Abstract
A neural network is described which uses an unsupervised generalized Hebbian algorithm (GHA) to find the principal eigenvectors of the covariance matrix for different types of seismogram. Principal components analysis (PCA) using the GHA network enables the extraction of information regarding seismic reflections and uniform neighboring traces. The seismic data analyzed are seismic traces with 20, 25, and 30 Hz Ricker wavelets. The GHA network is also applied to analyze (a) fault, reflection and diffraction patterns after NMO correction, (b) bright spot patterns, and (c) a real seismogram from the Mississippi Canyon. The properties of high amplitude, low frequency, and polarity reversal are observed from projections on the principal eigenvectors. The GHA network also provides significant seismic data compression.
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