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Next: Calculation of the P-S Up: ESTIMATION OF SEPARATION PARAMETERS Previous: S-wave separation

P-S wave separation

To estimate the P-S separation coefficients I use a different type of objective function. The energy in the P-s and S-p panels is not a suitable measure because we expect to observe converted waves with significant amplitudes.

A human looking at a gather containing P and S waves often uses the moveout of the events to discriminate between then. With this in mind I have chosen to use an objective function that is calculated in constant velocity stack space. If a section contains only upcoming P waves we would expect to see significant amplitudes at P-p and S-p velocities but none at S-s velocities. A section containing only upcoming S-waves should only have energy at S-s and P-s velocities.

To use this separation procedure a set of velocity ``corridors'' must be defined. These corridors define the regions in time/velocity space in which the different event types are expected to occur.

There are several possible objective functions that can be used to estimate the best separation parameters.


previous up next print clean
Next: Calculation of the P-S Up: ESTIMATION OF SEPARATION PARAMETERS Previous: S-wave separation
Stanford Exploration Project
12/18/1997