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Title:: Detecting the free oscillations of the earth in the use of the observed data of Benxi artesian water temperature

作者:: 蒋翠荣¹; 任佳¹; 陈华静²; 王松²; 杨耀文³; 温超⁴; 王长江¹; (1.河北省地震局张家口中心台,河北张家口 075000; 2.中国地震局台网中心,北京 100036; 3.云南省地震局丽江地震台,云南丽江 674100; 4.河北省地震局,石家庄 050021)

Author(s):: JIANG Cui-rong¹; Ren Jia¹; CHENG Hua-jing²; WANG Song²; (1.Zhangjiakou Central Seismic Station,Earthquake Administration of Hebei Province,Zhangjiakou 075000,Heibei,China)(2.China Seismological Bureau Center,Beijing 100036,China)(3.Lijiang Seismic Station,Earthquake Administration of Yunnan Province, Lijiang 6

Keywords:: water temperature; Sumatra M9.0 earthquake; the Earth's free oscillations; the ball-type oscillation

摘要:: 用本溪自流井数字化水温观测资料,采用直接计算功率谱密度的方式对印尼苏门答腊9.0级大地震激发的球型自由振荡进行了提取,准确检测到了₀S₂～₀S₉低频基型球型振荡,并且还检测到了2个谐频球型振荡: ₁S₂、 ₁S₃。用该井数字化水温观测资料提取了₀S₂、 ₀S₃、 ₀S₄共3个振型的分裂,虽然3个振型均只得到2个单峰,但地球自由振荡谱线分裂现象的检测为研究地球的深内部结构提供了新的、不同类型的观测资料。研究表明,用本溪自流井数字化水温观测资料可以提取到苏门答腊大地震激发的地球球型振荡,这就为地球自由振荡的研究提供了一种新的观测手段。

Abstract:: In the first time of using digital observation data of Benxi artesian water temperature,as well as using direct calculation of power spectral density to extract the ball free oscillations prompted by the 9.0 Sumatra earthquake,and accurately detected ₀S₂～₀S₉ low-frequency base-type oscillations and two-frequency spherical harmonic oscillator: ₁S₂、 ₁S₃.By using the temperature observations,for the first time we successfully extracted 3 mode split: ₀S₂、 ₀S₃、 ₀S₄.Although only two single peaks were received by the three mode shapes,but the phenomenon of the Earth's free oscillations spectrum of split testing provides a new and different types of observational data to the study of internal structure of the Earth.Studies have shown that digital observation data of Benxi artesian water temperature is indeed to extract the the ball free oscillations prompted by the 9.0 Sumatra earthquake which prompted a new observational tool for the Earth's free oscillations study.