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Title:: Borehole Seismometer Horizontal Azimuth Detection by Using Microtremors Data at the Same Station

Author(s):: LI Shaorui; HUI Shaoxing; DONG Pingjiang; (Shaanxi Earthquake Agency,Xi'an 710068,Shaanxi,China)

Keywords:: borehole seismometer; azimuth deviation; waveform correlation; P-wave polarity method

摘要:: 利用波形相关法对地面同台址多套地震计方位角进行对比分析研究,并在江苏盐城、安徽界首、安徽合肥、安徽阜阳、河南航海5个台进行井下地震计方位角对比检测,同时利用远震P波极性法对地面及井下地震计方位角的检测结果进行验证。结果表明:地面观测台站地震计方位角检测中波形相关法、远震P波极性法与陀螺寻北仪检测结果的偏差分别在0.4°、2.9°以内,井下观测台站地震计方位角检测中波形相关法与远震P波极性法检测结果的偏差在5.5°以内。因此,远震P波极性法及波形相关法均可得到较为满意的检测结果。

Abstract:: In this study,a correlation analysis method was used to determine the azimuths obtained from several seismometers deployed at the surface from the same station,and the method was carried out at 5 borehole seismometers deployed in Yancheng,Jiangsu Province,Jieshou,Hefei,Fuyang,Anhui Province,and Hanghai,Henan Province. Meanwhile,we used the teleseism P-wave polarity method to verify the azimuth of the surface and borehole seismometer. The results show that the deviations of the waveform correlation analysis method and teleseism P-wave polarity method from the gyro north seeker detection results in the seismometer azimuth detection of surface seismic stations are within 0.4° and 2.9°, respectively. The deviation between the waveform correlation analysis method and the teleseism P-wave polarity method is within 5.5° in the seismometer azimuth detection of borehole seismic stations. Therefore, both the teleseism P-wave polarity method and the waveform correlation analysis method can obtain satisfactory results.