Suryya K. Sarmah, J. W. Berg; Separation of Surface Reflection from P Pulse Recorded at Teleseismic Distances. Seismological Research Letters ; 37 (2): 23–27. doi: https://doi.org/10.1785/gssrl.37.2.23
A method is described whereby the surface reflections, as well as other pulses, can be extracted from P waves recorded at teleseismic distances from nuclear explosions. The method utilizes the fact that the initial portion of the P wave is pure and subtracts this portion by successive addition (subtraction) from later parts of the P wave. Examples of separation are given for three nuclear explosions detonated in Nevada and New Mexico and recorded at Mould Bay, Canada.