earthquakes 8

# earthquakes 8 - Earthquakes 8 October 9 2007 I Moving into...

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Earthquakes 8 October 9, 2007 I. Moving into Earthquakes a. More physics/equations will be involved II. Waves a. Seismic waves: i. Important cuz they cause all the damage in earthquake and also provide means by which to see how interior of earth looks like 1. use them as x-rays b. Definitions; i. See figure one in drawing notes: explaining parts of a wave ii. Figure B: explains that period is the time between successive peaks 1. timing between one wave and next wave iii. Frequency—how many waves go by in given time 1. f= 1 / T a. so its basically the inverse of “period” 2. EX: so if period of a wave is .5 second, then the frequency is 1/.5= 2 i. One cycle / Second = a hertz (hz) iv. Velocity (v) 1. V = Frequncy * Wavelength a. In EQ, use km/ second 2. Frequency = V/ Wavelength i. EX; 800km/hour divided by 200 km = 4 cycles per hour ii. This applies to tsunamis c. Tsunamis (tidal waves) i. Look from shore that a tide is coming in, except that its very tall and fast; hence “tidal wave” 1. tsunamis are not driven by wind like tides are a.

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