2015考研英语阅读地震学与海啸_大学英语阅读

　　If the epicentre is on the seabed, that also lifts the water above the bed, creating a wave.

　　如果震中位于海底，板块运动带动上方海水起伏，形成波浪。

　　However, the size of this wave varies with the nature of the uplift.

　　波浪大小因板块隆升性质而定。

　　For tsunami-generating purposes, earthquakes can generally be divided into two sorts.

　　按照是否引发海啸，地震可分两类。

　　Deep ones generate small or non-existent tsunamis because their uplifting effects areabsorbed by the overburden.

　　一是深震，隆升通常被表层所吸收，因此不引发海啸或只引发小型海啸。

　　Shallow ones, whose full crust-displacing force is felt at the surface, are the danger.

　　二是浅震，由于地表震感强烈，因此也更危险。

　　The problem is deciding which is which.

　　当前的问题是如何区分这两者。

　　Once all the data are in, an earthquake s depth can be worked out with reasonableaccuracy.

　　只要有全面的数据，则可较精准地测算地震的深度。

　　But that takes time.

　　然而，这一过程需花费一定时间。

　　The recent Japanese quake, for example, was thought initially to have happened 83kmdown.

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