| A possible UL Fseismice lectro-magnetic emission |
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| 作者姓名： | 李兴才 曹惠馨 俞铁宏 |
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| 作者单位： | Xing-Cai LI;Hui-Xin CAO;Tie-Hong YU; and Zhi-YongCHEN; (Institute of Geophysics，State Seismological Bureau，Beijing 100081，China)(Seismological Bureau of Langfang，Langfang 102800，Hebei Province，China) |
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| 摘 要： | ＡｐｏｓｓｉｂｌｅＵＬＦｓｅｉｓｍｉｃｅｌｅｃｔｒｏ－ｍａｇｎｅｔｉｃｅｍｉｓｓｉｏｎＸｉｎｇ－ＣａｉＬＩ；（李兴才）Ｈｕｉ－ＸｉｎＣＡＯ；（曹惠馨）Ｔｉｅ－ＨｏｎｇＹＵ；（俞铁宏）ａｎｄＺｈｉ－ＹｏｎｇＣＨＥＮ；（＠２陈智勇）（Ｉｎｓｔｉｔｕｔｅｏ...
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| 收稿时间： | 23 February 1994 |
| 修稿时间： | 29 August 1994 |
A possible ULF seismic electro-magnetic emission |
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| Xing-Cai Li, Hui-Xin Cao, Tie-Hong Yu and Zhi-Yong Chen.A possible UL Fseismice lectro-magnetic emission[J].Acta Seismologica Sinica(English Edition),1995,8(3):463-471. |
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| Authors: | Xing-Cai Li Hui-Xin Cao Tie-Hong Yu and Zhi-Yong Chen |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(2) Seismological Bureau of Langfang, 102800 Langfang, Hebei Province, China |
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| Abstract: | A possible electro-magnetic emission (EME) associated with earthquakes are presented in the paper through analysis of the
anomaly EME in ultra-low frequency range (ULF) observed at some sites before two earthquakes near Beijing and the comparison
with similar signals observed prior to the 1988 Armenia and 1989 Loma Prieta earthquakes. The anomaly features are as follows:
(1) the anomalous disturbances occur discontinuously several days before earthquakes and signal frequencies are higher remarkably
than geomagnetic pulsation and magnetic disturbances during magnetic storms in ULF band and at least not lower than 1 Hz;
(2) similar signals are observed by similar observation systems at same site for the same earthquake; (3) the anomaly occurrence
times and frequencies at sites near the epicenter are earlier and higher respectively than that at farther sites; (4) the
signal energy distribution in different frequency ranges may not be the same and the signal magnitudes may be related to earthquake
magnitudes and greater earthquake may emit stronger EME signals; (5) there may be a seismic magnitude threshold for observable
ULF EME anomalies and if smaller earthquakes possess of EME signals also, they may not be observed by the present observation
system.
Contribution No. 95A0062, Institute of Geophysics, SSB, China.
Funded by the “8th Five-Year Plan” of State Seismological Bureau, contract code 85-907-03-02-05. |
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| Keywords: | electro-magnetic emission short-impeding Prediction ULF frequency band |
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