508L12.11.4.07

508L12.11.4.07 - Mechanics of Earthquakes and Faulting 11...

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Mechanics of Earthquakes and Faulting Mechanics of Earthquakes and Faulting 11 Apr. 2007 Earthquake quantification Energy, Moment, Magnitude Scaling laws Corner frequency, Brune Stress drop. Mechanics of Earthquakes
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Earthquakes represent failure on geologic faults. The rupture occurs on a pre-existing surface. Faults are finite features – the Earth does not break in half every time there is an earthquake. Earthquakes represent failure of a limited part of a fault. Most earthquakes within the crust are shallow Definitions of Focus, Epicenter NOTE: Epicenter is also the Rancho Cucamonga Quakes’ stadium –they are single-A team of the Anaheim (LA) Angles: http://www.rcquakes.com/ _____________________________________ Earthquake Size (Source Properties) Measures of earthquake size: Fault Area, Ground Shaking, Radiated Energy Fault dimensions for some large earthquakes: L (km) W (km) U (m) Mw Chile 1960 1000 100 >10 9.7 Landers, CA 1992 70 15 5 7.3 San Fran 1906 500 15 10 8.5 Alaska 1964 750 180 ~12 9.3 N Rup ture area, A Slip contour s, u W L
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Wave resulting from the interaction of P and S waves with the free surface. Their wave motion is confined to and propagating along the surface of the body
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Magnitude is a measure of earthquake size base on: Ground shaking Seismic wave amplitude at a given frequency
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N Rup ture area, A Slip contour s, u W L Magnitude is a measure of earthquake size base on: Ground shaking Seismic wave amplitude at a given frequency Magnitude accounts for three key aspects:
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508L12.11.4.07 - Mechanics of Earthquakes and Faulting 11...

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