CT理论与应用研究2026，Vol.35Issue(5)：830-838,9.DOI:10.15953/j.ctta.2025.243
地震计方位角偏差校正方法对剪切波分裂结果的影响
Influence of Seismometer Orientation Misalignment Correction Methods on Shear Wave Splitting Analysis
摘要
Abstract
Seismometer orientation misalignment significantly affects the accuracy of shear wave splitting measurements;however,the reliability of different correction methods still requires systematic verification.Taking the MW7.0 earthquake that occurred on September 1,2016,off the east coast of North Island,New Zealand and recorded at station 8H.EP02 in the Pamir Plateau as a case study,five methods were adopted for seismometer orientation misalignment correction:global minimum transverse energy,multi-event P-wave polarization analysis,P-wave principal component analysis,Rayleigh surface wave correlation,and long-period particle motion.This study compares the impacts of different methods on shear wave splitting parameters(fast wave polarization direction and delay time).All five methods effectively determined the seismometer orientation misalignment with maximum differences not exceeding 4°;the differences in time delay results obtained using different methods were small,within 0.01 s;the differences in fast-wave polarization directions did not exceed 3°.Further systematic tests using an orientation misalignment of±20° revealed that the global minimum transverse energy and multi-event P-wave polarization analyses achieved optimal performance.Considering calculation accuracy and efficiency,the multi-event P-wave polarization analysis method should be prioritized in practical applications.These findings underscore the importance of seismometer misorientation correction in shear wave splitting studies for reliable anisotropy characterization.关键词
地震各向异性/剪切波分裂/地震计方位角偏差Key words
seismic anisotropy/shear wave splitting/seismometer orientation misalignment分类
天文与地球科学引用本文复制引用
琚长辉,张永仙,纪志伟..地震计方位角偏差校正方法对剪切波分裂结果的影响[J].CT理论与应用研究,2026,35(5):830-838,9.基金项目
国家重点研发计划青年科学家项目(2024YFF0809500) （2024YFF0809500）
中国地震局地震预测研究所基本科研业务费专项(CEAIEF2026030101). （CEAIEF2026030101）
