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Processing flow

We processed the raw data records with the following steps:
1.
Notch-filtering to remove spectral spikes (e.g. 60 Hz noise).
2.
Sort into (x,y,t) cube.
3.
Zero pad x and y-axes.
4.
3-D autocorrelation or spectral factorization Rickett and Claerbout (2000).
5.
Stack over record axis.
6.
Stack over radius (distance from zero spatial lag).
7.
Low-pass filter to 30 Hz.
8.
Offset dependent gain correction [$d'(h_i)=h_i \, d(h_i)$] for display purposes.


Stanford Exploration Project
4/29/2001