Research On Recognition Method Of Earthquake And Mine Earthquake Based On Hegang Area

The accurate identification of natural earthquakes and mine earthquakes in the mining area can provide reference for the determination of natural earthquakes and mine earthquakes events in the monitoring area,quick report of seismic phase and quick report of earthquakes(mine earthquakes).It is of great significance to improve the quality of cataloguing of natural earthquakes and mine earthquakes,to better serve the safety construction of the mining area,the construction of the mining area network and the early warning of secondary disasters in the mining area.This paper takes Hegang area as the research area,based on the natural and mine earthquakes records,gives the basic characteristics(amplitude,frequency spectrum,duration)of earthquakes and mine earthquakes,and compares and analyzes the key characteristic parameters of earthquakes and mine earthquakes identification,such as the first motion direction of P-wave,dominant frequency,Sm/Pm amplitude ratio,and the amplitude to coda duration ratio of S-wave and P-wave,Sm/Tc and Pm/Tc.The results show that the first motion direction of P-wave and the Sm/Pm cannot be used as the distinguishing parameters alone.The dominant frequency,Sm/Tc and Pm/Tc can be used as the distinguishing parameter of identifying earthquakes and mine earthquakes alone.Based on the test method in this paper,the recognition rates of dominant frequency,Sm/Tc,and Pm/Tc are,95.8%,93.7%,91.6% respectively.To further improve the accuracy of identification,by combining dominant frequency,Sm/Tc,and Pm/Tc,this study has proposed a “three-parameter comprehensive identification method” with rate reaches 99.3%,and the recognition effect is very good,which can be used in the engineering practice of specific mining area earthquakes and mine earthquakes recognition.The main research work of this paper is as follows:1.This paper collect and sort out the data of 2006-2017 natural earthquakes and mine earthquakes in Hegang area,select the research data,and carry out baselinecorrection,Fourier transform and instrument response correction and other data processing.2.Based on the processed research data,the amplitude,frequency spectrum and duration of the natural and mine earthquakes in Hegang area are calculated,and the basic characteristics of the natural and mine earthquakes in Hegang area are given,which shows that the basic characteristics cannot meet the requirements of the accurate identification of natural and mine earthquakes.3.Referring to the current situation of identification research at home and abroad,five identification characteristic parameters are optimized,i.e.the first motion direction of P-wave,dominant frequency,Sm/Pm amplitude ratio and S-wave and P-wave amplitude to coda duration ratio,Sm/Tc and Pm/Tc,for calculation and analysis,and the test method is selected to test the identification effect of each identification characteristic parameter.4.Based on the calculation results and test results of the characteristic parameters,three parameters(dominant frequency,Sm/Tc and Pm/Tc)with the best recognition effect are selected as the identification parameters.A new method of identifying natural earthquakes and mine earthquakes-"three-parameter comprehensive identification method" is proposed,and the accuracy of the new recognition method is verified by the actual monitoring waveform in Hegang area.