101 (EQ101)](https://reader036.vdocument.in/reader036/viewer/2022081603/56813a03550346895da1ceac/html5/thumbnails/1.jpg)
Lisa WaldUSGS Pasadena
U.S. Department of the InteriorU.S. Geological Survey
USGS Earthquake Hazards Program
Earthquakes 101 (EQ101)
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Global Distribution of Earthquakes
![Page 3: Earthquakes 101 (EQ101)](https://reader036.vdocument.in/reader036/viewer/2022081603/56813a03550346895da1ceac/html5/thumbnails/3.jpg)
Lisa WaldUSGS Pasadena
U.S. Department of the InteriorU.S. Geological Survey
USGS Earthquake Hazards Program
Plate Tectonics
![Page 4: Earthquakes 101 (EQ101)](https://reader036.vdocument.in/reader036/viewer/2022081603/56813a03550346895da1ceac/html5/thumbnails/4.jpg)
Plate Boundaries
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Three Types of Faults
Strike-SlipThrust
Normal
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Strike-slip Fault Example
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Strike-slip Fault Example
1906 San Francisco Earthquake
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Normal Fault Example
Dixie Valley-Fairview Peaks, Nevada earthquakeDecember 16, 1954
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Thrust Fault Example
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Thrust Fault Example
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Bigger Faults Make Bigger EarthquakesBigger Faults Make Bigger Earthquakes
1
10
100
1000
5.5 6 6.5 7 7.5Magnitude
Kilo
me
ters
8
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Bigger Earthquakes Last a Longer TimeBigger Earthquakes Last a Longer Time
1
10
100
5.5 6 6.5 7 7.5 8
Magnitude
Sec
onds
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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
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Is there such a thing as “Earthquake Weather”???
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Earthquake Effects - Ground Shaking
Northridge, CA 1994
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Earthquake Effects -Ground Shaking
Northridge, CA 1994
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Earthquake Effects - Ground Shaking
KGO-TV News ABC-7
Loma Prieta, CA 1989
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Earthquake Effects - Ground Shaking
Kobe, Japan 1995
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Earthquake Effects - Ground Shaking
Kobe, Japan 1995
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Earthquake Effects - Surface Faulting
Landers, CA 1992
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Earthquake Effects - Liquefaction
Source: National Geophysical Data Center
Niigata, Japan 1964
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Earthquake Effects - Landslides
Turnnagin Heights,Alaska,1964
Source: National Geophysical Data Center
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Earthquake Effects - Fires
KGO-TV News ABC-7
Loma Prieta, CA 1989
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Earthquake Effects - Tsunamis
Photograph Credit: Henry Helbush. Source: National Geophysical Data Center
1957 Aleutian Tsunami
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Seismic Waves
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Earthquake Magnitude
M5
M6
M7
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Earthquake Location
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The San Andreas Fault
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Pacific-North American Plate Boundary
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Will California eventually fall into the ocean???
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Faultsof SouthernCalifornia
Source: SCEC Data Center