Abstract: In this paper, an anomaly intensity is proposed basedon the Fisher statistic quantity, and the anomaly intensity field for deformation is alsocreated in the Southwest China area atdenser monitoring sites. Analy zing the anomaly pattern, the inhomogeneous characteristics and its evolution are discussed under assuming the seismic activity in group. The relation between deformation anomaly-concentrated area (or deformation gap) and seismic gap, and the relation between seismic activity and anomaly intensity field with in and outside the seismic gap are explored.

Key words: Crustal deformation, Anomaly intensity, Strong earthquake, Southwest Chi-na area