APPLICATION OF SYNTHETIC GEOPHYSICAL PROSPECTING METHODS TO EVALUATION OF COLLAPSE IN YULIN, FUSHUN

Some geophysical prospecting methods, such as gravimetry, high-precision magnetic measurement, VLF electromagnetometry, electrical sounding and shallow seismic refraction, were used to evaluate the collapse area of Yulin, Fushun. These methods can determine the distribution of faults, underground caves and aquifers. The prospecting result, combined with geologic and geodesic information, may be used to infer and interpret collapses. After a study on the mechanism of collapse and subsidence, the reason for the collapse is concluded, and the potential areas of collapse are pointed out.