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《Seismology and Geology》 1982-02
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CHARACTERIZED GROUND WATER ANOMALIES PRIOR TO THE MAJOR SHOCKS AND THEIR PHYSICAL MECHANISM

Feng Xuecai(Lanzhou Institute of Seismology, National Bureau of Seismology)  
The characteristics shared by the ground water anomalies prior to the major shocks occurring in China indicate that the areas of anomalies distribution show a ellipse and four quadrants with a major axis concordant with the seismogenic structures and the iso-seisms. At the magistoseismic area and both ends of it, the changes of anomaly having occurred somewhat late come to a maximum values. For the surroundings of the magistoseismic area the peak of anomaly arising earlier decreases gradually. The change of anomaly shows a tendency to extend gradually toward the epicenter from the surroundings; it goes with an interval, to result in a few of clusters of peaks.We have presented some empirical regularities to determine the epicenter, magnitude, time of earthquake occurrence and the depth of hypocenters in terms of these characteristics in question. It is of practical significance in telling the disturbances from the seismic anomalies. The writer assumed that the predisplacements prior to the quake and the interlayer decoupling are the cause of the ground water anomalies by which the physical process for the development of ground water anomalies may be interpreted. The parameters for the ground water anomalies and the differences in the presence of hydro-geological background have been analyzed by the two mechnisms.
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【References】
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【Co-citations】
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1 CHEN Wen-hua, MEN Fu-lu ( Civil Engineering Department. Northern Jiaotong University, Beijing 100044, China; Institute of Engineering Mechanics. China Seismological Bureau, Harbin 150080. China);Study on FEM to simulate slip and seismic liquefaction of slope-field by theory of two phased dynamics[J];Earthquake Engineering and Engineering Vibration;2002-01
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