泉州地震台M2166超宽频带地震仪记录的地球球型自由振荡信息研究-华南地震

文章信息/Info

Title:: Study on Spherical Earth Free Oscillation Recorded by M2166 very Broadband Seismograph in Quanzhou Seismic Station

作者:: 陈珊桦1; 全建军2; 蔡佩蕊3; 林加宝4; 张有明1; 罗开奇1; 1. 福建省地震局泉州基准地震台，福建泉州 362000；2. 福建省地震局永安地震台，福建永安 366000； 3. 福建省地震局莆田地震台，福建莆田 351100；4. 福建省地震局，福州 350003

Author(s):: CHEN Shanhua1; QUAN Jianjun2; CAI Peirui3; LIN Jiabao4; ZHANG Youming1; LUO Kaiqi1; 1.Quanzhou Basic Seismic Station，Fujian Earthquake Agency，Quanzhou 362000，China；2. Yongan Seismic Station, Fujian Earthquake Agency，Yongan 366000，China；3. Putian Seismic Station，Fujian Earthquake Agency，Putian 351100，China；4. Fujian Earthquake Agency，Fuzhou 350003，China

Keywords:: M2166 seismograph; Earth Free oscillation; Spherical oscillation; Power spectral density

摘要:: 利用泉州基准地震台M2166超宽频带地震仪记录的7个MS≥8.0地震震后5天数据资料，采用功率谱密度估计方法，提取到73个基频振型（0S4~0S76）和多个谐频振型，各振型频率点与地球初步参考模型（PREM）理论频率值符合较好，利用3套超宽频带地震仪数据对球型自由振荡信息能量分布差异进行探究，认为地球介质的横向不均匀性和各向异性是造成差异的主要原因。得到的结果可用于地球内部结构的研究，有助于做出更精细的地球模型。

Abstract:: By using the five days post-earthquake waveform data of seven earthquakes with MS≥8.0 which recorded by M2166 very broadband seismograph in Quanzhou seismic station. The 73 fundamental frequency modes（0S4~0S76）and many harmonic vibration modes were extracted by the power spectral density estimation method, it is found that the detected oscillation frequencies are in good agreement with the theoretical frequency of the PREM model. The difference of the energy distribution of free-oscillation information was studied by using three very broadband seismograph data, it is considered that the lateral heterogeneous or anisotropic media of the earth is the main cause of the difference. These free oscillation information can be used in the study of the earth’s internal structure and help to make a more detailed earth model.