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《Chinese Journal of Geophysics》 2010-12
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The electromagnetic phenomena before the M_S8.0 Wenchuan earthquake

FAN Ying-Ying~1, DU Xue-Bin~(1*) , Jacques Zlotnicki~2, TAN Da-Cheng~1, LIU Jun~1,AN Zhang-Hui~1 , CHEN Jun-Ying~1 , ZHENG Guo-Lei~1 , XIE Tao~1 1 Lanzhou Institute of Seismology of China Earthquake Administration , Lanzhou 730000, China 2 UMR6525 CNRS-OPGC, 5 rue Kessler, 63038 Clermont-Ferrand, France  
We studied the changes of the geo-electric and geo-magnetic fields for the M_S 8. 0 Wenchuan earthquake of 2008 in Sichuan Province, China, and got the following understandings: (1) Significant anomalies of the geo-electric and geomagnetic fields, which included the self-potential changes, the increased Power Spectrum Density (PSD) of the geo-electric field and the waveform distortion of the geo-magnetic field diurnal variation, were recorded along the Northeastern edge of the Qinghai-Tibet Plateau before the M_S 8. 0 Wenchuan earthquake in 2008, and especially, the PSD anomalies of low frequency components with periods less than about 3 hours (T3h) of the geo-electric field increased by 3~4 orders of magnitude. It obviously shows the tectonic relevance between the great earthquake activity in the Qinghai-Tibet Plateau, the M_S 7. 3 Yutian earthquake in Sinkiang and the Wenchuan earthquake, and the geo-electromagnetic anomalies in a large spatial range. (2) In the range of about 500 km from the M_S 8. 0 Wenchuan earthquake, the PSD anomalies of mainly increased T3 h low frequency components of the geoelectric and geo-magnetic fields were recorded. In particular, at Chengdu station which was 35km from the earthquake the PSD anomaly of the geo-electric field was increased by 4 orders of magnitude, and yet, the anomalies appeared spatially non-uniformly and non-synchronously around the focal region and had some great differences in amplitude. The mechanism for the anomalies is studied, as a result, it can be understood that in the processes of the non-linear development of numerous micro cracks and their directional arrangement in the media of the focal region before the earthquake, such influencing factors as the underground water migration and the electro-mechanical transformation function and so on induced the geo-electromagnetic anomalies, and the focal process of the earthquake and the local media action under these geo-electromagnetic stations led to the spatially, temporally complicated evolution of the geo-electromagnetic anomalies.
【Fund】: 国家科技支撑计划课题所属专题(2008BAC35B01-8);; 中法先进研究计划(T06-03);; 国家科技支撑计划课题(2006BAC01B02-04-03)资助
【CateGory Index】: P315.72
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