虚拟速度—临界角谱是地震折射波虚拟射线理论的应用之一。根据共始点或共折射点记录的相似性,利用第一虚拟时距曲线方程,对时距曲线进行扫描计算,可以制作共始点谱和共折射点谱。 文中,通过实际介质模型的计算机试算结果,对该方法作了验证。 Virtual velocity-critical angle spectrum is one of the applications of the theory of virtual ray of seismic refraction wave. According to the similarity recorded at the common starting point or the common refractive point, the first virtual time-distance curve equation can be used to scan and calculate the time-distance curve so that the common-start point spectrum and the common-refraction point spectrum can be made. In this paper, this method is validated by the computer trial of the actual medium model.