在纯粹地震学中，地面运动一般以振幅表示。
In pure seismology, the ground motion is generally expressed by its amplitude.
火山与地震都是地球内部物质运动的结果和表现。
Volcano and earthquake are all results of internal material motion.
地震速度是用来测量地壳运动速度的。
Velocity is the measurement of the speed of the ground motion.
岩石运动在地震期间能做河的路线。
Rock movements during an earthquake can make rivers change their course.
可以利用的记录震源附近运动的地震图很少。
Very few seismograms showing motion near to the source are available.
可以利用的记录震源附近运动的地震图很少。
Very few seismograms showing motion near to the source are available.
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