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The Calculation Method of Apparent Emergence Angle of Seismic First-arrival Wave

HE Bin1,ZHANG Yuan-sheng1,LI Wen2(1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China;2.The Geophysical Exploration Center of CEA,Zhengzhou 450002,China)  
In time domain or frequency domain,using displacement,velocity or acceleration of seismic first-arrival wave,the apparent emergence angles are separately calculated.In theory it is proved that calculating apparent emergence angle is not limited by displacement records and time domain.Considering the difference between frequency ranges of interference signal and effective signal,respectively in time domain and frequency domain the apparent emergence angles are calculated,the result shows that the apparent emergence angle in frequency domain basically is equal to the theoretical value,has nothing to do with the azimuth,but the angle has big fluctuation with theoretical value in time domain.It indicates that the apparent emergence angle is less affected by interference signal in frequency domain.Appling the method and using real seismic wave records,the apparent emergence angles of seismic first-arrival wave in some stations are calculated,the results indicate that the apparent emergence angle is more stable and credible in frequency domain than in time domain.
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