地震地磁观测与研究2025，Vol.46Issue(2)：100-106,7.DOI:10.3969/j.issn.1003-3246.2025.02.011
基于重力观测数据检测地球自由振荡
Detecting the Earth's free oscillation by using the observations of gravity at Yunlong and Zhaotong seismic stations
摘要
Abstract
Using the observation data of the gPhone gravimeter at Yunlong Seismic Station and the GS-15 gravimeter at Zhaotong Seismic Station,this study detects the Earth's free oscillation induced by the MS 8.1 earthquake that occurred in the sea area south of Alaska on July 29,2021,using the power spectrum density estimation method,and compares with the theoretical values of the Preliminary Reference Model of the Earth(PREM).The results show that the deviations of the free oscillation fundamental frequency of 0S5-0S50 at the two stations and the PREM model are within 0.05%.However,there are also differences between the two stations in different frequency bands.The deviation of the Zhaotong GS-15 gravimeter is smaller in the(1.8-4.5)mHz frequency band,and the Yunlong gPhone gravimeter detects more vibration modes in the(4.5-5.6)mHz frequency band.The test results can provide a reference for the data analysis of the two gravimeters.关键词
gPhone重力仪/GS-15重力仪/功率谱密度/地球自由振荡/PREM模型Key words
gPhone gravimeter/GS-15 gravimeter/power spectral density/spherical earth free oscillation/PREM model引用本文复制引用
熊家伟,张源,杨海鹏,杨树峰,番绍辉..基于重力观测数据检测地球自由振荡[J].地震地磁观测与研究,2025,46(2):100-106,7.基金项目
云南省青年地震科学基金(项目编号:2024K11) （项目编号:2024K11）
