摘要
gPhone重力仪低频段良好的噪声水平有利于记录地球自由振荡信息。利用泉州基准地震台gPhone重力仪原始观测数据,分析直接检测2021年7月29日美国阿拉斯加州以南海域M_(S) 8.1地震激发的地球自由振荡信息的可能性,结果表明,基频振型_(0)S_(4)—_(0)S_(60)和多个谐频振型的实测频率值与地球初步参考模型(PREM)的理论值基本一致,可见利用该台gPhone重力仪可有效检测地球自由振荡信号。文中所得结果可用于地球内部结构研究,有助于做出更精细的地球模型。
The gPhone gravimeter at Quanzhou Seismic Station has good noise level in the low frequency band which is conducive to the recording of the earth’s free oscillation.This study uses the original observation data at the station to detect the earth’s free oscillations of the MS 8.1 earthquake occurred in the sea area south of Alaska on July 29,2021.The results show that the observed periods coincide well with the theoretical values calculated by the PREM model.The gPhone gravimeter at Quanzhou Seismic Station can effectively detect the earth’s free oscillations.The results obtained in this paper can be used to study the internal structure of the earth and help to make a more refined earth model.
作者
陈珊桦
蔡佩蕊
陈新兴
林立峰
CHEN Shanhua;CAI Peirui;CHEN Xinxing;LIN Lifeng(Quanzhou Basic Seismic Station,Fujian Earthquake Agency,Fujian Province 362000,China;Putian Seismic Station,Fujian Earthquake Agency,Fujian Province 351100,China;Xiamen Seismic Station,Fujian Earthquake Agency,Fujian Province 361000,China)
出处
《地震地磁观测与研究》
2022年第2期97-103,共7页
Seismological and Geomagnetic Observation and Research
基金
2020年中国地震局监测、预报、科研三结合课题(项目编号:3JH-202001045)。
关键词
球型自由振荡
gPhone重力仪
功率谱密度
spherical earth free oscillation
gPhone gravimeter
power spectral density
