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《Chinese Journal of Geophysics》 2008-05
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Possibility of automatically picking first arrival of microseismic wave by energy eigenvalue method

YE Gen-Xi1,JIANG Fu-Xing1,YANG Shu-Hua21 State Key Laboratory of High-Efficient Mining and Safety of Metal Mines,Ministry of Education,Beijing 100083,China2 School of Information Engineering,University of Science and Technology,Beijing 100083,China  
Picking the first arrival of microseismic(MS)wave is a frequently discussed issue in data processing,and also the most important basis of automatic source location.Through analysis and description of different patterns of first arrival point,and also through comparison of variation value against different window lengths,a method of automatically controlling the range and width of time-window was put forward,together with corresponding parameters.With the development of pattern recognition theory,a simple but effective systematic method was developed to improve the stability of picking arrival time,by using classifying,quantitative analyzing and matching.The test results show that the automatically picked first arrivals approximate to the manually picked ones as long as SNR is high,but when SNR of MS wave is low or the first arrival point of MS wave is ambiguous,the automatically picked results are inaccurate.It also shows that if the amplitude ratio between crest amplitude and arrival point amplitude is high,the results from automatic picking are more reliable than those manually picked.
【Fund】: 国家自然科学基金项目(40674017);; 国家留学基金项目(2007年国家建设高水平大学公派研究生项目)资助
【CateGory Index】: P631.4
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