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教材中说:对机械波来说,波速是由介质决定的.教材中又说:地震波是机械波!地震波中既有横波又有纵波.当地震波中的横波和纵波在同一种介质(地球)中传播时,为什么速度不一样呢?事实上纵波的速度大于横波的速度.地震发生时,由震源向四周传播的弹性波,称为地震波,地震波分为纵波、
According to the textbook, for mechanical waves, the wave speed is determined by the medium. The textbook also states that seismic waves are mechanical waves and that both the transverse waves and the longitudinal waves are present in seismic waves. When the transverse waves and longitudinal waves in seismic waves propagate in the same medium (earth) Why is the speed different? In fact, the speed of the longitudinal waves is greater than the speed of the shear waves. When the earthquake occurs, the elastic waves that propagate from the source to the surroundings are called seismic waves. The seismic waves are classified as longitudinal waves.