本文的目的是促使人们注意波在耗散性各向异性介质与纯弹性各向异性介质中传播时的一些差别。在弹性介质中,波前定义为使平面波相位为零的一组平面的包络线。业已证明,这一定义与由群速度和能量速度求得的波前一致,也就是说,这三个概念是等价的。然而,对耗散性各向异性介质中传播的平面波而言,这些概念是不同的。尽管存在着这些差别,平面波包络线的速度仍接近能量速度,因此从实用观点出发,它可以代表波前。另一方面,只有当衰减相对低时,即Q值大于100时,群速度才能够描述波前。不同速度值以及波 The purpose of this paper is to draw attention to some of the differences between waves propagating in dissipative anisotropic media and in purely elastic anisotropic media. In elastic media, the wavefront is defined as a set of planar envelopes that zero the plane wave phase. It has been shown that this definition is consistent with the wavefront determined from the group velocity and the energy velocity, that is, the three concepts are equivalent. However, these concepts are different for plane waves propagating in dissipative anisotropic media. Despite these differences, the plane wave envelope is still close to the energy velocity, so it can represent the wavefront from a practical point of view. On the other hand, the group velocity can describe the wavefront only when the attenuation is relatively low, ie, the Q value is greater than 100. Different speed value and wave