泉州台重力仪和超宽频带地震仪记录的球型自由振荡信息对比  

Comparison of Spherical Earth Free Oscillation Recorded by Gravimeter and Ultra Broadband Seismometer in Quanzhou Station

作　　者：陈珊桦[1] 蔡佩蕊[2] 全建军[3] 尤宇星[1] 黄圣棕[1] CHEN Shanhua;CAI Peirui;QUAN Jianjun;YOU Yuxing;HUANG Shengzong(Quanzhou Basic Seismic Station,Fujian Earthquake Agency,Quanzhou 362000,China;Putian Seismic Station,Fujian Earthquake Agency,Putian 351100,China;Yongan Seismic Station,Fujian Earthquake Agency,Yongan 366000,China)

机构地区：[1]福建省地震局泉州基准地震台,福建泉州362000 [2]福建省地震局莆田地震台,福建莆田351100 [3]福建省地震局永安地震台,福建永安366000

出　　处：《华北地震科学》2022年第4期88-94,共7页North China Earthquake Sciences

基　　金：2020年中国地震局监测、预报、科研三结合课题(3JH-202001045)。

摘　　要：选用泉州台g-Phone重力仪和同址观测的M2166超宽频带地震仪的观测数据,分别提取2018年8月19日斐济群岛M_(S)8.1地震(深源地震)和2016年11月13日新西兰MS8.0地震(浅源地震)的球型自由振荡信息。分析结果显示,观测值与PREM模型的理论值吻合较好,认为个别偏差的存在既有地球介质横向不均匀性的因素,也与仪器在低频段的特性有关;同时对深源地震在谐频振型记录上较浅源地震更为清晰、但大于_(0)S_(40)的振型记录却较差的情况进行讨论。In this contribution,we calculated the Earth’s free oscillation stimulated by two earthquakes:the deepsource earthquake of level M_(S)8.1 occurring in Fiji Islands on August 19,2018,and the shallow-source earthquake of level M_(S)8.0 taking place in New Zealand on November 13,2016.The information of the two earthquakes was recorded by the g-Phone gravimeter and the M2166 ultra broadband seismometer from Quanzhou Station.The results are shown to match the theoretical values quite well.The slight deviations are mostly likely resulted from both the Earth’s lateral heterogeneity and the characteristics of the instrument in the low frequency range.At the same time,it is demonstrated that the harmonic frequency is recorded more clearly for deep-source earthquakes than it is for shallow-source earthquakes;and vice versa for the record of mode shape greater than _(0)S_(40).

关 键 词：g-Phone重力仪 M2166超宽频带地震仪 球型自由振荡 深源地震 

分 类 号：P315.72[天文地球—地震学]