GPS（Global Positioning System,全球定位系统）无线电掩星技术具有全球覆盖、垂直分辨率高等优点,为电离层的研究提供了十分丰富的资料。本论文的研究主要基于COSMIC（Constellation Observing System for Meteorology Ionosphere and...GPS（Global Positioning System,全球定位系统）无线电掩星技术具有全球覆盖、垂直分辨率高等优点,为电离层的研究提供了十分丰富的资料。本论文的研究主要基于COSMIC（Constellation Observing System for Meteorology Ionosphere and Climate）掩星电离层数据,详细介绍了电离层的基本理论;阐述利用掩星技术探测电离层的基本原理;针对COSMIC掩星数据分布特点,建立了数据分析和研究方法;展开更多
Along with intense rock strain and rock bursting processes at the late stage of earthquake preparation, mechanical-electrical energy conversion appears in the seismogenic region and its nearby rock formations, which c...Along with intense rock strain and rock bursting processes at the late stage of earthquake preparation, mechanical-electrical energy conversion appears in the seismogenic region and its nearby rock formations, which correspondingly stimulate certain electromagnetic effects. The paper mainly analyzes the pre-seismic electromagnetic effect of the ionosphere and proposes a method of monitoring VLF radio waves over the additional ionized region and so on. It is deemed that the method is of significance for short and imminent term prediction of strong earthquakes.展开更多
There is a good correlation between anomalous Schumann resonance and seismic activities. Pre-earthquake anomalous Schumann resonance is an important manifestation of LAIC (Lithosphere-Atmosphere-Ionosphere Coupling), ...There is a good correlation between anomalous Schumann resonance and seismic activities. Pre-earthquake anomalous Schumann resonance is an important manifestation of LAIC (Lithosphere-Atmosphere-Ionosphere Coupling), which is probably associated with seismic ionospheric disturbance. The observation system parameters of the Yunnan Schumann resonance monitoring stations and the results of statistical and seismic cases analysis are introduced in this paper. Three days before the March 10, 2011 MS5.8 Yingjiang earthquake, anomalous Schumann resonance in the By component (E-W) was observed by Yongsheng station, and two days before the Lincang MS4.0 earthquake of January 23, 2011, anomalous Schumann resonance in the By component was detected by the same station. Spectrum analysis results on the By component observations of Tonghai station show that strong disturbances were observed in spectral density corresponding to the first three Schumann resonant frequencies on the very day of the MS4.2 Honghe earthquake of May 22, 2011. Research shows that Schumann resonance monitoring is a feasible method for seismic-electromagnetic precursors monitoring.展开更多
The authors report the observation of Extremely Low Frequency （ELF） plasma turbulence registered by DEMETER satellite in the ionosphere over the seismic and thunderstorm areas. The detail analysis of the electric fi...The authors report the observation of Extremely Low Frequency （ELF） plasma turbulence registered by DEMETER satellite in the ionosphere over the seismic and thunderstorm areas. The detail analysis of the electric field fluctuations for the selected strong earthquakes and thunderstorm is presented. Special attention is given to study of the characteristics of the spectra of these variations and searches of the nonlinear effects. This analysis is possible in the time interval when the waveform has been transmitted. Some attempt of this discussion is given in the paper.展开更多
Here we report two cases of coseismic ionospheric disturbances observed through a GPS network in China after the great Wenchuan earthquake at 06：28 UT on 12 May, 2008. One is detected 7.9 rain after the earthquake an...Here we report two cases of coseismic ionospheric disturbances observed through a GPS network in China after the great Wenchuan earthquake at 06：28 UT on 12 May, 2008. One is detected 7.9 rain after the earthquake and had an intensive ＂N＂ shape oscillated waveform with a pronounced amplitude of about 1 TECU, which propagates approximately southward to the distance about 1000 km with the horizontal phase velocity of 600±84 m/s and the period of 9.5±1.3 min. The other is detected 8.5 min after the earthquake and has an oscillated waveform more like a positive pulse with an amplitude of about 0.5 TECU, which propagates eastward to the distance about 800 km with the horizontal phase velocity of 720＋59 m/s and the period of 7.4±0.8 min. These two coseismic ionospheric disturbances are caused by the acoustic gravity waves excited by partial trans-formation of the acoustic waves originated from the energy release of the earthquake, somewhere near the epicenter. The directional preferences of these two coseismic ionospheric disturbances may be associated with the oblique geomagnetic field lines and the background winds filtering effect.展开更多
文摘GPS（Global Positioning System,全球定位系统）无线电掩星技术具有全球覆盖、垂直分辨率高等优点,为电离层的研究提供了十分丰富的资料。本论文的研究主要基于COSMIC（Constellation Observing System for Meteorology Ionosphere and Climate）掩星电离层数据,详细介绍了电离层的基本理论;阐述利用掩星技术探测电离层的基本原理;针对COSMIC掩星数据分布特点,建立了数据分析和研究方法;
文摘Along with intense rock strain and rock bursting processes at the late stage of earthquake preparation, mechanical-electrical energy conversion appears in the seismogenic region and its nearby rock formations, which correspondingly stimulate certain electromagnetic effects. The paper mainly analyzes the pre-seismic electromagnetic effect of the ionosphere and proposes a method of monitoring VLF radio waves over the additional ionized region and so on. It is deemed that the method is of significance for short and imminent term prediction of strong earthquakes.
