摘要
旋转分量是地震波场的重要组成部分,可以为地球内部结构成像和震源参数测定等研究提供基础信息,然而缺少高精度的观测仪器,其应用受限.新发展的高精度光纤陀螺为测量旋转分量提供了一个较为可行的方案,其性能需要进一步验证.为此,武汉大地测量国家野外科学观测研究站利用两个光纤陀螺和一个宽频带地震仪组成了多分量观测系统,并开展了观测工作,记录到了云南漾濞地震的Love波信号.基于Love波信号的垂向旋转速度记录和切向加速度记录,开展了Love波视速度和到达方位角度测算分析.结果表明视速度存在明显频散特性,测算值与其他方法测算值相当,到达方位角接近大圆路径预测值,尾波部分到达角偏离较大.由此表明高精度的光纤陀螺可以用于区域震监测,结合地震仪可形成多分量观测系统,为地震学研究提供有效数据.
As a part of ground motion,the rotational component provides important additional constrains for signal processing,interior structure and source mechanism studies.However,the lack of high precision instrument limits related applications.Recently,the new developed fiber-optic gyroscope(FOG)is used a portable and inexpensive rotational seismometer.Wuhan National Geodetic Observatory deployed two FOGs and one three-components broadband seismometer on same base plate to continuously record seismic signals.This Love wave excited by the M;6.4 Yunnan Yangbi earthquake clear emerges on the records of this multiple-component seismometer.The apparent velocity and incident angle are obtained from comparison between the vertical rotation rate and the tangential acceleration records.The apparent velocities show clear dispersive and are in reasonable scale.The incident angle of the Love wave is close to the great-circle and the incident angle of the coda wave is more scattered.This study suggests that the collocated FOGs and seismometer can provides useful information for studies on interior structure and other aspects of seismology.
作者
操玉文
曾祥方
李正斌
王烁帆
包丰
谢军
李丽
李幼铭
CAO YuWen;ZENG XiangFang;LI ZhengBin;WANG ShuoFan;BAO Feng;XIE Jun;LI Li;LI YouMing(State Kay Laboratory of Advanced Optical Communication Systems and Networks,School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China;State Key Laboratory of Geodesy and Earth′s Dynamics,Innovation Academy for Precision Measurement Science and Technology,Wuhan 430077,China;Wuhan National Geodetic Observatory,Innovation Academy for Precision Measurement Science and Technology,Wuhan 430077,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;Key Laboratory of Petroleum Resource Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第2期663-672,共10页
Chinese Journal of Geophysics
基金
国家重点研发计划(2019YFC1509501,2016YFF0103400,2016YFF0103401)
国家自然科学基金(41974067)资助。
