Abstract：Small faults in coalseam are one of the important factors that cause coal mine safety accident. It is an urgent and necessary thing for current coal mine safety to predict exactly small faults in coamseam. General seismic interpretation method is suitable for interpreting the fault over 3 m throw，so it is necessary to find new technical method to interpret faults below 3 m throw in coalseam. Seismic horizon curvature is calculated from 3D seismic interpretation horizon and reflects the curving degree to the given horizon at a point. The calculation of seismic horizon curvature is based on the girding horizon，and it is realized through the coefficient of structure surface fitting equation. Curvature attribute of coalseam reflects curving degree of horizon when coalseam was extruded by structure stress. Coalseam faults below 3 m throw on general seismic section have the features such as even tiny variety，twist，weaking abruptly of the amplitude，these tiny varieties show small linear structure on the seismic horizon curvature attribute，so small faults can be predicated according to linear structure abnormity. The length of abnormity and directions represent the continued length and directions of faults respectively. The case shows that predicting small faults with seismic horizon curvature can raise fault interpretation efficiency.
