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On the Relative Effect of Magnitude and Depth of Earthquakes in the Generation of Seismo-Ionospheric Perturbations at Middle Latitudes as Based on the Analysis of subionospheric Propagation Data of JJY (40 kHz)-Kamchatka Path

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Open Journal of Earthquake Research 2013年第2期2卷 27-31页

作者： Masashi Hayakaw Alexander Rozhnoi Maria Solovieva Advanced Wireless Communications Research Center University of Electro-Communications (UEC) Tokyo Japan Hayakawa Institute of Seismo Electromagnetics Co. Ltd. UEC Incubation Centre Tokyo Japan Institute of Physics of the Earth Russian Academy of Sciences Moscow Russia nstitute of Physics of the Earth Russian Academy of Sciences Moscow Russia

The relative importance of magnitude and depth of an earthquake (EQ) in the generation of seismo-ionospheric perturbations at middle latitudes is investigated by using the EQs near the propagation path from the Japanese LF transmitter, JJY (at Fukushima) to a receiving station at Petropavsk-Kamchatsky (PTK) in Russia during a three-year period of 2005-2007. It is then found that the depth (down to 100km) is an extremely unimportant factor as compared with the magnitude in inducing seismo-ionospheric perturbations at middle latitudes. This result for sea EQs in the Izu-Bonin and Kurile-Kamchatka arcs is found to be in sharp contrast with our previous result for Japanese EQs mainly of the fault-type. We try to interpret this difference in the context of the lithosphere-atmosphere-ionosphere coupling mechanism.

关键词： VLF/LF subionospheric Propagation Ionospheric Perturbation Earthquake precursors Earthquake Prediction

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Study of the ionospheric TEC using GPS during the large solar flare burst on Nov. 6,1997

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Chinese Science Bulletin 2000年第19期45卷 1749-1752页

作者： Donghe Zhang Zuo Xiao Peking Univ Dept Geophys Beijing 100871 Peoples R China

Using the data from 15 global positioning system (GPS) stations scattered between 28° N-45° N and 90° W- 77° E we obtained the total electron content (TEC) variations with time during a large solar flare. The results indicated that the flare makes the TEC of ionosphere increasing in a large spatial area. The amounts of the TEC enhancement are mainly determined by the local time of subionospheric point, and the largest TEC enhancement is about 2.5 TECU. It is also concluded that the TEC enhancement is not symmetrical about the local noon time, the TEC enhancement values during morning hours are larger than those of the afternoon hours.

关键词： total electron content (TEC) flare subionospheric point.

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