Article,
Separation of P- and S-waves
Geophysical Prospecting, 33 (7): 970--986 (November 1985)
DOI: 10.1111/j.1365-2478.1985.tb00792.x
Abstract
In combined P- and SV-observations with vertical and in-line horizontal
geophones, recognition and separation of the individual P- and S-arrivals
may form a considerable problem. Due to the geophone receiving characteristics,
P- and S-waves are observed on both horizontal and vertical geophones.
A new method of separating P- and S-waves is presented that inverts
the geophone records for the receiving characteristics, thereby separating
the two wavetypes. The filter coefficients are determined from the
near-surface P- and S-wave velocity and from the geometry of the
geophone groups. The P/S-separation filter was tested on synthetic
data with good results. Even PS- and SP-converted reflections, which
are completely coinciding for horizontal reflectors, could be well
separated. The filter appears to be stable and to have low sensitivity
to noise in the data or to errors in the near-surface P- and S-wave
velocity. The filter is superior to other separation methods, which
were applied to the same dataset for comparison. This method can
also be applied to VSP data.
