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自由振荡与 地球及类地天体内部大尺度非均匀结构研究 - PowerPoint PPT Presentation


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http://seminar.kl-edi.ac.cn. 欢迎参加 第 47 次地球深部学术沙龙 !. 自由振荡与 地球及类地天体内部大尺度非均匀结构研究. 李小凡 研究员. 2013-09-27. 地球:“巨无霸钟”. …… 陶然亭的芦花,钓鱼台的柳影,西山的虫唱, 玉泉的夜月, 潭柘寺的钟声 …… —— 故都的秋,郁达夫. 自由振荡的每一个本征频率对应一种 驻波 (standing wave). 振荡的类型. 球型振荡( Spheroidal mode )

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http://seminar.kl-edi.ac.cn

欢迎参加第47次地球深部学术沙龙!

自由振荡与地球及类地天体内部大尺度非均匀结构研究

李小凡 研究员

2013-09-27


地球:“巨无霸钟”

…… 陶然亭的芦花,钓鱼台的柳影,西山的虫唱,

玉泉的夜月,潭柘寺的钟声……

——故都的秋,郁达夫



振荡的类型

  • 球型振荡(Spheroidal mode)

    Motions are parallel to the radial direction. Sensitive to gravity, or density. nSl

  • 环型振荡(Toroidal mode)质点只在同心球面上运动,位移无径向分量nTl


0S2

Period = 54 min

0S1

Period = 41 min

0S3

Period = 36 min

0T1

Period = 13 min

0T2

Period = 44 min

0T3

Period = 28 min

http://icb.u-bourgogne.fr/nano/manapi/saviot/terre/index.en.html


Spheroidal oscillation 6S4

Spheroidal mode: 30S12

Courtesy of Harvard Seismology


2011 tohoku
2011,Tohoku 地震后记录到的自由振荡信号

0S5

0S9

0S3

0S4

PAB台(位于西班牙)记录信号

MAKZ台(Kazakhstan)记录到的信号

地球结构的约束,如PREM(1000多个 normal mode周期)

对震源的约束


http://seminar.kl-edi.ac.cn

欢迎参加第47次地球深部学术沙龙!

自由振荡与地球及类地天体内部大尺度非均匀结构研究

李小凡 研究员


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