The diurnal variation of geo-electric field along the longitude and latitude chains in China mainland
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摘要: 本文应用中国大陆两条经度链和两条纬度链上共37个地电场台站的观测数据,研究了地电场日变化的时/频域特征,结果认为,绝大多数台站的日变化表现为两次起伏的半日波,紧临午前午后出现;按FFT振幅谱由大到小,其主要周期成分依次为12.4/12、8、24 h等,与潮汐调和分量周期一致;纬度效应主要表现为沿经度链的日变化幅度与纬度高/低有关,日变化相位差与当地时差吻合;Loyd季节的J季节日变化幅度最大、E季节其次、D季节最小.讨论了产生日变化主要周期成分的可能原因,认为月日引潮力引起的地面涡旋电流强度变化和太阳风引起的空间电磁活动共同产生了地电日变化的半日波周期成分.Abstract: This paper has studied the time and frequency characteristics of the geo-electric field diurnal variation along the two longitude chains and the two latitude chains, using the data of the geo-electric field observed at the 37 stations along the chains. Accordingly, the following significant results are obtained: the variation appears mainly as semi-diurnal waves twice a day at most of the stations, approximately before and after the noon; according to the big to small order of the FFT amplitude spectrums, the main periods of the diurnal variation are 12.4 h/12 h, 8 h, 24 h, etc, which are in accordance with the periods of the tidal harmonic components; the latitude effect on diurnal variation is manifested by the amplitude changing with latitude along a longitude chain, and the longitude effect is shown as phase difference consistent with the local-time difference between the stations at the same latitude. Furthermore, the amplitude of the diurnal variation is related with the Loyd season, which reduces orderly in J-, E-and D-seasons. The possible reasons for the main periodic components of the diurnal variation have been discussed, as a result, it is believed that the variation of the ground eddy current intensity caused by lunisolar tidal forces and the space electromagnetic activity aroused by the solar wind jointly produce the semi-diurnal period components of the geo-electric diurnal variation.
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Key words:
- Geoelectric field /
- Diurnal variation /
- Period /
- FFT /
- Tide
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[1] 克拉耶夫. 地电原理. 张可迁, 陈培光, 张志诚等译. 北京: 地质出版社, 1954: 100-236. А П КPAEB. Geoelectrics Principle (in Chinese). Zhang K Q, Chen P G, Zhang Z C, et al. Trans. Beijing: Geological Publishing House, 1954: 100-236.
[2] Lanzerotti L J, Sayres D S, Medford L V, et al. Response of large-scale geoelectric fields to identified interplanetary disturbances and the equatorial ring current. Adv. Space Res., 2000, 26(1): 21-26.
[3] Pirjola R. Effects of space weather on high-latitude ground systems. Adv. Space Res., 2005, 36(12): 2231-2240.
[4] Burns G B, Hesse M H, Parcell S K, et al. The geoelectric field at Davis station, Antarctica. Journal of Atmospheric and Terrestrial Physics, 1995, 57(14): 1783-1797.
[5] Corney R C, Burns G B, Michael K, et al. The influence of polar-cap convection on the geoelectric field at Vostok, Antarctica. Journal of Atmospheric and Solar-Terrestrial Physics, 2003, 65(3): 345-354.
[6] 傅承义, 陈运泰, 祁贵仲. 地球物理学基础. 北京: 科学出版社, 1985: 203-254. Fu C Y, Chen Y T, Qi G Z. Geophysical Fundamentals (in Chinese). Beijing: Science Press, 1985: 203-254.
[7] 孙正江, 王华俊. 地电概论. 北京: 地震出版社, 1990: 3-95. Sun Z J, Wang H J. Introduction of Geoelectricity (in Chinese). Beijing: Seismological Press, 1990: 3-95.
[8] 李金铭. 地电场与电法勘探. 北京: 地质出版社, 2005: 36-59. Li J M. Geoelectric Field and Electrical Exploration (in Chinese). Beijing: Geological Publishing House, 2005: 36-59.
[9] Uyeda S. Introduction to the VAN Method of Earthquake Prediction. Singapore: World Scientific Publishing Co., 1995: 3-28.
[10] Varotsos P, Alexopoulos K. Physical properties of the variation of the electric field of the earth preceding earthquake. Tectonophysics, 1984, 110(1-2): 73-98.
[11] Zlotnicki J, Kossobokov V, Le Moul J L. Frequency spectral properties of an ULF electromagnetic signal around the 21 July 1995, M=5.7, Yong Deng (China) earthquake. Tectonophysics, 2001, 334(3-4): 259-270.
[12] 李宁, 杜学彬, 谭大诚等. 松山观测台地震短临电磁现象. 地震, 2007, 27(增刊): 103-111. Li N, Du X B, Tan D C, et al. Imminent electro-magnetic phenomenon related to earthquakes recorded at the Songshan Station. Earthquake (in Chinese), 2007, 27(Supple): 103-111.
