8. Consider that the 1906 for a magnitude 8.5 destructive) Compare this rate to

Question

8. Consider that the 1906 for a magnitude 8.5 destructive) Compare this rate to the one just calculated the am San Francisco Earthquake resulted in 5 meters of displacement arhqake (very destructive). One quake, 5 meters of movement. in question 3. Considering the differences in ount of displacement from this single earthquake vs. the average rate of movement, should the residents of S. Cal. worry about additional BIG earthquakes? How many earthquakes of 5 meters displacement are required to produce the entire 420 km of displacement seen over the past 14 million years? 9.

Explanation / Answer

8. The average rate of movement of plates are about 4 cm/year

And we can see that during earthquake the movement is 5 meters in some seconds which is equivalent of 500,000 cm in few seconds. Such a high rate of movement can cause severe damanges to the buildings, dams and other structures and hence the residents of S.Cal. should be worried abouth these types of earthquakes.

9.

Number of earth quakes needed for displacing 420 kilometer = (420 x 1,000)/5 {since there are 1000 meters in 1 kilometer}

= 420,000/5

= 84,000 earthqaukes

Therefore we need 84,000 earthqauke to produce a net movement of 420 kilometers.

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