基金sponsored by the"Research on Earthquake and the Schumann Resonance Anomaly"(2010IES0202)sponsored by the"Geophysical Site Dynamic Magic and Strong Earthquake Precast Test"(2010008007)
文摘There is a good correlation between anomalous Schumann resonance and seismic activities. Pre-earthquake anomalous Schumann resonance is an important manifestation of LAIC (Lithosphere-Atmosphere-Ionosphere Coupling), which is probably associated with seismic ionospheric disturbance. The observation system parameters of the Yunnan Schumann resonance monitoring stations and the results of statistical and seismic cases analysis are introduced in this paper. Three days before the March 10, 2011 MS5.8 Yingjiang earthquake, anomalous Schumann resonance in the By component (E-W) was observed by Yongsheng station, and two days before the Lincang MS4.0 earthquake of January 23, 2011, anomalous Schumann resonance in the By component was detected by the same station. Spectrum analysis results on the By component observations of Tonghai station show that strong disturbances were observed in spectral density corresponding to the first three Schumann resonant frequencies on the very day of the MS4.2 Honghe earthquake of May 22, 2011. Research shows that Schumann resonance monitoring is a feasible method for seismic-electromagnetic precursors monitoring.
文摘The authors report the observation of Extremely Low Frequency （ELF） plasma turbulence registered by DEMETER satellite in the ionosphere over the seismic and thunderstorm areas. The detail analysis of the electric field fluctuations for the selected strong earthquakes and thunderstorm is presented. Special attention is given to study of the characteristics of the spectra of these variations and searches of the nonlinear effects. This analysis is possible in the time interval when the waveform has been transmitted. Some attempt of this discussion is given in the paper.
基金supported by the Chinese Academy of Sciences(Grant No.KZZDEW-01-2)the National Natural Science Foundation of China(Grant Nos.41274162,41131066,41304126)the National Basic Research Program of China(Grant No.2011CB811405)
文摘Here we report two cases of coseismic ionospheric disturbances observed through a GPS network in China after the great Wenchuan earthquake at 06：28 UT on 12 May, 2008. One is detected 7.9 rain after the earthquake and had an intensive ＂N＂ shape oscillated waveform with a pronounced amplitude of about 1 TECU, which propagates approximately southward to the distance about 1000 km with the horizontal phase velocity of 600±84 m/s and the period of 9.5±1.3 min. The other is detected 8.5 min after the earthquake and has an oscillated waveform more like a positive pulse with an amplitude of about 0.5 TECU, which propagates eastward to the distance about 800 km with the horizontal phase velocity of 720＋59 m/s and the period of 7.4±0.8 min. These two coseismic ionospheric disturbances are caused by the acoustic gravity waves excited by partial trans-formation of the acoustic waves originated from the energy release of the earthquake, somewhere near the epicenter. The directional preferences of these two coseismic ionospheric disturbances may be associated with the oblique geomagnetic field lines and the background winds filtering effect.
