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Li Junhui 1 、 3 Li Qi 2 Yang Dongmei 2 1 Seismological Bureau of Anhui, Hefei, China.

Principal component analysis of geomagnetic data associated with Panzhihua Ms 6.1 earthquake - the preparatory result. Li Junhui 1 、 3 Li Qi 2 Yang Dongmei 2 1 Seismological Bureau of Anhui, Hefei, China. 2 Institutes of Geophysics, CEA, Beijing

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Li Junhui 1 、 3 Li Qi 2 Yang Dongmei 2 1 Seismological Bureau of Anhui, Hefei, China.

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  1. Principal component analysis of geomagnetic data associated with Panzhihua Ms 6.1 earthquake- the preparatory result Li Junhui1、3 Li Qi2 Yang Dongmei2 1 Seismological Bureau of Anhui, Hefei, China. 2 Institutes of Geophysics, CEA, Beijing 3、National Geophysical Observatory at Mengcheng，Hefei 230031 e-mail：lijunhui@mail.ustc.edu.cn

  2. Table of contents • Ms 6.1 Pan Zhihua earthquake and observations site. • PCA method • PCA result of this earthquake • Discussion and conclusion

  3. 一、 about this earthquake Wenchuan earthquake sequence Ms 6.1 About 600Km far from Ms 8.0

  4. Stations and Earthquake • 西昌台阵9个磁通门仪器。 • 8月30日16点发生Ms6.1级地震。 • 距最近的台站平地仅6.4Km、南山40Km、会理60Km. • 仪器：GM4

  5. ULF geomagnetic data Components Geomagnetic 3 component （H, D[declination], Z[vertical]） Observatory Nanshan HUILi Pingdi Sampling 1Hz Analysisterm Jan 1 2008– Dec 31 2008 Feb march April No data Technical parameter of GM4

  6. 二、procedure of PCA • Data: second; • Stations: NSH、HLC、Pd; • 1800 point; • Y1=Dnsh(i); • Y2=Dhlc(i); • Y3=Dpd(i); • Y=[Y1,Y2,Y3];

  7. procedure of PCA • 1Hz sample per 30 min 3 stations yNS(1:1800) ,yPD(1:1800),yHL(1:1800). • Y=[yNST, yPDT yHLT]; Transpose matrix • variance matrix R=YYT ; • Calculate the eigenvalue of R 入1，入2，入3 （入1>入2>入3 ）. 3 temproal eigenvalue sequence

  8. Signals observed on the ground-based magnetometer Katsumi Hattori 2004

  9. Result of PCA Japan

  10. 三、 PCA result

  11. The variation of first principal component with that of Ap index in April, 2008.

  12. The variation of first principal component

  13. The variation of second principal component

  14. The variation of third principal component

  15. analysis of the third principal component • 选取台站周围100Km范围内地震。 • 计算地震释放能量 • 与第三主成分对比分析。

  16. The variation of third principal component 2008

  17. Select May to September

  18. 四 Discussion and conclusion • The first principal component is found to be the signal originated in the solar–terrestrial effects such as geomagnetic pulsation. • the second principal component, the local artificial noise is included. • the smallest third component in the local midnight at the Panzhuhua region, it indicated increase in the third eigenvalue about 40 days before the large earthquake. • These features are likely to be correlated with large earthquake.

  19. Thanks all

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