1. A method of processing three component seismic data, comprising: a) determining a covariance data matrix from three component seismic data for each of a plurality of time periods to obtain eigenvectors and eigenvalues; b) calculating, from the eigenvectors and eigenvalues, a seismic attribute for each of the plurality of time periods; c) determining a stability measure from the calculated seismic attribute for each of the plurality of time periods; and d) storing the stability measure in a form for display.