新疆TASTE台阵拾震器方位角标定及其对SKS波分裂测量的影响  

Calibrations of Sensor Misorientation Angles for TASTE in Xinjiang and Its Influence on Measurement of SKS Wave Splitting

作　　者：毛鹏宇 叶勃 陈永顺[1,2] 盖增喜 MAO Pengyu;YE Bo;CHEN Yongshun;GE Zengxi(School of Earth and Space Sciences,Peking University,Beijing 100871;Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055)

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]南方科技大学海洋科学与工程系,深圳518055

出　　处：《北京大学学报（自然科学版）》2024年第5期822-838,共17页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：中国科学院战略性先导科技专项(B类)(XDB18000000)资助。

摘　　要：在对塔里木岩石圈地震台阵(TASTE)的66个宽频带流动台站数据进行严格约束基础上,利用3种国际上常用的方法——P波主成分分析法、P波切向最小能量法和Rayleigh波相关系数法,实现地震仪的拾震器方位角标定。3种方法得出的结果具有较高的一致性(相关系数介于0.64~0.91之间),通过综合分析确定最终的地震仪拾震器方位角。其中62个台站地震仪的拾震器方向较稳定,且所有台站均没有出现南北反向、拾震器方位角随时间推移而发生系统性变化的情况。通过与磁偏角对比,发现有40个台站地震仪的拾震器方位角位于磁偏角的±3°范围内,说明TASTE台阵受到的外部干扰较小,台站部署质量较高。通过两个SKS波分裂实例,评估拾震器方位角对SKS波分裂测量产生的影响,论证了在地震学中进行拾震器方位角标定的必要性。Based on the rigorous constraints on the data from the 66 broadband transportable stations of the Tarim seismic array for the lithospheric signature of mantle plume(TASTE),the calibrations of the sensor misorientation angles were achieved by three internationally commonly used methods—P-wave principal component analysis method,transverse P-wave energy minimization method and Rayleigh-wave correlation coefficient method.The results obtained from these three methods demonstrated remarkable consistency with correlations ranging from 0.64 to 0.91.Following the integration analysis,the final sensor misorientation angles were established.Among the stations,62 stations exhibited relatively stable sensor orientations.None of the stations showed evidence of northsouth reversals,nor did their sensor misorientation angles display systematically time-dependent variations.When compared with magnetic declination,it was observed that the sensor misorientation angles of 40 stations fell within±3°of the magnetic declination.This suggests that the TASTE network experiences a low level of external interference,thereby ensuring the high quality of the station deployment.Two examples of SKS wave splitting were used to evaluate the influence of sensor misorientation angles on shear wave splitting measurements.The necessity of calibrating sensor misorientation angles in seismology was demonstrated.

关 键 词：塔里木盆地 拾震器方位角 P波主成分分析法 P波切向最小能量法 Rayleigh波相关系数法 磁偏角 SKS波分裂 

分 类 号：P631.4[天文地球—地质矿产勘探]