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STUDY ON THE DISTRIBUTION OF THE FIRST MOTION MARK OF P WAVE BY USING THE SEISMIC SOURCE MODEL OF CRACK CONTAINING HYPERPRES SURE GAS

WANG Zhipei (The Exploring and Designing Institute of Water Conservancy,Power and Building,Mianyang 621000)  
By using the seismic source model of crack containing hyperpressure gas ,the distribution of the first motion mark of P wave is studied.According to the deduction,the cracks containing hyperpressure gas with different inclination can form the distribution pattern in four quadrants of first motion mark of P wave and the nodal lines of P wave in the shape of conic section,such as circle,ellipse,parabola and double curve etc..According to the shape of nodal lines of P wave and type of instability,the earthquakes are classified.The distribution feature of first motion amplitude of P and S waves and the feature of ground deformation etc.deduced correspond with practice.
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