|
|||||
|
|
| Study on the variation characteristics of the geoelectric field preceding earthquakes | |
| 作者姓名： | 马钦忠 冯志生 宋治平 赵卫国 |
| 作者单位： | Earthquake Administration of Shanghai，Shanghai 200062，China，Earthquake Administration of Jiangsu，Nanjing 210014，China，Earthquake Administration of Shanghai，Shanghai 200062，China，Earthquake Administration of Wenxian，Gansu，Wenxian 746400，China |
| 基金项目： | Chinese Joint Seismological Science Foundation (102080) and State Science and Technology Target Key Project (2001BA601B01-04-02) during theTenth Five-year Plan. |
| 摘 要： | Introduction Geoelectric field is one of the proper physical fields of the Earth. It is controlled by the vari-ous current systems originating outside of the Earth and the internal electrical structure of the Earth as well as the underground current origin. It carries a great amount of information coming from the Earths interior. At present, a lot of observations and studies about the geoelectric field have been made in the world. Many applications and studies of the geoelectric field in the… |
| 收稿时间： | 27 January 2003 |
| 修稿时间： | 22 September 2003 |
Study on the variation characteristics of the geoelectric field preceding earthquakes |
|
| Ma Qin-zhong , Feng Zhi-sheng , Song Zhi-ping and Zhao Wei-guo.Study on the variation characteristics of the geoelectric field preceding earthquakes[J].Acta Seismologica Sinica(English Edition),2004,17(3):334-343. | |
| Authors: | Ma Qin-zhong Feng Zhi-sheng Song Zhi-ping and Zhao Wei-guo |
| Institution: | 1. Earthquake Administration of Shanghai, Shanghai 200062, China 2. Earthquake Administration of Jiangsu, Nanjing 210014, China 3. Earthquake Administration of Wenxian, Gansu, Wenxian 746400, China |
| Abstract: | Earthquake events occurred in Nantong, Jiangsu Province on Nov. 3, and Dec. 25, 2001 in which the biggest mag-nitudes were ML=3.8 and ML=4.1, respectively. This paper firstly explains the principle of the eliminating noise method by the multi-dipole observation system of geoelectric field. Then based on the observation data of the multi-dipole observation system obtained by ZD9A telluric current monitors installed in Chongming and Nanjing stations, we study the abnormal variation of the geoelectric field preceding the earthquakes. The study shows that: a) Eliminating noise method of multi-dipole observation is an excellent method by which many kinds of geoelec-tric field noises can be eliminated successfully and the geoelectric precursor information can be recognized; b) The geoelectric precursor signals for the events were recorded on the NS and NE dipoles in Chongming station 42 days, 20 days and 2 days before the earthquakes respectively, in which the station is near the epicenter, and the longest time of persisting period was 9 days. The abnormal variation signals of geoelectric field observed in Nanjing sta-tion are all the noises but not the seismic electric signals, in which the station is not near the epicenter; c) Dipole distribution method of common electrode is not good in the multi-dipole observation system of the geoelectric field. |
| Keywords: | earthquake geoelectric field multi-dipole observation system eliminating noise method |
| 本文献已被 CNKI 万方数据 SpringerLink 等数据库收录！ | |