At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself.Lucky for San Fancisco,these pressure pulses(脉冲) traveled alway from the city duffng the 1906 event.As bad as the damage was,it could have been farWorse.
Looking ahead,scientists are trying to predict when the next major quake will occur.Records show that earthquakes were common before 1906 event. Since then,the area has been relatively quiet.Pattems in the data,however,suggest that the probability of a major earthquake striking the bay area before 2032 is at least 62 percent.
New buildings in san Francisco are quite safe in case of future quakes.Still,more than 84 percent of the citys buildings are old and weak.Analyses suggest that another massive earthquake would cause extensive damage.
People who live there today tend to feel safe because San Francisco has remained pretty qmet for a while.Accoeding to the new research,however,its not a matter of whether the big one will hit. Its just a matter of when.
16. The San Francisco area is located above several active fault lines.
A.right
B.wrong
C.not mentiond
17.The 1906 earthquake in San Francisco is the most severe one in American history.
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