26 - 01:05 NorthridgeEQMagnitude6.7blindthrustfault

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01:05 Northridge EQ – Magnitude 6.7 –blind thrust fault 1971 San Fernando EQ – Also Magnitude 6.7 Seismic Waves 1) Passage of these seismic waves cause all the damages in EQs 2) Analyzing waves in detail, can tell us what happened during an earthquake 3)By looking how these waves travel, we can explore the interior of the earth  Definitions Waves - SEE DIAGRAM 1 Notice amplitude, wave length (lambda),  Period (T) = crest to crest Period of ocean waves is about 15-20 seconds Frequency of a Wave    f = 1 /T Measured in cycles per second AC current (alternating current) is about 60 Hz   A Hertz = 1 Cycle/Sec Velocity = V V = (frequency)(wavelength)  Measured in km/sec Why do we have waves in the ocean? Weather Atmospheric pressure differences, wind
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The motion of the waves are only couple 10s meter, deeper than that you don’t  feel waves  Tsunami:
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26 - 01:05 NorthridgeEQMagnitude6.7blindthrustfault

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