[13] 范莹莹, 杜学彬, Zlotnicki J等. 汶川Ms8.0大震前的电磁现象. 地球物理学报, 2010, 53(12): 2887-2898. Fan Y Y, Du X B, Zlotnicki J, et al. The electromagnetic phenomena before the Ms8.0 Wenchuan Earthquake. Chinese J. Geophys. (in Chinese) 2010, 53(6): 2887-2898.
[14] 刘君, 杜学彬, Zlotnicki J等. 几次大震前的地面和空间电磁场变化. 地球物理学报, 2010, 54(11): 2885-2897. Liu J, Du X B, Zlotnicki J, et al. The changes of the ground and ionosphere electric/magnetic fields before several great earthquakes. Chinese J. Geophys. (in Chinese), 2010, 54(11): 2885-2897.
[15] 汤吉, 詹艳, 王立凤等. 5月12日汶川8.0级地震强余震观测的电磁同震效应. 地震地质,2008, 30(3): 739-745. Tang J, Zhan Y, Wang L F, et al. Coseismic signal associated with aftershock of the Ms8.0 Wenchuan Earthquake. Seismology and Geololgy (in Chinese), 2008, 30(3): 739-745.
[16] 黄清华, 刘涛. 新岛台地电场的潮汐响应与地震. 地球物理学报, 2006, 49(6): 1745-1754. Huang Q H, Liu T. Earthquakes and tide response of geoelectric potential field at the Niijima station. Chinese J. Geophys. (in Chinese), 2006, 49(6): 1745-1754.
[17] 郝锦绮, 钱书清, 高金田等. 岩石破裂过程中的超低频电磁异常. 地震学报, 2003, 25(1): 102-111. Hao J Q, Qian S Q, Gao J T, et al. ULF electric and magnetic anomalies accompanying the cracking of rock sample. Acta Seismologica Sinica (in Chinese), 2003, 25(1): 102-111.
[18] 钱书清, 吕智, 任克新. 地震电磁辐射前兆不同步现象物理机制的实验研究. 地震学报, 1998, 20(5): 535-540. Qian S Q, Lü Z, Ren K X. Experimental study on the mechanism of non-synchronism of seismo-electromagnetic radiation precursors. Acta Seismologica Sinica (in Chinese), 1998, 20(5): 535-540.
[19] 钱家栋, 顾左文, 赵家骝等. 地震台站观测环境技术要求.第2部分: 电磁观测 (GB/T 195312-2004). 北京: 地震出版社, 2004. Qian J D, Guo Z W, Zhao J L, et al. Technical Requirement for Observational Environment of Seismic. Stations-Part 2: Electromagnetic Observation (GB/T 19531.2-2004) (in Chinese). Beijing: Seismological Press, 2004.
[20] 杜学彬, 席继楼, 谭大诚等.地震台站建设规范 地电台站 第2部分: 地电场台站 (DB/T 18.2-2006). 北京: 地震出版社, 2004. Du X B, Xi J L, Tan D C, et al. Specification for the Construction of Seismic Station Geoelectrical Station Part 2: Geoelectrical Field Observatory (DB/T 18.2-2006) (in Chinese). Beijing: Seismological Press, 2006.
[21] 杜学彬, 叶青, 赵杰等. 地电场日变化研究. 地震, 2007, 27(增刊): 121-130. Du X B, Ye Q, Zhao J, et al. Study on geoelectric field daily variation. Earthquake (in Chinese), 2007, 27(Supple): 121-130.
[22] 叶青, 杜学彬, 周克昌等. 大地电场变化的频谱特征. 地震学报, 2007, 29(4): 382-390. Ye Q, Du X B, Zhou K C, et al. Spectrum characteristics of geoelectric field variation. Acta Seismologica Sinica (in Chinese), 2007, 29(4): 382-390.
[23] 谭大诚, 王兰炜, 赵家骝等. 潮汐地电场谐波和各向波形的影响要素. 地球物理学报, 2011, 54(7): 1842-1853. Tan D C, Wang L W, Zhao J L, et al. Influence factors of harmonic waves and directional waveforms of tidal geoelectrical field. Chinese J. Geophys. (in Chinese), 2011, 54(7): 1842-1853.
[24] 徐文耀. 地磁学. 北京: 地震出版社, 2003: 221-349. Xu W Y. Geomagnetism (in Chinese). Beijing: Seismological Press, 2003: 221-349.
[25] Negi J G, Saraf P D. Anisotropy in Geoelectromagnetism. Elsevier Science Publishing Company, 1989: 1-88, 175-232.
[26] 杜学彬, 李宁, 叶青等. 强地震附近视电阻率各向异性变化的原因. 地球物理学报, 2007, 50(6): 1802-1810. Du X B, Li N, Ye Q, et al. A possible reason for the anisotropic changes in apparent resistivity near the focal region of strong earthquake. Chinese J. Geophys. (in Chinese), 2007, 50(6): 1802-1810.
[27] 赵旭东, 杜爱民, 徐文耀等. Sq电流系午前午后不对称性现象的来源. 地球物理学报, 2008, 51(3): 643-649. Zhao X D, Du A M, Xu W Y, et al. The origin of the prenoon-postnoon asymmetry for Sq current system. Chinese J. Geophys. (in Chinese), 2008, 51(3): 643-649.
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