An irregular boundary scatters waves refracted along it, acting as a low-pass filter. This effect is similar to that produced by refraction along an intermediate velocity layer or by a linear-gradient transition zone. Such scatter could explain why reflections from the Mohorovicic discontinuity are hard to record. If this is the case, they should be easier to record if frequencies above 5 cps are filtered out of the seismogram.

First Page Preview

First page PDF preview
You do not currently have access to this article.