7. Earthquakes are statistically predictable events, Large earthquakes are rare,

Question

7. Earthquakes are statistically predictable events, Large earthquakes are rare, small ones very common. Since most earthquakes have occurred before we were born, we must look at rock displacement to figure out frequent and how big past earthquakes were. In California, the San Andreas Fault shows about 420 kilometers of displacement over a 14 million year time period. Calculate the average rate of moverment in centimeters per year oQuaternary Gan Fr CALIFORNUA Paciic Ocean Salta Barbara Los Angeies 200 lm Figure 9

Explanation / Answer

Total displacement = 420 kilometres = 420* 105 cm

Time period = 14 million year = 14*109 years

Therefore, average displacement = (420* 105 cm)/( 14*109 years)

                                                            = 3*10-3cm per year

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