Resumen
This paper studies the propagation of pulse-like solutions of semilinear hyperbolic equations in the limit of short wavelength. The pulses are located at a wavefront :={=0} where satisfies the eikonal equation and d lies on a regular sheet of the characteristic variety. The approximate solutions are uapprox= U (t, x, (t, x)/) where U (t, x, r) is a smooth function with compact support in r. When U satisfies a familiar nonlinear transport equation from geometric optics it is proved that there is a family of exact solutions uexact such that uapprox has relative error O () as 0. While the transport equation is familiar, the construction of correctors and justification of the approximation are different from the analogous problems concerning the propagation of wave trains with slowly varying envelope