Okada s (1992) elastic half-space theory is applied to calculate the surface displacement and the amount of differential displacement produced by buried active faults.

Influence of non-active concealed fault to seismic response of structure;

During the preparative and mining process of fully mechanized coal mining face, meeting small fold is a premonitor that there may be concealed fault around the face.

In order to eliminate the practical problems due to the predication of concealed faults during coal excavation, the paper presents a comprehensive way to forecast faults concealed in mining fields, based on fuzzy mathematics and mining geology.

Measurable forecast of buried fault in front of mining roadway;

The paper presents some application examples of detecting buried faults with near-surface seismic methods i.

For acquiring the properties and activity of the buried fault under the loose overburden in some large cities,the faults in depth from tens metres to two kilometers have been explorated by use of reflection-seismic prospecting method and combining the data in deep and shallow strata and the properties of the faults and the relations between deep faults and shallow faults are determined.

Based on prosrecting hidden fault for the substation of 22 ten thousand volt inLan Nan County,He Bei province,we have given the method of observation and interpreta-tion method to apply shallow seismic prospecting with high resolution to detecting activefault.

Prospecting test of hidden faults and layer division was carried out by using joint exploration method of shallow seismic refraction and reflection waves at the bridge seat of Shuhe River along Beijing—Shanghai Expressway.

In this paper,it firstly introduces the principle,instrument and equipment and data processing of EH-4 electromagnetic system,and then introduces its application effect to exploration in deep and large hidden fault surrounding a reservoir,lastly several advantages of the system are summarized.