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| 引用本文： | 张建国,姚丽,刘晓灿,马新欣,焦立果.��������VLF��ų�Ƶ�������о�[J].大地测量与地球动力学,2012,32(3):110-115. |
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| 作者姓名： | 张建国 姚丽 刘晓灿 马新欣 焦立果 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院,合肥 230026;河北省地震局邯郸中心台,邯郸 056001
2. 中国地震局地球物理研究所,北京,100081 |
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| 基金项目： | 河北省地震局重点项目，中央级公益性科研院所基本科研业务专项，国家科技支撑项目 |
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| 摘 要： | ??2006??3???2009??2??DEMETER????VLF????????????????????????????????????????????????50~300 Hz?????????Ч?????????Σ??????????λ???????????????????????????????????????λ???????????????????????о??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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| 关 键 词： | DEMETER?????? ????? VLF??????? ????????? ?????? |
RESEARCH ON FREQUENCY SPECTRUM CHARACTERISTICS OF VLF ELECTROMAGNETIC FIELD IN EARTHQUAKE IONOSPHERE |
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| Zhang Jianguo
,
Yao Li
,
Liu Xiaocan
,
Ma Xinxin
,
Jiao Liguo.RESEARCH ON FREQUENCY SPECTRUM CHARACTERISTICS OF VLF ELECTROMAGNETIC FIELD IN EARTHQUAKE IONOSPHERE[J].Journal of Geodesy and Geodynamics,2012,32(3):110-115. |
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| Authors: | Zhang Jianguo Yao Li Liu Xiaocan Ma Xinxin Jiao Liguo |
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| Institution: | 1)School of Earth Space Sciences,University of Science and Technology of China,Heifei 2300262)Central Seismostation of Handan,Handan 0560013)Institute of Geophysics,CEA,Beijing 100081 |
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| Abstract: | By analyzing the electromagnetic spectrum data observed by DEMETER satellite during the time interval between March 2006 and February 2009,it is found that the characteristics of electric field power spectrum of global ionosphere in DEMETER altitude are as follows:the 50-300 Hz frequency band about earthquake ionospheric effect are the dominant frequency the closer,the distance to seismic spatial position,the more significant seismic anomaly;indifferent hemispheres of the earthquake,abnormal azimuthal direction is different.The studies on the events in northern hemisphere in geomagnetic summer show that the anomaly corresponding marine quakes occured in geomagnetic summer the frequency spectrum anomaly of geomagnetic field basically were positive and these land negative and corresponding the quakes in different hemisphere were significantly different:these in the northern hemisphere were positive and meridional,and negative anomaly of north but negative anomaly opposite in the southern hemisphere,the negative anomaly were northeast and positive ones southwest. |
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| Keywords: | observations of DEMETER satellite ionosphere VLF electric field frequency spectrum global abnormal characterstics geomagnetic summer |
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