Abstract:In the recent studies of seismology and geology, satellite photographic analyses and drilling and geophysical prospection, the author has found that beneath the Guanzhong plain, there are some indications of extensively developed NNE structure. So far as this area is concerned, there are four structural zones with firstclass structural features. They should be the component parts of the Neocathaysian structural system of North China. It is a very active structural system at present, which reforms the antecedent structural plane, affects and controls the development of mophostructure and water system and controls the distribution of seismic actiyities and geothermal anomalous area. The small earthquake activities of this area correspond with the strong earthquake activities occurred in North China in recent years. They may be regarded as the indications of future strong earthquake in North China.
