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著名的地震学家б·б·伽里清曾经讲过:“可以把每个地震比着一盏灯,它燃着的时间很短,但照亮着地球的内部,从而使我们能够观察到那里发生了什么…….”很早就有人推测,当地震波通过一个即将发生大震的震源区时,由于应变在该处的积累,其波速会有所变化,后来被许多地震学家的观测所证实.所以,从已发生过的天然地震(或人工地震〕的波速比来研究和预报今后可能发生的地震,引起了地震工作者的注意.
The famous seismologist Gabriel Garrett once said: “It is possible to compare each earthquake with a lamp that burns for a short time, but illuminates the interior of the Earth so that we can observe What happened there ... ”It has long been speculated that when a local shock passes through a source region that is about to undergo a major earthquake, the wave velocity changes due to strain accumulation there and was later observed by many seismologists Therefore, it is of great significance to the earthquake workers to study and predict the possible future earthquakes from the wave velocities of natural earthquakes (or artificial earthquakes) that have occurred.