江苏省测震台网井下地震计方位角检测  

Borehole Seismometer Azimuth Detection in Jiangsu Seismic Network

作　　者：宫杰[1] 张朋 张扬[1] 张敏 王佳 居海华[1] Gong Jie;Zhang Peng;Zhang Yang;Zhang Min;Wang Jia;Ju Haihua(Jiangsu Earthquake Administration,Nanjing 210014,China;Jiangsu Guanyun seismic station,Lianyungang 222200,Jiangsu,China)

机构地区：[1]江苏省地震局,南京210014 [2]江苏省灌云地震台,江苏连云港222200

出　　处：《震灾防御技术》2022年第1期181-187,共7页Technology for Earthquake Disaster Prevention

基　　金：江苏省地震局青年科学基金项目(201902);徐州市重点研发计划(社会发展)项目(KC20185);地震科技星火计划(XH21011)。

摘　　要：为获取江苏省测震台网井下地震计精确方位角,架设地面参考地震计,将其精确指北,并与井下地震计检测结果进行对比,利用相关分析法计算22个深井台站精度较高的方位角。研究结果表明,受多因素制约,井下地震计检测结果普遍偏差较大,部分台站水平向分量几乎反向,如提井,需重新进行方位角检测;地面与井下地震计同频带有利于提高相关性,从而获取高精度检测结果;利用不同频带地震计进行井下地震计方位角检测时,对较宽频带地震计进行仿真处理尤为重要;溧阳2台站新建井下地震计检测结果表明相关分析法可应用于井下地震计方位角检测;尽可能选择台基噪声功率谱密度曲线具有明显波峰频段作为滤波频段,有利于提高地面与井下地震计观测数据相关性,提高方位角检测精度。In order to obtain the accurate azimuth angles of borehole seismometer in Jiangsu seismic network,the ground reference seismometer is set up to accurately point north accurately.Comparative observation between ground and borehole seismometer has been done.Accurate azimuths of 22 borehole seismometers were obtained,and we draw the following conclusions:The azimuth angle devi-ations of borehole seismometer are generally large due to the restriction of many factors,and the horizontal components of some sta-tions are almost reversed.Remount of borehole seismometer must changes the azimuth,so the azimuth detection must be carried out again.The same frequency band between ground and borehole seismometers is beneficial to improve the correlation and obtain higher precision detection results.The comparison observation of different frequency band seismometers needs to be simulated.Azimuth detec-tion of Liyang 2 borehole seismometer proves that the correlation analysis method is feasible to detect the azimuth of borehole seismo-meter.The frequency band with obvious peak on the power spectrum curve of the background noise is selected as the filtering fre-quency band as far as possible,which is beneficial to improve the correlation between ground and borehole seismometer observation data and improve the accuracy of azimuth detection.

关 键 词：江苏测震台网 井下地震计 方位角检测 相关分析法 P波极性 滤波频段 

分 类 号：P315.7[天文地球—地震学]